Hybrid hot water supply method, system, program, recording medium, hybrid control unit, and remote control unit

Abstract

To determine a boiling-up temperature capable of minimizing running cost by accumulating operation history acquired in a constant lapsed time from start of an operation and enable automatic change to the boiling-up temperature.SOLUTION: A hybrid hot water supply method includes steps of: boiling up lower layer water in a hot water storage unit to obtain hot water with a predetermined temperature by using first hot water supply means and storing the hot water; during delivery of the hot water, boiling up intermediate layer water in the hot water storage unit to a predetermined temperature by using second hot water supply means for storage, complementing shortage heat quantity by using the second hot water supply means and delivering the hot water; acquiring information indicating a manual change-over mode or an automatic change-over mode; acquiring operation information on the first hot water supply means and the second hot water supply means; acquiring information indicating running cost calculated with respect to each different boiling-up temperature by using the operation information in a fixed period; selecting a boiling-up temperature enabling a minimum value of the running cost or a value near the minimum value; and changing over the boiling-up temperature by using the boiling-up temperature in the manual change-over mode or the automatic change-over mode.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a control technology for hybrid water heating that combines, for example, a heat pump unit (hereinafter referred to as "HP unit") and a gas water heater as a hot water supply heat source and uses a hot water storage unit for heat storage.

Background Art

[0002] Conventionally, a hybrid water heating system has been put into practical use, which uses a water heating means using an HP unit as a heat source, a water heating means using the combustion heat of fuel gas as a heat source, and a hot water storage unit for heat storage.

[0003] Regarding this hybrid water heating system, based on past operation history, a plurality of scheduled usage times on the day are estimated, predicted temperature information indicating the predicted temperature at the scheduled usage time is acquired, and either one of the boiling-up set temperature and the boiling-up set amount is corrected according to the difference between the predicted temperature indicated by the predicted temperature information and the reference temperature, and either one or both of the boiling-up set temperature or the boiling-up set amount that conforms to the hot water supply demand are set (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, in a hybrid water heating system, electric power and fuel gas with different energy costs are used as heat sources, and the excellent functions of a gas water heater and the excellent functions of an HP unit not available in a gas water heater are used in combination to take advantage of both and reduce running costs. The gas water heater has advantages such as being able to supply hot water at a high temperature, and the HP unit has advantages such as high operating efficiency by continuously supplying hot water at a low temperature. In a conventional hybrid water heating system, the operating efficiency of the HP unit is good at boiling up to a low temperature, storing this in a hot water storage unit and supplying hot water from this hot water storage unit. When the amount of hot water supplied from this hot water storage unit is insufficient, the shortage is supplemented by heating with a gas water heater. However, it has been pointed out that there is a problem that the running cost deteriorates due to, for example, an increase in the operating rate of the gas water heater or an increase in the downtime of the HP unit depending on the hot water supply for a certain period of time.

[0006] For example, compare a store such as a restaurant where the daily hot water supply demand is 5,000 liters and there is always a hot water supply demand throughout the day, and a store such as a restaurant where there is an intermittent hot water supply demand. Fig. 18 shows a time-by-time hot water supply demand ratio pattern with the time on the horizontal axis and the hot water supply demand ratio (%) on the vertical axis. However, the hot water supply demand for one day (24 hours) is taken as 100%. In this case, in store A, there is always a large hot water supply demand, whereas in store B, the hot water supply demand time is short. That is, in store A, since the operating time of the HP unit is long, if the boiling temperature is set to 65°C, the cost can be reduced.

[0007] On the other hand, in store B, the hot water supply stop time is long, the hot water storage unit is in a so-called full storage state, and the operating stop time of the HP unit is long. In this case, if the boiling temperature is set to 85°C, since the operating time of the HP unit becomes long, the cost can be reduced compared to the case where the boiling temperature is set to 65°C. The power consumption (electricity cost) of the HP unit depends on the operating time, boiling temperature, efficiency, etc. of the HP unit, and the gas consumption (gas cost) of the gas water heater depends on the operating time, hot water supply set temperature, water supply temperature, etc. Therefore, it can be said that reducing the running cost lies in optimizing the ratio of the power consumption of the HP unit and the gas consumption of the gas water heater required to supply the hot water volume. And the electricity cost of the HP unit is affected by variable factors such as the efficiency of the HP unit, its boiling temperature (heat storage temperature), hot water demand and its fluctuations, and the outside air temperature according to the season. Furthermore, the efficiency and capacity of the HP unit are affected by the water supply temperature. The gas cost of the gas water heater is also affected by variable factors such as hot water demand and its fluctuations, and the outside air temperature.

[0008] Regarding such problems, even if a system is constructed to automatically switch the boiling temperature of the HP unit based on past operation records, at the beginning when this system is installed, there is naturally no past operation information. For this reason, the boiling temperature and running cost have to set assumed values (default values), and even if a certain amount of operation records are obtained, it is necessary for the user to judge which value should be switched at which point in time. In a system premised on such human intervention, even if it is equipped with excellent control functions, it is unreasonable for the user operation to become complicated, and there is a disadvantage of causing waste in power consumption and gas usage.

[0009] Regarding such problems, the inventor has obtained the knowledge that even if the operation starts at an arbitrary boiling temperature at the beginning of installation, it is reasonable to obtain the boiling temperature that can reduce or minimize the running cost using the operation records accumulated over a certain period of time and switch to this boiling temperature. Therefore, based on the above problems and knowledge, an object of the present disclosure is to obtain the boiling temperature that can minimize the running cost by accumulating the operation records obtained after a certain elapsed time from the start of operation, and to realize the automatic switching to this boiling temperature. Another object of the present disclosure is to increase the degree of freedom in switching the boiling temperature by selecting the manual switching mode or the automatic switching mode.

Means for Solving the Problem

[0010] According to one aspect of the hybrid hot water supply method of the present disclosure, in order to achieve the above object, a step of boiling the lower layer water taken out from the hot water storage unit to hot water at a predetermined temperature by the first hot water supply means and storing the hot water in the hot water storage unit; when discharging hot water, boiling the middle layer water of the hot water storage unit to a predetermined temperature by the second hot water supply means and storing the hot water in the hot water storage unit, thereby supplementing the insufficient heat amount required for discharging hot water at the set temperature by the second hot water supply means, and discharging hot water from the hot water storage unit; a step in which a mode information acquisition unit acquires information indicating a manual switching mode or an automatic switching mode of the boiling temperature set for the first hot water supply means; When the mode information acquisition unit acquires the information of the automatic switching mode and there is no operation result information, a step of shifting to the manual switching mode; an operation information acquisition unit During the execution of the manual switching mode, acquires operation information of the first hot water supply means and the second hot water supply means; a cost information acquisition unit acquires information representing the running cost calculated for each different boiling temperature using the operation Result information for a certain period; a boiling temperature selection unit selects a boiling temperature that is the minimum value or a value in the vicinity thereof of the running cost; and a boiling temperature switching unit switches the boiling temperature of the first hot water supply means using the boiling temperature in the manual switching mode or the automatic switching mode.

[0012] In this hybrid hot water supply method, further, a step of switching the boiling temperature set for the first hot water supply means by the boiling temperature switching unit based on the selected boiling temperature may be included.

[0013] In this hybrid hot water supply method, further, a step in which an information presentation unit presents any one or two or more of the manual switching mode, the automatic switching mode, the running cost, and the boiling temperature may be included.

[0014] In this hybrid hot water supply method, further, after the automatic switching mode is selected, during the execution of the manual switching mode, a step of presenting display information indicating that the automatic switching mode is selected by an information presentation unit may be included.

[0015] To achieve the above object, according to one aspect of the hybrid hot water supply system of the present disclosure, lower layer water taken out from a hot water storage unit is boiled up to warm water at a predetermined temperature by a first hot water supply means and stored in the hot water storage unit, and at the time of hot water discharge, middle layer water in the hot water storage unit is boiled up to a predetermined temperature by a second hot water supply means and stored in the hot water storage unit, thereby complementing a shortage of heat amount required for hot water discharge at a set temperature by the second hot water supply means and discharging hot water from the hot water storage unit. A hybrid hot water supply system, comprising: a mode information acquisition unit that acquires information on a manual switching mode or an automatic switching mode of a boiling-up temperature set for the first hot water supply means; When the mode information acquisition unit acquires the information of the automatic switching mode and there is no operation result information, during the execution of the manual switching mode shifted from the automatic switching mode; an operation information acquisition unit that acquires operation information of the first hot water supply means and the second hot water supply means, and cost information acquisition that acquires information representing a running cost calculated for each different boiling-up temperature using the operation Result information for a certain period; a boiling-up temperature selection unit that selects a boiling-up temperature that is the minimum value or a value in the vicinity thereof of the running cost; and a boiling-up temperature switching unit that switches the boiling-up temperature of the first hot water supply means using the boiling-up temperature in the manual switching mode or the automatic switching mode.

[0016] In this hybrid hot water supply system, further, based on the selected boiling-up temperature, the boiling-up temperature switching unit may switch the boiling-up temperature set for the first hot water supply means. In this hybrid hot water supply system, further, an information presentation unit that presents any one or two or more of the manual switching mode, the automatic switching mode, the running cost, and the boiling-up temperature may be provided. In this hybrid water supply system, further, an information input unit is provided, and this information input unit is deployed on the information input screen of the information presentation unit. The information input screen is provided with a mode input unit for inputting information on a manual switching mode or an automatic switching mode of the boiling temperature set for the first water supply means, and a boiling temperature input unit capable of selecting a plurality of boiling temperatures.

[0017] To achieve the above object, according to one aspect of the program of the present disclosure, a program for execution by a computer used in a hybrid water supply system that boils the lower layer water taken out from the hot water storage unit to warm water at a predetermined temperature with the first water supply means and stores the hot water in the hot water storage unit, and when discharging hot water, boils the middle layer water of the hot water storage unit to a predetermined temperature with the second water supply means and stores the hot water in the hot water storage unit, thereby supplementing the insufficient heat amount required for discharging hot water at the set temperature with the second water supply means and discharging hot water from the hot water storage unit, the program includes a function of acquiring information representing a manual switching mode or an automatic switching mode of the boiling temperature set for the first water supply means, When the information of the automatic switching mode is acquired and there is no operation result information, a function of shifting to the manual switching mode, and during the execution of the manual switching mode; a function of acquiring the operation information of the first water supply means and the second water supply means, and the operation Result a function of acquiring information representing the running cost calculated for each different boiling temperature using the information, a function of acquiring selection information of the boiling temperature that becomes the minimum value or a value in the vicinity thereof of the running cost, and a function of causing the computer to switch the boiling temperature of the first water supply means using the boiling temperature in the manual switching mode or the automatic switching mode. 。 Thi In the program, further, a function of causing the computer to switch the boiling temperature set for the first water supply means based on the selected boiling temperature may be executed. In this program, further, a function of causing the computer to present any one or two or more of the manual switching mode, the automatic switching mode, the running cost, and the boiling temperature to the information presentation unit may be executed. In this program, further, after the automatic switching mode is selected, during the execution of the manual switching mode, the computer may be made to execute a function of causing the information presenting unit to present display information indicating that the automatic switching mode is selected.

[0018] To achieve the above object, according to one aspect of the recording medium of the present disclosure, it is a recording medium on which the above program is recorded.

[0019] To achieve the above object, according to one aspect of the hybrid control unit of the present disclosure, the lower layer water taken out from the hot water storage unit is boiled up to warm water at a predetermined temperature by the first hot water supply means and then stored in the hot water storage unit, and at the time of hot water supply, the middle layer water of the hot water storage unit is boiled up to a predetermined temperature by the second hot water supply means and stored in the hot water storage unit, thereby supplementing the insufficient heat amount required for hot water supply at the set temperature by the second hot water supply means, and a hybrid control unit that discharges hot water from the hot water storage unit, the mode information acquisition unit that acquires information indicating a manual switching mode or an automatic switching mode of the boiling temperature set for the first hot water supply means, When the mode information acquisition unit acquires the information of the automatic switching mode and there is no operation result information, during the execution of the manual switching mode shifted from the automatic switching mode; the operation information acquisition unit that acquires the operation information of the first hot water supply means and the second hot water supply means, and the operation Result cost information acquisition unit that acquires information representing the running cost calculated for each different boiling temperature using the information, the boiling temperature selection unit that selects the boiling temperature information that is the minimum value or a value in the vicinity thereof of the running cost, and the boiling temperature switching unit that switches the boiling temperature of the first hot water supply means using the boiling temperature according to the manual switching mode or the automatic switching mode. In this hybrid control unit, further, based on the selected boiling temperature, the boiling temperature switching unit switches the boiling temperature set for the first hot water supply means. To achieve the above object, according to one aspect of the remote control unit of the present disclosure, there is provided a remote control unit in which the hybrid control unit is mounted or associated with the hybrid control unit, the remote control unit comprising an information presentation unit for presenting any one or more of the manual switching mode, the automatic switching mode, the running cost, and the boiling temperature. In this remote control unit, further comprising an information input unit, the information input unit is developed on an information input screen of the information presentation unit, and the information input screen is provided with a mode input unit for inputting information on the manual switching mode or the automatic switching mode set for the first hot water supply means, and a boiling temperature input unit capable of selecting a plurality of boiling temperatures.

Advantages of the Invention

[0020] According to the present disclosure, any of the following effects can be obtained. (1) It is possible to obtain the boiling temperature that can minimize the running cost by accumulating the operation results obtained after a certain elapsed time from the start of operation, and automatically switch to this boiling temperature, thereby reducing the running cost. (2) It is possible to automatically switch the boiling temperature according to the fluctuation of the hot water supply demand, and the running cost can be reduced. (3) It is possible to select the automatic switching mode or the manual switching mode of the boiling temperature. If there is no operation information such as hot water supply demand information, the boiling temperature can be selected to accumulate the operation information, and after the operation information is accumulated, it is possible to automatically switch to the optimal boiling temperature at which the running cost becomes the minimum value or a value close thereto. (4) In the automatic switching mode of the boiling temperature, since the optimal boiling temperature at which the running cost becomes the minimum value or a value close thereto is selected for automatic switching, there is no need for the user to set it. (5) Along with the reduction of the running cost, the hot water storage capacity of the hot water storage unit can be reduced, and the system can be made more compact. (6) In the automatic switching mode of the boiling temperature, the running cost can be reduced according to the hot water supply demand that increases or decreases during the operation period such as winter and summer, so that a highly convenient hybrid hot water supply system can be realized.

Brief Description of the Drawings

[0021]

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Embodiments for Carrying Out the Invention

[0022] 〔First Embodiment〕 FIG. 1 shows a hot water supply process according to the first embodiment. The process shown in FIG. 1 is an example, and the present disclosure is not limited to such a process. This hot water supply process is realized by the hybrid hot water supply method or program of the present disclosure. In FIG. 1, S represents a process, and the numbers attached to S are an example of the process order. Each functional part of the hybrid hot water supply system 2 (FIG. 2) is cited in the description of this hot water supply process.

[0023] This hot water supply process includes control of mode setting and condition determination, control by an automatic switching mode of the boiling temperature Th, and control by a manual switching mode. Even if the automatic switching mode is selected, if there is no operation result information, the selection of the boiling temperature Th in the manual switching mode is made to accumulate operation result information. Based on this accumulation, reduction of the running cost RC by the automatic switching mode is achieved. Mode setting and condition determination include initial setting (S101) including mode setting, acquisition determination of mode selection information (S102), and determination of automatic switching mode conditions (S103).

[0024] The automatic switching mode includes setting of the automatic switching mode (S104), acquisition of efficiency information (S105), acquisition of unit price information (S106), acquisition determination of hot water supply demand information for a certain period (S107), determination of the operation period (S108), calculation of the running cost RC (S109), selection of the boiling temperature Th (S110), switching of the boiling temperature Th (S111), acquisition of operation information (S112), presentation of information (S113), determination of operation continuation (S114), etc. The manual switching mode includes, in addition to the setting of the manual switching mode (S115), the selection of the boiling temperature Th (S116), and the acquisition determination of the boiling temperature information (S117), the acquisition of the operation information common to the automatic switching mode (S112), the presentation of the information (S113), the determination of the continuation of the operation (S114), etc.

[0025] <Mode setting and condition determination> Initial setting including mode setting (S101): The hybrid control unit 10 executes the initial setting including the mode setting. Acquisition determination of mode selection information (S102): The hybrid control unit 10 determines the acquisition of the mode information based on the user selection. That is, it determines the acquisition of the mode selection information indicating whether it is the automatic switching mode that automatically switches the boiling temperature Th or the manual switching mode that switches manually. Determination of the automatic switching mode conditions (S103): When the automatic switching mode is selected, the hybrid control unit 10 determines whether the operating conditions of the automatic switching mode are satisfied. That is, it determines whether the operating information necessary for the automatic switching of the boiling temperature Th is accumulated and held.

[0026] <Automatic switching mode of the boiling temperature Th> Automatic switching mode (S104): If the operating conditions necessary for the automatic switching mode are satisfied, the hybrid control unit 10 shifts to the automatic switching mode and executes the automatic switching mode.

[0027] Acquisition of efficiency information (S105): The cost information acquisition unit 30 refers to the operation information database (DB) 158 (Figure 12) and acquires efficiency information such as the COP (Coefficient Of Performance) of the HP unit 6 and the hot water supply efficiency of the gas water heater 8. The COP is the growth coefficient and is an index representing the energy-saving performance of the HP unit 6, and is closely related to the running cost RC of the hybrid hot water supply system 2 together with the hot water supply efficiency of the gas water heater 8. Obtaining unit price information of charges (S106): The cost information acquisition unit 30 refers to the operation information DB 158 to obtain the unit price information of charges. The unit price of charges includes the unit price of power consumption and the unit price of gas consumption. The former is used for calculating the running cost RC from the power consumption over a certain period, and the latter is used for calculating the running cost RC from the gas consumption over a certain period.

[0028] Determination of obtaining hot water supply demand information for a certain period (S107): The hot water supply demand information acquisition unit 28 determines whether it has obtained at least the continuous hot water supply demand information for a certain period. The hot water supply demand is the amount of hot water supplied from the hot water storage unit 4, and for a certain period, for example, it is the amount of hot water supplied in one week. The start and end points of one week may be based on, for example, the arrival time of the same day of the week. The certain period for obtaining the hot water supply demand information may be 10 days, 20 days, one month, etc. Determination of the operation period (S108): The cost information acquisition unit 30 obtains the operation period information and determines the operation period. The operation period is the operation time when the hybrid hot water supply system 2 is operating. This period includes, for example, the frosting period, winter period, intermediate period, and summer period, and these periods are determined by the outside air temperature. For example, the frosting period < 10°C, 8°C < winter period < 18°C, 16°C < intermediate period < 25°C, 23°C < summer period can be set.

[0029] Calculation of running cost RC (S109): The cost information acquisition unit 30 calculates the running cost RC using the multiple boiling temperatures Th of the HP unit 6, for example, 65°C, 75°C, 85°C as parameters. The running cost RC uses the multiple boiling temperatures Th as parameters, and uses the COP of the HP unit 6, the hot water supply efficiency of the gas water heater 8, the unit prices of electricity and gas, the hot water supply amount for a certain period, and the temperature information representing the operation period to obtain the power consumption and gas consumption for a certain period and integrate the running cost RC. In this case, the boiling temperature Th = 65°C, 75°C, 85°C, and the hot water supply temperature linkage value as parameters to calculate multiple running costs RC.

[0030] Selection of boiling temperature Th (S110): The boiling temperature selection unit 32 selects the minimum value or a value in the vicinity thereof of the running cost RC calculated for each boiling temperature Th used as a parameter, and selects the optimal boiling temperature Th corresponding to this minimum value or the value in the vicinity thereof. Switching of boiling temperature Th (S111): The boiling temperature switching unit 34 sets the selected boiling temperature Th in the HP control unit 20 of the HP unit 6. Thereby, the boiling temperature Th of the HP unit 6 is automatically switched by the hybrid control unit 10.

[0031] Acquisition of operation information (S112): The operation information acquisition unit 36 acquires the operation information of the HP unit 6 from the HP control unit 20 and acquires the operation information of the gas water heater 8 from the hot water supply control unit 24. These operation information are stored in the operation information DB 158. Presentation of information (S113): The information presentation control unit 38 generates presentation information from various control information acquired by the hybrid control unit 10 up to the present time, and presents it to the information presentation unit 42. Determination of continuous operation (S114): The hybrid control unit 10 acquires operation end information and the like from the information input unit of the remote control unit 12 and determines continuous operation. When continuing the operation (YES in S114), it returns to S102 and continues the operation in the automatic switching mode or the manual switching mode.

[0032] <Manual switching mode of boiling temperature Th> Setting of manual switching mode (S115): When the automatic switching mode information has not been acquired (NO in S102) or when the conditions necessary for the automatic switching mode are not satisfied (NO in S103), the manual switching mode is set. Selection of boiling temperature Th (S116): In the manual switching mode, the boiling temperature Th is left to the user's selection. This selection of the boiling temperature Th is made from the information input unit 40 of the remote control unit 12. As the boiling temperature Th set in the HP unit 6, for example, boiling temperature information representing boiling temperatures such as 65°C, 75°C, 85°C, and linked to the hot water supply temperature is left to the user's selection.

[0033] Acquisition determination of boiling temperature information (S117): The mode information acquisition unit 26 of the hybrid control unit 10 performs the acquisition determination of the boiling temperature information while acquiring the mode information. If the boiling temperature information is acquired, it operates in the manual switching mode. In this manual switching mode, the operation information acquisition unit 36 acquires the operation information in the manual switching mode (S112). Then, the hybrid control unit 10 presents the information acquired up to the current time (S113), and similarly, makes a determination on the continuation of operation (S114).

[0034] <Hybrid hot water supply system 2> FIG. 2 shows an example of the hybrid hot water supply system 2 according to the first embodiment. The configuration shown in FIG. 2 is an example, and the present disclosure is not limited to such a configuration. This hybrid hot water supply system 2 includes a hot water storage unit 4, an HP unit 6, a gas water heater 8, a hybrid control unit 10, and a remote control unit 12. The hot water storage unit 4 includes a hot water storage tank 14 and a hot water storage control unit 16. The hot water storage tank 14 stores the hot water HW heated by the HP unit 6 in a hierarchical heat storage state where the temperature becomes high from the lower layer to the upper layer, and supplies the hot water HW to the demand location based on the hot water supply demand. The hot water storage control unit 16 performs the hot water supply and hot water storage control of the hot water HW in order to realize hot water supply at a set temperature with the hot water in the hot water storage tank 14.

[0035] The HP unit 6 is an example of the first hot water supply means and includes a heat exchange section 18 and an HP control section 20. The heat exchange section 18 circulates the feed water W obtained from the lower layer portion of the hot water storage tank 14, exchanges the heat of the feed water W with the heat of the heat medium, and converts the feed water W into hot water HW. The HP control section 20 sets the boiling temperature of the hot water HW and boils the hot water HW to the boiling temperature Th. This boiling temperature is set by the hybrid control section 10. The gas water heater 8 is an example of the second hot water supply means and includes a heat exchange section 22 and a hot water supply control section 24. The heat exchange section 22 uses, for example, the combustion of fuel gas as a heat source, exchanges the combustion heat with the low-temperature hot water HW obtained from the middle layer of the hot water storage unit 4, and raises the temperature of the hot water HW. The hot water supply control section 24 detects the inflow of the hot water HW from the hot water storage tank 14 to start the combustion of the fuel gas, controls to heat the hot water HW with the combustion heat, and returns the hot water HW heated to a certain temperature to the hot water storage tank 14.

[0036] The hybrid control section 10 is an example of a hybrid control unit and includes a communication function and is composed of, for example, a computer. As an information processing function section of this computer, the hybrid control section 10 is configured with a mode information acquisition section 26, a hot water supply demand information acquisition section 28, a cost information acquisition section 30, a boiling temperature selection section 32, a boiling temperature switching section 34, an operation information acquisition section 36, an information presentation control section 38, and the like. The mode information acquisition section 26 acquires the manual switching mode information or the temperature automatic switching mode information of the boiling temperature Th as control information input by the user selection operation of the remote control unit 12. The hot water supply demand information acquisition section 28 acquires the hot water supply demand information representing the amount of hot water supplied to the demand location from the hot water storage control section 16 of the hot water storage unit 4, stores it in the operation information DB 158, and accumulates each operation information.

[0037] The cost information acquisition section 30 calculates the running cost RC. This running cost RC is calculated as the running cost RC generated by hot water supply for a certain period during operation using at least the power consumption information and the gas consumption information generated by hot water supply for a certain period, and the cost information representing this running cost RC is acquired. The running cost RC is calculated using a plurality of boiling temperatures Th that can be set in the HP unit 6, for example, 65°C, 75°C, and 85°C as parameters. That is, the cost information acquisition unit 30 uses the plurality of boiling temperatures Th as parameters, and uses the COP of the HP unit 6, the hot water supply efficiency of the gas water heater 8, the unit prices of electricity and gas, the hot water supply amount over a certain period, and temperature information representing the operating period to obtain the power consumption and gas consumption over a certain period and integrate the running cost RC. In this case, a plurality of running costs RC are calculated using the boiling temperatures Th = 65°C, 75°C, 85°C and the hot water supply temperature linked value as parameters.

[0038] The boiling temperature selection unit 32 selects the boiling temperature Th that becomes the minimum value or a value in the vicinity thereof from the cost information. The boiling temperature switching unit 34 switches to the boiling temperature Th that becomes the minimum value or a value in the vicinity thereof from the cost information. The operation information acquisition unit 36 acquires the operation information of the HP unit 6 from the HP control unit 20 and the operation information of the gas water heater 8 from the hot water supply control unit 24, stores them in the operation information DB 158, and accumulates each operation information. The information presentation control unit 38 acquires boiling temperature information representing the boiling temperature Th, mode information, operation information, efficiency information, unit price information, hot water supply demand information, etc., generates presentation information, and presents it to the information presentation unit 42 of the remote control unit 12. In this embodiment, the hybrid control unit 10 has a configuration independent of the hot water storage control unit 16 and the remote control unit 12, but it may be integrated with the hot water storage control unit 16 or installed in the remote control unit 12.

[0039] The remote control unit 12 includes an information input unit 40, an information presentation unit 42, and a remote control unit 44. The information input unit 40 is used for information input such as operation start input, operation end input, manual switching mode information or automatic switching mode information setting input of the boiling temperature Th by user operation under the control of the remote control unit 44. The information presentation unit 42 performs information presentation such as mode selection information, boiling temperature information, cost information, operation time information, etc. under the control of the remote control unit 44. The remote control unit 44 performs controls such as information input and output based on wireless or wired connections with the hybrid control unit 10, the hot water storage control unit 16, the HP control unit 20, and the hot water supply control unit 24.

[0040] <Information input screen 46 of the information input unit 40> FIG. 3 shows the information input screen 46 of the information input unit 40. This information input screen 46 is configured by a touch panel installed on the display screen of the information presentation unit 42 as the information input unit. On this information input screen 46, a manual switching mode section 48, a boiling temperature input section 50, an automatic switching mode section 52, an efficiency information input section 54, and a unit price information input section 56 are set. The manual switching mode section 48 can set the manual switching mode by touch when manually setting the boiling temperature Th. The boiling temperature input section 50 includes a 65°C section 50-1, a 75°C section 50-2, an 85°C section 50-3, and a hot water supply temperature interlocking section 50-4, and can be set by touch when manually setting any boiling temperature Th.

[0041] The automatic switching mode section 52 can be set by touch in the automatic switching mode of the boiling temperature Th. The efficiency information input section 54 is used for inputting efficiency information such as the COP of the HP unit 6 or the gas water heater 8. The unit price information input section 56 is used for inputting unit price information representing unit prices such as electricity charges and gas charges.

[0042] <Information presentation screen 58 of the information presentation unit 42> FIG. 4 shows the information presentation screen 58 of the information presentation unit 42. On this information presentation screen 58, a boiling temperature information section 60, a mode information section 62, a cost information section 64, a hot water supply demand information section 66, an operation information section 68, and an elapsed time information section 70 are set. The boiling temperature information section 60 presents boiling temperature information representing the boiling temperature Th set at the current time. The mode information unit 62 presents mode information indicating the manual switching mode or the automatic switching mode of the boiling temperature Th currently set. The cost information unit 64 presents cost information representing the running cost RC calculated in the automatic switching mode.

[0043] The hot water supply demand information unit 66 presents hot water supply demand information representing the hot water supply demand imposed on the hot water storage unit 4. The operation information unit 68 presents the operation information of the hybrid hot water supply system 2. This operation information includes the operation time of the HP unit 6, the operation time of the gas water heater 8, and their integrated operation time. The operation time of the HP unit 6 is presented in the HP unit operation time unit 68-1, the operation time of the gas water heater 8 is presented in the gas water heater operation time unit 68-2, and the integrated operation time is presented in the integrated operation time unit 68-3. And the elapsed time information unit 70 presents elapsed time information representing the elapsed time since the switching point of the boiling temperature Th.

[0044] <Hybrid hot water supply system 2> FIG. 5 shows the functional units of the hybrid hot water supply system 2 according to the first embodiment. The hot water storage unit 4 receives the supply water W into the hot water storage tank 14, stores the hot water HW heated by the HP unit 6, compensates for the insufficient heat quantity at the time of hot water supply by the heating of the gas water heater 8, and performs hot water supply at the set temperature. The hot water storage tank 14 is an example of the hot water storage means. The supply water W is supplied to the bottom of the hot water storage tank 14 through the water supply pipe 72. The hot water HW is supplied to the required location through the hot water supply pipe 76 provided with the overpressure relief valve 74. The hot water storage control unit 16 controls the hot water supply from the hot water storage unit 4, calculates the insufficient heat quantity of the hot water supply at the set temperature, and provides control information including this insufficient heat quantity to the hybrid control unit 10. This hybrid control unit 10 may be incorporated into the hybrid hot water supply system 2 as a configuration of an independent device as a hybrid control unit in the hybrid hot water supply system 2.

[0045] The HP unit 6 includes a heat medium circulation path 78, an air heat exchanger 80, a compressor 82, a heat medium heat exchanger 84, and an expansion valve 86 in the heat exchange section 18. The heat medium circulation path 78 circulates a heat medium HM which is a heating medium for the feed water W. The air heat exchanger 80 heats the heat medium HM by heat exchange with the heat of the air 87. The compressor 82 raises the temperature and pressure of the heat medium HM by compression. The heat medium heat exchanger 84 exchanges heat between the heat medium HM flowing in the heat medium circulation path 78 and the feed water W flowing in the first hot water storage circulation path 88, and heats the feed water W with the heat of the heat medium HM. The feed water W from the lower layer part of the hot water storage tank 14 flows from the first hot water storage circulation path 88 into the heat medium heat exchanger 84, and hot water HW is supplied from this heat medium heat exchanger 84 to the upper layer part of the hot water storage tank 14. The pressure of the heat medium HM expanded by heat exchange is regulated by the expansion valve 86. The HP control unit 20 has a boiling temperature Th set by the hybrid control unit 10, and heats the feed water W to this boiling temperature Th to make hot water HW.

[0046] The gas water heater 8 is connected to the second hot water storage circulation path 90, and includes a burner 92, a primary heat exchanger 94, a secondary heat exchanger 96, etc. in the heat exchange section 22. In the second hot water storage circulation path 90, the low-temperature hot water HW from the middle layer of the hot water storage tank 14 is taken out, and the hot water HW with the insufficient heat amount supplemented by heating is supplied to the upper layer of the hot water storage tank 14. The burner 92 is an example of a combustion means for the fuel gas G, and generates combustion exhaust gas EG by combustion of the fuel gas G. The secondary heat exchanger 96 mainly exchanges latent heat with the hot water HW from the downstream side of the combustion exhaust gas EG. The primary heat exchanger 94 receives the supply of the hot water HW that has passed through the secondary heat exchanger 96, and mainly exchanges sensible heat with the hot water HW from the upstream side of the combustion exhaust gas EG. The hot water supply control unit 24 receives control information from the hybrid control unit 10, heats the hot water HW from the hot water storage unit 4, and compensates for the insufficient heat amount of the hot water supply at the set temperature.

[0047] Then, the hybrid control unit 10 executes the hybrid control described in FIG. 1, calculates the minimum value of the running cost RC using, as parameters, a plurality of boiling temperatures Th with the hot water supply amount for, for example, one week as a fixed period, selects the boiling temperature Th from the running cost RC corresponding to this minimum value, provides this boiling temperature Th to the HP control unit 20, and automatically switches the boiling temperature Th of the HP unit 6. Regarding the selection of this boiling temperature Th, it is sufficient to use the minimum value of the running cost RC as a reference, but it is also possible to select the running cost RC from values near this minimum value and then select the boiling temperature Th from this running cost RC. In the manual setting, the user can set the boiling temperature Th = 65°C, 75°C, 85°C, or a boiling temperature such as being linked to the hot water supply temperature. The remote control unit 12 is used for setting the setting mode of the boiling temperature Th, inputting information including remote instructions for various controls, and manual operations of the hybrid control unit 10.

[0048] <Effects of the First Embodiment> According to this first embodiment, any of the following effects can be obtained. (1) It is possible to obtain the boiling temperature that can minimize the running cost RC by accumulating the operation results obtained at a fixed elapsed time from the start of operation, automatically switch to this boiling temperature, and reduce the running cost RC. (2) Even when the hot water supply demand fluctuates, it is possible to automatically switch the boiling temperature according to this fluctuation, and the running cost RC can be reduced. (3) If there is no operation information such as hot water supply demand information, it is possible to select the boiling temperature and accumulate the operation information, and after accumulating the operation information, automatically switch to the optimal boiling temperature at which the running cost RC becomes the minimum value or a value near it. (4) For hot water supply over a certain period of about one week, taking the boiling temperature Th of the HP unit 6 as a parameter, the minimum value or a value close to it of the running cost RC of the hybrid hot water supply system 2 is calculated, and the boiling temperature Th corresponding to the minimum value or a value close to it of the running cost RC can be selected, and the boiling temperature Th of the HP unit 6 can be automatically switched, thereby reducing the running cost RC. (5) By simply setting the unit price of electricity or fuel gas, the operation period can be selected by acquiring temperature information, so the optimal boiling temperature Th can be automatically set from the minimum value or a value close to it of the running cost RC, eliminating the user's effort and realizing a highly convenient system. (6) Through the coordinated operation of the HP unit 6 and the gas water heater 8, it is possible to contribute to reducing the capacity of the hot water storage tank 14 of the hot water storage unit 4 and make the system more compact. (7) Even if the seasonal operating conditions and installation environment are different, the error of the running cost RC can be absorbed by calculating the minimum value or a value close to it of the running cost RC, so a highly convenient hybrid hot water supply system 2 can be provided. (8) It can be checked at any time on the screen display of the information presentation unit 42, such as cost information and operation information.

[0049] 〔Second Embodiment〕 FIG. 6 shows the hybrid hot water supply system 2 according to the second embodiment. The configuration shown in FIG. 6 is an example, and the present disclosure is not limited to such a configuration. This hybrid hot water supply system 2 is composed of a hot water storage unit 4, an HP unit 6, a gas water heater 8, and a remote control unit 12 as independent devices.

[0050] <Hot water storage unit 4> FIG. 7 shows an example of the hot water storage unit 4. The hot water storage tank 14 has a water supply pipe 72 connected to its bottom, and the water supply W such as tap water is supplied from this water supply pipe 72 to the lower layer side of the hot water storage tank 14. The temperature sensor 98-1 detects the water supply temperature T1. The temperature sensor 98-2 detects the temperature T2 of the hot water HW flowing through the hot water outlet pipe 100. The temperature sensor 98-3 detects the upper layer temperature T3 of the hot water storage tank 14, the temperature sensor 98-4 detects the middle layer temperature T4 of the hot water storage tank 14, the temperature sensor 98-5 detects the middle layer temperature T5 of the hot water storage tank 14, and the temperature sensor 98-6 detects the lower layer temperature T6 of the hot water storage tank 14.

[0051] The mixing valve 102 is installed at the confluence point of the hot water outlet pipe 100 and the bypass pipe 104, mixes the hot water HW and the water supply W from the water supply side, and flows the mixed water into the hot water supply pipe 76. This mixing ratio is determined by the opening degrees on the bypass pipe 104 side and the hot water outlet pipe 100 side. The flow rate sensor 106 detects the presence or absence or the passing flow rate of only the water supply W from the bypass pipe 104, the mixed hot water of this water supply W and the hot water HW from the hot water outlet pipe 100, or only the hot water HW from the hot water outlet pipe 100. The temperature sensor 98-7 detects the temperature T7 of the hot water HW passing through the hot water supply pipe 76.

[0052] The hot water storage circulation path 88 is a circulation path connected between the hot water storage tank 14 and the HP unit 6. This hot water storage circulation path 88 includes a forward pipe 88-1, a return pipe 88-2, and a bypass pipe 88-3. The forward pipe 88-1 is a pipe that guides the lower layer water of the hot water storage tank 14 to the HP unit 6, and includes a circulation pump 108 and a temperature sensor 98-8. The temperature sensor 98-8 detects the temperature T8 of the water supply W flowing from the hot water storage tank 14 to the HP unit 6.

[0053] The return pipe 88-2 is a pipe that guides the hot water HW heated by the HP unit 6 to the upper layer of the hot water storage tank 14, and includes a temperature sensor 98-9 and a switching valve 110. The temperature sensor 98-9 detects the temperature T9 of the hot water HW from the HP unit 6. When the temperature T9 of the temperature sensor 98-9 reaches the lower limit temperature, the switching valve 110 switches the flow direction of the hot water HW from the bypass pipe 88-3 to the return pipe 88-2.

[0054] The hot water storage circulation path 90 is a circulation path connected between the hot water storage tank 14 and the gas water heater 8. This hot water storage circulation path 90 includes a forward pipe 90-1, a return pipe 90-2, and a circulation pump 112. When heating the hot water HW in the hot water storage tank 14, the circulation pump 112 is driven. When the circulation pump 112 is driven, the middle layer water in the hot water storage tank 14 is taken out by the forward pipe 90-1 and circulated to the gas water heater 8. After being heated by this gas water heater 8, it is returned to the upper layer part of the hot water storage tank 14 through the return pipe 90-2. And a temperature sensor 98-10 for detecting the outside air temperature T10 is installed in the hot water storage unit 4. The detected temperature of this temperature sensor 98-10 is used for determining the season corresponding to the operating period, such as whether the operating period is the frosting period, winter, intermediate period, summer, etc.

[0055] The hot water storage control unit 16 acquires the detected temperatures of each temperature sensor 98-1, 98-2, 98-3, 98-4, 98-5, 98-6, 98-7, 98-8, 98-9, 98-10 and the detected flow rate of the flow rate sensor 106, generates the switching control output of the mixing valve 102 and the switching valve 110, and the control output of the circulation pumps 108 and 112, and performs the hot water storage control of the hot water storage unit 4.

[0056] <HP unit 6> Figure 8 shows an example of the HP unit 6. As an example, this HP unit 6 includes a heat medium heat exchanger 84, an air heat exchanger 80, a compressor 82, an expansion valve 86, and a heat medium circulation path 78, and constitutes a CO2 heat medium cycle. The heat medium heat exchanger 84 performs heat exchange between the water supply W on the hot water storage tank 14 side and the heat medium HM on the heat medium circulation path 78 side. The temperature sensor 98-11 detects the inlet temperature T11 of the heat medium heat exchanger 84, and the temperature sensor 98-12 detects the outlet temperature T12 thereof. The air heat exchanger 80 performs heat exchange between the atmosphere and the heat medium HM before compression circulating in the heat medium circulation path 78 by the rotation of the fan 114, and causes the heat medium HM to absorb heat. The compressor 82 compresses the heat medium HM by electricity. The temperature sensor 98-13 detects the temperature T13 of the outside air taken into the HP unit 6. The temperature sensor 98-14 detects the outlet temperature T14 of the air heat exchanger 80, and the temperature sensor 98-15 detects the outlet temperature T15 of the compressor 82.

[0057] The HP unit 6 always maintains its operating state and supplements the hot water heat quantity in the hot water storage tank 14 for hot water supply demand during independent operation. When the lower layer water temperature of the hot water storage tank 14 reaches the upper limit temperature, since the detected temperature of the temperature sensor 98 - 11 rises, the operation of the HP unit 6 may be stopped.

[0058] <Gas water heater 8> Figure 9 shows an example of the gas water heater 8. The hot water storage circulation path 90 connected between the gas water heater 8 and the hot water storage tank 14 includes a forward pipe 90 - 1 and a return pipe 90 - 2. A flow rate sensor 116 and a temperature sensor 98 - 16 are installed in the forward pipe 90 - 1, and a temperature sensor 98 - 17 is installed in the return pipe 90 - 2. The flow rate sensor 116 detects the flow rate of the middle layer water of the hot water storage tank 14 flowing into the gas water heater 8. The temperature sensor 98 - 16 detects the middle layer water temperature T16 entering the gas water heater 8. The temperature sensor 98 - 17 detects the temperature T17 of the hot water HW returned from the gas water heater 8 to the hot water storage tank 14. The gas water heater 8 may be provided with a bypass pipe that bypasses the secondary heat exchanger 96 and the primary heat exchanger 94 on the downstream side of the flow rate sensor 116 and the upstream side of the temperature sensor 98 - 17, and a mixing valve where the bypass pipe and the hot water storage circulation path 90 merge.

[0059] <Remote control unit 12> A in Figure 10 shows an example of the remote control unit 12. This remote control unit 12 is provided with an information presentation screen 58 of the information presentation unit 42, a hot water supply button 118, a hot water supply lamp 120, a constant boiling button 122, a constant boiling lamp 124, a schedule operation button 126, a schedule operation lamp 128, and an opening / closing lid 130 is installed. Operation information such as the boiling temperature, hot water supply temperature, and hybrid operation is presented on the information presentation screen 58. The hot water supply button 118 is operated to start or stop the hot water supply operation, and during the hot water supply operation, the hot water supply lamp 120 lights up. The always-boiling button 122 is operated when always filling the hot water HW into the hot water storage tank 14, and during that operation, the always-boiling lamp 124 lights up. The scheduled operation button 126 is operated, for example, for schedule settings such as boiling up the hot water HW according to business hours, and during the scheduled operation, the scheduled operation lamp 128 lights up.

[0060] B in FIG. 10 shows the setting operation unit 132 of the remote control unit 12 with the opening / closing lid 130 opened. This setting operation unit 132 is provided with a boiling-up setting button 134, a rapid button 136, a business setting button 138, a pause setting button 140, a usage status confirmation button 142, a menu button 144, a hot water supply temperature setting button 146, a determination button 148, and a return button 150 for returning to the previous screen. The boiling-up setting button 134 is operated when setting the boiling-up temperature of the hot water HW stored in the hot water storage tank 14. Also, the boiling-up setting button 134 enables selection of the automatic switching mode of the boiling-up temperature Th. The rapid button 136 is operated during rapid operation, for example, when boiling up for hot water supply outside business hours.

[0061] The business setting button 138 is used for time settings such as the business hours of the store. The pause setting button 140 is used for pause settings such as on holidays other than regular holidays. The usage status confirmation button 142 is operated to confirm the usage status. The menu button 144 is used for remote control settings. The hot water supply temperature setting button 146 is linked to the boiling-up setting button 134, the usage status confirmation button 142, the menu button 144, etc., and is operated to increase or decrease the set temperature and select various setting parameters. The determination button 148 is used to confirm the selected temperature or various setting parameters. By operating the return button 150, the selected temperature or various setting parameters are not confirmed and the screen returns to the previous one.

[0062] <Running Cost RC of Power Consumption, Gas Consumption and Hybrid Water Heater System 2> 1) Power Consumption In the HP unit 6, functional parts such as the compressor 82 and the drive motors of the fans 114 are power loads, so power is consumed during the operation period. Therefore, for example, the running cost RC regarding the power consumption of the HP unit 6 alone for a certain period can be obtained by multiplying the power consumption amount during that period by the unit price of the charge. Regarding other power consumption, in the hot water storage unit 4, functional parts such as the mixing valve 102, the circulation pumps 108 and 112, the switching valve 110, and the hot water storage control unit 16 are power loads, so power is consumed during the operation period. In the gas water heater 8 as well, functional parts such as the fuel switching mechanism of the burner 92 and the hot water supply control unit 24 are power loads, so power is consumed during the operation period. Also, there is power consumption in the hybrid control unit 10 and the remote control unit 12. However, since these power consumptions are small values compared to the power consumption of the HP unit 6, they may be omitted in the calculation of the running cost RC of the hybrid water heater system 2.

[0063] 2) Gas Consumption In the gas water heater 8, during the operation period of gas water heating, the fuel gas G is consumed by the combustion of the burner 92. Therefore, the running cost RC regarding the gas consumption of the gas water heater 8 for a certain period can be calculated by multiplying the gas consumption amount by the unit price of the charge.

[0064] <Hardware of Hybrid Control Unit 10> FIG. 11 shows the hardware of the hybrid control unit 10 and the linkage relationship with the hot water storage control unit 16, the HP control unit 20, the hot water supply control unit 24, and the remote control unit 44. The hybrid control unit 10 includes a processor 152, a storage unit 154, and an input / output unit (I / O) 156. The processor 152 executes information processing by the OS (Operating System) in the storage unit 154. This information processing includes executing various programs such as a hot water supply control program, and various controls such as calculating the minimum value or a value in the vicinity of the running cost RC, and determining the boiling temperature optimal for realizing this minimum value or a value in its vicinity. The storage unit 154 is an example of a recording medium that records the program of the present disclosure. In addition to the OS, a hot water supply control program is stored in this storage unit 154, and it can be configured by storage elements such as a ROM (Read-Only Memory), a RAM (Random-Access Memory), and an EEPROM (Electrically Erasable Programmable Read-Only Memory). The I / O 156 exchanges information with the hot water storage control unit 16, the HP control unit 20, the hot water supply control unit 24, and the remote control unit 44 under the control of the processor 152.

[0065] Although not shown, the remote control unit 44 has computer functions such as a processor similar to the hybrid control unit 10, and presents various presentation information such as temperature information representing the boiling temperature sent from the hybrid control unit 10 to the information presentation unit 42. Since the configuration of the information input unit 40 has been described above, its description is omitted. The hot water storage control unit 16 is connected to the aforementioned temperature sensors 98-1 to 98-10, the mixing valve 102, the flow rate sensor 106, the circulation pumps 108, 112, and the switching valve 110. The detection information of various sensors is transmitted to the hybrid control unit 10 through the hot water storage control unit 16. The HP control unit 20 is connected to the aforementioned temperature sensors 98-11, 98-12, 98-13, 98-14, 98-15. The hot water supply control unit 24 is connected to the aforementioned flow rate sensor 116, temperature sensors 98-16, 98-17. Similarly, the detection information of various sensors is transmitted to the hybrid control unit 10 through the hot water supply control unit 24.

[0066] <Information Processing by the Processor 152> The information processing of the processor 152 by executing the program includes a) Cooperative control of the hot water storage control unit 16, the HP control unit 20, the hot water supply control unit 24, and the remote control unit 44 b) Acquisition of hot water supply demand information c) Calculation of power consumption and gas consumption d) Setting of the boiling temperature e) Acquisition of efficiency information f) Acquisition of operation period information and determination of the operation period g) Calculation of the running cost RC h) Selection and automatic setting of the boiling temperature Th i) Generation of the operation information DB 158 j) Presentation of information such as operation information and running cost RC and the like.

[0067] <Operation information DB 158> FIG. 12 shows an example of the operation information DB 158. The operation information file 160 is stored in this operation information DB 158. The operation information file 160 is set with a date and time section 162, an operation period section 164, a calculation period section 166, a hot water storage unit section 168, an HP unit section 170, a gas water heater section 172, a hot water supply supply-demand ratio section 174, a running cost section 176, and a boiling temperature section 178.

[0068] The date and time section 162 stores date and time information indicating the date and time such as the operation period. The operation period section 164 stores operation period information. The operation period is set with seasons such as the frosting period, the winter period, the intermediate period, and the summer period. These seasons are determined and set by the hybrid control unit 10 from the detected temperature of the temperature sensors 98-10. The calculation period section 166 stores period information representing a calculation period such as one week as the calculation period of the running cost RC.

[0069] The operation information of the hot water storage unit 4 is stored in the hot water storage unit section 168. In this hot water storage unit section 168, a water supply temperature section 168-1, a hot water output section 168-2, and a hot water supply load section 168-3 are set. Temperature information representing the water supply temperature of the water supply W is stored in the water supply temperature section 168-1. Hot water output information indicating the hot water output of the hot water HW from the hot water storage unit 4 is stored in the hot water output section 168-2. Hot water supply load information indicating the hot water supply load on the hot water storage unit 4, such as the hot water supply temperature, is stored in the hot water supply load section 168-3.

[0070] The operation information of the HP unit 6 is stored in the HP unit section 170. In this HP unit section 170, a COP section 170-1, an operation time section 170-2, a power consumption section 170-3, a unit price section 170-4, and a cost information section 170-5 are set. COP information of the HP unit 6 is stored in the COP section 170-1. Time information representing the operation time of the HP unit 6 is stored in the operation time section 170-2. Power consumption information representing the power consumption of the HP unit 6 is stored in the power consumption section 170-3. Unit price information representing the unit price of the power consumption, for example, the unit price of the commercial AC power supply, is stored in the unit price section 170-4. Cost information, for example, cost information given by the product of the power consumption and the unit price, is stored in the cost information section 170-5.

[0071] The operation information of the gas water heater 8 is stored in the gas water heater section 172. In this gas water heater section 172, an operation time section 172-1, a gas consumption section 172-2, a unit price section 172-3, and a cost information section 172-4 are set. Time information representing the operation time of the gas water heater 8 is stored in the operation time section 172-1. Gas consumption information representing the gas consumption of the gas water heater 8 during the operation time of the gas water heater 8 is stored in the gas consumption section 172-2. Unit price information representing the unit price of the consumed gas, for example, the unit price of LP gas or city gas, is stored in the unit price section 172-3. Cost information, for example, cost information given by the product of the gas consumption and the unit price, is stored in the cost information section 172-4.

[0072] In the hot water supply demand ratio section 174, ratio information representing the hot water supply demand ratios of the HP unit 6 and the gas water heater 8 is stored as the burden distribution for the hot water supply demand. In this hot water supply demand ratio section 174, an HP unit section 174-1 and a gas water heater section 174-2 are set. In the HP unit section 174-1, ratio information representing the supply and demand amount borne by the HP unit 6 for the hot water supply demand is stored. In the gas water heater section 174-2, ratio information representing the supply and demand amount borne by the gas water heater 8 for the hot water supply demand is stored. The supply and demand amount of this gas water heater section 174-2 includes complementary information on the insufficient heat amount of the hot water storage unit 4 with respect to the hot water supply temperature.

[0073] In the running cost section 176, cost information representing the running cost RC is stored. In this running cost section 176, a boiling temperature section 176-1 and a minimum value section 176-2 are set. In the boiling temperature section 176-1, parameter information for calculating the running cost RC is stored. In this boiling temperature section 176-1, a 65°C section 176-11, a 75°C section 176-12, an 85°C section 176-13, and a hot water supply temperature linkage section 176-14 are set.

[0074] In the 65°C section 176-11, cost information representing the running cost RC when using 65°C as the parameter is stored. In the 75°C section 176-12, cost information representing the running cost RC when using 75°C as the parameter is stored. In the 85°C section 176-13, cost information representing the running cost RC when using 85°C as the parameter is stored. Also, in the hot water supply temperature linkage section 176-14, cost information representing the running cost RC when using the hot water supply temperature linkage value as the parameter is stored.

[0075] In the minimum value section 176-2, cost information representing the minimum value or a value in the vicinity of the running cost RC, together with temperature information representing the boiling temperature Th corresponding to this cost information, is stored. And in the boiling temperature section 178, temperature information representing the optimal boiling temperature Th corresponding to the minimum value or a value in the vicinity of the running cost RC is stored.

[0076] <Hot water supply control> FIG. 13 shows the hot water supply control of the hybrid hot water supply system 2. The hot water supply control of this hybrid hot water supply system 2 includes setting of the boiling temperature Th (S201), boiling of the hot water HW by the HP unit 6 (S202), hot water storage by the hot water storage unit 4 (S203), hot water supply request (S204), determination of hot water supply at the set temperature (S205), calculation of the insufficient heat quantity (S206), heating of the hot water by the gas water heater 8 (S207), determination of hot water supply at the set temperature (S208), hot water supply at the set temperature (S209), and the like.

[0077] Setting of the boiling temperature Th (S201): The hybrid control unit 10 is set with boiling temperatures such as the boiling temperature Th = 65°C, 75°C, 85°C, and hot water supply temperature linkage. Note that this boiling temperature Th can also be set by the user from the information input unit 40 of the remote control unit 12. Boiling of the hot water HW by the HP unit 6 (S202): The hybrid control unit 10 receives the "ON" input of the hot water supply button 118 of the remote control unit 12 and shifts to the operating state. As a result, the HP control unit 20 of the HP unit 6 receives the start of operation, and the boiling of the hot water HW by the HP unit 6 is started. Hot water storage by the hot water storage unit 4 (S203): The hot water storage unit 4 stores the hot water HW based on the boiling by the HP unit 6.

[0078] Hot water supply request (S204): When the hot water storage unit 4 receives a hot water supply request due to the occurrence of hot water supply demand, the hot water HW of the hot water storage unit 4 is supplied to the hot water supply demand location. Determination of hot water supply at the set temperature (S205): The hybrid control unit 10 determines, using the heat storage information of the hot water storage unit 4, whether hot water supply at the set temperature is possible from the hot water storage control unit 16 upon receiving a hot water supply request. If hot water supply at the set temperature is possible (YES in S205), hot water supply at the set temperature (S209) is executed.

[0079] Calculation of insufficient heat quantity (S206): If hot water supply at the set temperature is not possible (NO in S205), the hot water storage control unit 16 calculates the insufficient heat quantity and provides control information for supplementing the insufficient heat quantity to the hybrid control unit 10. Hot water heating by the gas water heater 8 (S207): As control for supplementing the insufficient heat quantity, the hybrid control unit 10 drives the circulation pump 112. By driving this circulation pump 112, intermediate layer water is supplied from the hot water storage tank 14 to the gas water heater 8 through the forward pipe 90-1 of the hot water storage circulation path 90. This water supply becomes a hot water supply request, and the gas water heater 8 starts hot water supply. That is, due to this hot water supply request, the burner 92 ignites and shifts to the operating state. As a result, the intermediate layer water is heated to high-temperature hot water HW and returned to the upper layer part of the hot water storage tank 14 through the return pipe 90-2.

[0080] Determination of hot water supply at the set temperature (S208): The hybrid control unit 10 determines whether hot water supply at the set temperature is possible from the hot water storage control unit 16 using the heat storage information of the hot water storage unit 4. If hot water supply at the set temperature is possible (YES in S208), hot water supply at the set temperature (S209) is executed. If hot water supply at the set temperature is not possible (NO in S208), the calculation of the insufficient heat quantity (S206) and the hot water heating by the gas water heater 8 (S207) are executed again. Hot water supply at the set temperature (S209): Through such control, hot water supply at the set temperature can be obtained from the hybrid hot water supply system 2.

[0081] <Mode setting and mode switching process> Figure 14 shows the processing steps of the mode setting and mode switching process. In this process, if the automatic switching mode of the boiling temperature is set in the initial setting, that mode is memorized, and if there is no operation record, the operation record is accumulated automatically in the manual switching mode, and accordingly, the mode can be shifted to the automatic switching mode. This processing step includes mode setting (S301), operation performance determination (S302), operation in automatic switching mode (S303), operation in manual switching mode (S304), accumulation of operation performance (S305), calculation of running cost RC (S306), selection of boiling temperature Th (S307), switching of boiling temperature Th (S308), acquisition of operation information (S309), etc.

[0082] Mode setting (S301): For example, at the initial installation of the hybrid water supply system 2, the boiling temperature Th is set to an arbitrary value, and either the automatic switching mode or the manual switching mode is selected. Thereby, the hybrid control unit 10 acquires the selected mode information. Operation performance determination (S302): The hybrid control unit 10 acquires the mode setting information and determines the operation performance information. Since the operation performance information is stored in the operation information DB158, this operation performance information is acquired. This operation performance information makes a conditional judgment on whether the automatic switching of the boiling temperature Th is possible.

[0083] Operation in automatic switching mode (S303): If there is the necessary operation performance information (YES in S302), the hybrid control unit 10 operates in the automatic switching mode. Operation in manual switching mode (S304): If there is no necessary operation performance information (NO in S302), the hybrid control unit 10 operates in the manual switching mode. Accumulation of operation performance (S305): No matter which mode the operation starts in, the hybrid control unit 10 acquires the operation information and stores and accumulates the operation performance information in the operation information DB158.

[0084] Calculation of running cost RC (S306): The hybrid control unit 10 calculates the aforementioned running cost RC with different boiling temperatures Th as parameters. Selection of boiling temperature Th (S307): The hybrid control unit 10 selects the boiling temperature Th at which the running cost RC becomes the minimum value or a value in its vicinity. Switching of boiling temperature Th (S308): As switching processing of the boiling temperature Th, the hybrid control unit 10 compares the boiling temperature Th at which the running cost RC becomes the minimum value or its approximate value with the currently operating boiling temperature Th, switches to the boiling temperature Th at which the running cost RC becomes the minimum value or its approximate value, and maintains that value if the current boiling temperature Th is the optimum value. Acquisition of operation information (S309): After the switching processing of the boiling temperature Th, the hybrid control unit 10 acquires the operation information of the hybrid water supply system 2 and returns to S305.

[0085] <Calculation of running cost RC per week and automatic switching of boiling temperature> FIG. 15 shows the calculation of the running cost RC per week and the automatic switching control of the boiling temperature. The calculation of the running cost RC of the hybrid water supply system 2 and the automatic switching control of the boiling temperature include determination of the calculation period (S401), setting of the boiling temperature Th (S402), calculation of the power consumption of the HP unit 6 (S403), calculation of the gas consumption of the gas water heater 8 (S404), calculation of the minimum value or its approximate value of the running cost RC (S405), selection of the boiling temperature Th (S406), automatic switching of the boiling temperature Th (S407), etc.

[0086] Determination of the calculation period (S401): The hybrid control unit 10 determines the calculation period. This calculation period is, for example, one week. If it is one week, the seven days between the same days of the week are the calculation period. In this example, the hybrid control unit 10 is determining the elapse of one week. Setting of the boiling temperature Th (S402): The hybrid control unit 10 sets a plurality of boiling temperatures Th. As described above, the hybrid control unit 10 sets a plurality of boiling temperatures Th as parameters for calculating a plurality of running costs RC.

[0087] Calculation of power consumption of HP unit 6 (S403): The hybrid control unit 10 calculates the power consumption of the HP unit 6 during the calculation period using a plurality of boiling temperatures Th as parameters. Calculation of gas consumption of gas water heater 8 (S404): The hybrid control unit 10 calculates the gas consumption that satisfies the hot water supply demand during the calculation period of the gas water heater 8. Calculation of the minimum value or a value in the vicinity of the running cost RC (S405): The hybrid control unit 10 calculates the minimum value or a value in the vicinity of the running cost RC using the power consumption and gas consumption corresponding to a plurality of boiling temperatures Th.

[0088] Selection of boiling temperature Th (S406): The hybrid control unit 10 selects the boiling temperature Th corresponding to the minimum value or a value in the vicinity of the running cost RC from a plurality of boiling temperatures Th. Automatic switching of boiling temperature Th (S407): If the selected boiling temperature Th is different from the boiling temperature Th currently set in the HP unit 6, the hybrid control unit 10 switches to the latest boiling temperature Th. That is, automatic switching of the boiling temperature Th is executed without user operation.

[0089] <Presentation of information> FIG. 16 shows information presentation by the information presentation screen 58 of the remote control unit 12. This information presentation includes a usage status confirmation menu screen 180 (A in FIG. 16), a hot water menu screen 182 (B in FIG. 16), a period selection menu screen 184 (C in FIG. 16), a usage amount presentation screen 186 (D in FIG. 16), a usage amount presentation screen 188 (E in FIG. 16), and a usage amount presentation screen 190 (F in FIG. 16). On the usage status confirmation menu screen 180, as shown in A of FIG. 16, it is possible to select the upper tank temperature, hot water, and electricity, and the usage status in the selected item can be confirmed. In this example, hot water is selected. On the hot water menu screen 182, as shown in B of FIG. 16, it is possible to select the usage amount and graph (usage amount trend), and the selected item is displayed.

[0090] On the period selection menu screen 184, as shown in C of FIG. 16, it is possible to select data for one day, one week, one month, or one year. On the usage display screens 186 and 188, as shown in D and E of FIG. 16, the hot water usage for a specific month is displayed. On the usage display screen 190, as shown in F of FIG. 16, the hot water usage for the same month of the previous year is displayed.

[0091] FIG. 17 shows the presentation of usage information by the information presentation screen 58 of the remote control unit 12. This information presentation includes a usage trend screen 192 (A of FIG. 17) and a usage trend screen 194 (B of FIG. 17). On the usage trend screen 192, as shown in A of FIG. 17, as an example, a graph display showing the trend of hot water usage in the second week (this week) of a specific month is presented. On the usage trend screen 194, as shown in B of FIG. 17, as an example, a graph display showing the trend of hot water usage in the first week (last week) of a specific month is presented.

[0092] <Effects of the Second Embodiment> According to this second embodiment, any of the following effects can be obtained. (1) The same effects as those of the first embodiment can be obtained, and the running cost RC and the boiling temperature Th can be easily confirmed by the information presentation screen 58 of the information presentation unit 42. (2) Since the relationship between the selection of the boiling temperature Th and the running cost RC can be clarified, the user can be convinced of the running cost RC and the boiling temperature Th, and a highly convenient hybrid water supply system 2 can be realized. (3) If the running cost RC and the boiling temperature Th are presented on the information presentation unit 42, a highly convenient system can be configured.

[0093] 〔Other Embodiments〕 The hybrid water supply system of the present disclosure includes the following modification examples. (1) In the above-described embodiment, the HP unit 6 is used as the first hot water supply means, but a heat source other than the HP unit 6 may be used. (2) In the above-described embodiment, the gas water heater 8 is provided with the secondary heat exchanger 96, but a configuration including only the primary heat exchanger 94 may be used. (3) Regarding the information presentation processing steps and information processing, when the mode information acquisition unit 26 acquires the automatic switching mode information, if there is no operation performance information, a step of shifting to the manual switching mode, and a hot water supply demand information acquisition unit acquiring hot water supply demand information representing the hot water supply demand during the execution of the manual switching mode, and a cost information acquisition unit acquiring running cost information representing the running cost calculated for each different boiling temperature using the hot water supply demand information based on the operation performance information for a certain period may be included. In this case, the information presentation unit 42 may include a step of presenting display information indicating that the automatic switching mode is selected during the execution of the manual switching mode after the automatic switching mode information is selected.

[0094] As described above, the most preferred embodiments of the technology of the present disclosure have been described. The present disclosure is not limited to the above description. Based on the gist of the disclosure described in the claims or disclosed in the form for carrying out the invention, various modifications and changes are possible for those skilled in the art. Needless to say, such modifications and changes are included in the scope of the present disclosure.

Industrial Applicability

[0095] According to the hybrid hot water supply system of the present disclosure, regardless of whether manual switching or automatic switching of the boiling temperature is selected, a boiling temperature that can minimize the running cost RC can be obtained, and automatic switching to this boiling temperature becomes possible, enabling the construction of a highly convenient hybrid hot water supply system.

Explanation of Reference Numerals

[0096] 2 Hybrid hot water supply system 4 Hot water storage unit 6 HP unit 8 Gas water heater 10 Hybrid control unit 12 Remote control unit 14 Hot water storage tank 16 Hot water storage control unit 18 Heat exchange unit 20 HP control unit 22 Heat exchange unit 24 Hot water supply control unit 26 Mode information acquisition unit 28 Hot water supply demand information acquisition unit 30 Cost information acquisition unit 32 Boiling temperature selection unit 34 Boiling temperature switching unit 36 Operation information acquisition unit 38 Information display control unit 40 Information input unit 42 Information display unit 44 Remote control unit 46 Information input screen 48 Manual switching mode unit 50 Boiling temperature input unit 50-1 65°C unit 50-2 75°C unit 50-3 85°C unit 50-4 Hot water supply temperature linkage unit 52 Automatic switching mode unit 54 Efficiency information input unit 56 Unit price information input unit 58 Information display screen 60 Boiling temperature information unit 62 Mode information unit 64 Cost information unit 66 Hot water supply demand information unit 68 Operation information unit 68-1 HP unit operation time unit 68-2 Gas water heater operation time unit 68-3 Total operation time unit 70 Elapsed time information unit 72 Water supply pipe 74 Overpressure relief valve 76 Hot water supply pipe 78 Heat medium circulation path 80 Air heat exchanger 82 Compressor 84 Heat medium heat exchanger 86 Expansion valve 87 Air 88 First hot water circulation path 88-1 Forward pipe 88-2 Return pipe 88-3 Bypass pipe 90 Second hot water circulation path 90-1 Forward pipe 90-2 Return pipe 92 Burner 94 Primary heat exchanger 96 Secondary heat exchanger 98-1, 98-2, 98-3, 98-4, 98-5, 98-6, 98-7, 98-8, 98-9, 98-10, 98-11, 98-12, 98-13, 98-14, 98-15, 98-16, 98-17 Temperature sensor 100 Hot water outlet pipe 102 Mixing valve 104 Bypass pipe 106 Flow sensor 108 Circulation pump 110 Switching valve 112 Circulation pump 114 Fan 116 Flow sensor 118 Hot water supply button 120 Hot water supply lamp 122 Constant boiling button 124 Constant boiling lamp 126 Schedule operation button 128 Schedule operation lamp 130 Opening / closing lid 132 Setting operation part 134 Boiling setting button 136 Quick button 138 Business setting button 140 Rest setting button 142 Usage status confirmation button 144 Menu button 146 Hot water supply temperature setting button 148 Decision button 150 Return button 152 Processor 154 Memory unit 156 Input / output unit (I / O) 158 Operation information DB 160 Operation information file 162 Date and time unit 164 Operation period unit 166 Calculation period unit 168 Hot water storage unit 168-1 Feed water temperature unit 168-2 Hot water output unit 168-3 Hot water supply load unit 170 HP unit 170-1 COP unit 170-2 Operation time unit 170-3 Power consumption unit 170-4 Charge unit price unit 170-5 Cost information unit 172 Gas water heater unit 172-1 Operation time unit 172-2 Gas consumption unit 172-3 Charge unit price unit 172-4 Cost information unit 174 Hot water supply and demand ratio unit 174-1 HP unit 174-2 Gas water heater unit 176 Running cost unit 176-1 Heating temperature unit 176-2 Minimum value unit 176-11 65°C unit 176-12 75°C unit 176-13 85°C unit 176-14 Hot water supply temperature linkage unit 178 Heating temperature unit 180 Usage status confirmation menu screen 182 Hot water menu screen 184 Period selection menu screen 186, 188, 190 Usage display screen 192, 194 Usage trend screen

Claims

1. a step of boiling the underlayer water taken out from the hot water storage unit to a predetermined temperature by a first hot water supply means and storing the hot water in the hot water storage unit; When hot water is dispensed, the intermediate layer water in the hot water storage unit is heated to a predetermined temperature by a second hot water supply means, and the heated water is stored in the hot water storage unit, thereby supplementing the heat deficiency required for dispensing hot water at the set temperature by the second hot water supply means, and dispensing hot water from the hot water storage unit; A step in which a mode information acquisition unit acquires information indicating a manual switching mode or an automatic switching mode of a heating temperature to be set in the first hot water supply means; When the mode information acquisition unit acquires information on the automatic switching mode, if there is no operation record information, a step of transitioning to the manual switching mode; an operation information acquisition unit acquiring operation information of the first hot water supply means and the second hot water supply means during execution of the manual switching mode; A cost information acquisition unit acquires information representing a running cost calculated for each different heating temperature using the operation result information for a certain period of time; A step of selecting a boiling temperature that is a minimum value or a value close to the minimum value of the running cost by a boiling temperature selection unit; A step in which a boiling temperature switching unit switches the boiling temperature of the first hot water supply means using the boiling temperature in the manual switching mode or the automatic switching mode; A hybrid hot water supply method comprising:

2. The hybrid hot water supply method according to claim 1, further comprising a step of switching the boiling temperature set in the first hot water supply means by the boiling temperature switching unit based on the selected boiling temperature.

3. The hybrid hot water supply method according to claim 1 or 2, further comprising a step in which an information presentation unit presents one or more of the manual switching mode, the automatic switching mode, the running cost, and the boiling temperature.

4. The hybrid hot water supply method according to any one of claims 1 to 3, further comprising a step in which an information presentation unit presents display information indicating that the automatic switching mode is selected while the manual switching mode is being executed after the automatic switching mode is selected.

5. A hybrid hot water supply system in which a first hot water supply means boils bottom water taken out of a hot water storage unit to a predetermined temperature and stores the hot water in the hot water storage unit, and when hot water is to be dispensed, a second hot water supply means boils middle water in the hot water storage unit to a predetermined temperature and stores the hot water in the hot water storage unit, thereby supplementing the second hot water supply means with the heat deficiency required for dispensing hot water at a set temperature, and dispensing hot water from the hot water storage unit, A mode information acquisition unit that acquires information on a manual switching mode or an automatic switching mode of a heating temperature to be set in the first hot water supply means; an operation information acquisition unit that acquires operation information of the first hot water supply means and the second hot water supply means during execution of the manual switching mode to which the automatic switching mode has been transitioned, if there is no operation record information when the mode information acquisition unit acquires information on the automatic switching mode; a cost information acquisition unit that acquires information representing a running cost calculated for each different heating temperature using the operation result information for a certain period of time; A boiling temperature selection unit that selects a boiling temperature that is the minimum value or a value close to the minimum value of the running cost; a boiling temperature switching unit that switches the boiling temperature of the first hot water supply means using the boiling temperature in the manual switching mode or the automatic switching mode; A hybrid hot water system comprising:

6. The hybrid hot water supply system according to claim 5 , further characterized in that the boiling temperature switching unit switches the boiling temperature set in the first hot water supply means based on the selected boiling temperature.

7. The hybrid hot water supply system according to claim 5 or claim 6, further comprising an information display unit that displays any one or more of the manual switching mode, the automatic switching mode, the running cost, and the heating temperature.

8. The hybrid hot water supply system of claim 7 further comprises an information input unit which is displayed on the information input screen of the information presentation unit, and which is further characterized in that it comprises a mode input unit for inputting information on the manual switching mode or automatic switching mode of the boiling temperature to be set in the first hot water supply means on the information input screen, and a boiling temperature input unit which can select from a plurality of boiling temperatures.

9. A program to be executed by a computer used in a hybrid hot water supply system in which a first hot water supply means heats bottom water taken out of a hot water storage unit to a predetermined temperature and stores the hot water in the hot water storage unit, and when hot water is to be dispensed, a second hot water supply means heats middle water in the hot water storage unit to a predetermined temperature and stores the hot water in the hot water storage unit, thereby supplementing the second hot water supply means with the heat deficiency required for dispensing hot water at a set temperature, and dispensing hot water from the hot water storage unit, A function of acquiring information indicating a manual switching mode or an automatic switching mode of a heating temperature to be set in the first hot water supply means; a function of switching to the manual switching mode when no operation record information exists when the automatic switching mode information is acquired; a function of acquiring operation information of the first hot water supply means and the second hot water supply means during execution of the manual switching mode; A function of acquiring information representing a running cost calculated for each different heating temperature using the operation performance information for a certain period of time; A function of acquiring selection information of a boiling temperature that is the minimum value or a value close to the minimum value of the running cost; A function of switching the heating temperature of the first hot water supply means using the heating temperature in the manual switching mode or the automatic switching mode; A program for causing the computer to execute the above.

10. 10. The program according to claim 9, further comprising causing the computer to execute a function of switching the boiling temperature set in the first hot water supply means based on the selected boiling temperature.

11. The program according to claim 9 or claim 10, further comprising causing the computer to execute a function of causing an information presentation unit to present any one or more of the manual switching mode, the automatic switching mode, the running cost, and the boiling temperature.

12. The program according to any one of claims 9 to 11, further comprising: a program for causing the computer to execute a function of causing an information presentation unit to present display information indicating that the automatic switching mode has been selected while the manual switching mode is being executed after the automatic switching mode has been selected.

13. A recording medium having the program according to any one of claims 9 to 12 recorded thereon.

14. The bottom water taken out from the hot water storage unit is heated to a predetermined temperature by the first hot water supply means. A hybrid control unit for storing hot water in the hot water storage unit, and for dispensing hot water, heating a middle layer water of the hot water storage unit to a predetermined temperature by a second hot water supply means and storing the hot water in the hot water storage unit, thereby supplementing a heat deficiency required for dispensing hot water at a set temperature by the second hot water supply means, and dispensing hot water from the hot water storage unit, A mode information acquisition unit that acquires information indicating a manual switching mode or an automatic switching mode of a heating temperature to be set in the first hot water supply means; an operation information acquisition unit that acquires operation information of the first hot water supply means and the second hot water supply means during execution of the manual switching mode to which the automatic switching mode has been transitioned, if there is no operation record information when the mode information acquisition unit acquires information on the automatic switching mode; a cost information acquisition unit that acquires information representing a running cost calculated for each different heating temperature using the operation result information for a certain period of time; A boiling temperature selection unit that selects boiling temperature information that is the minimum value or a value close to the minimum value of the running cost; a boiling temperature switching unit that switches the boiling temperature of the first hot water supply means using the boiling temperature in the manual switching mode or the automatic switching mode; A hybrid control unit comprising:

15. 15. The hybrid control unit according to claim 14, further comprising: a boiling temperature switching unit that switches the boiling temperature set in the first hot water supply means based on the selected boiling temperature.

16. A remote control unit equipped with the hybrid control unit according to claim 14 or claim 15 or linked to the hybrid control unit, A remote control unit comprising an information presentation unit that presents information on any one or more of the manual switching mode, the automatic switching mode, the running cost, and the heating temperature.

17. The remote control unit described in claim 16 further comprises an information input unit, which is displayed on an information input screen of the information presentation unit, and which is characterized in that it comprises a mode input unit for inputting information on the manual switching mode or the automatic switching mode to be set in the first hot water supply means on the information input screen, and a boiling temperature input unit capable of selecting from a plurality of boiling temperatures.

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