Water heater

Abstract

To accurately calculate a consumed amount of neutralizer agent even when the temperature of hot water passing through a secondary heat exchanger can become high, and to give a notification of a maintenance period for a neutralizer at an appropriate timing.SOLUTION: A hot water supply heater 1 includes: a water supply temperature sensor 10 and a heating low-temperature sensor 31 which detect a temperature of water supplied to a hot water supply secondary heat exchanger 7B and a heating secondary heat exchanger 22B; a neutralizer 60 to which drain generated in the hot water supply secondary heat exchanger 7B and the heating secondary heat exchanger 22B is introduced and neutralizer agent is stored; and a controller 70 which controls combustion of a hot water supply burner 6 and a heating burner 21 based on water supply temperatures detected by the water supply temperature sensor 10 and the heating low-temperature sensor 31. The controller 70 can execute neutralizer agent consumption amount determination control which calculates a combustion amount integrated value based on an amount of combustion and a water supply temperature during combustion of the hot water supply burner 6 and the heating burner 21, and determines a consumed amount of neutralizer agent by comparing the calculated combustion amount integrated value with a predefined determination value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a latent heat recovery water heater including a primary heat exchanger and a secondary heat exchanger. [Background technology]

[0002] In a latent heat recovery water heater, drainage is generated when heat is exchanged between the water passing through the secondary heat exchanger and the combustion exhaust gas from the gas burner. A neutralizer is therefore provided to neutralize and discharge the generated drainage. The neutralizer is filled with a predetermined amount of neutralizing agent, but the amount of neutralizing agent decreases with use. Therefore, a controller monitors the remaining amount of neutralizing agent and issues a notification prompting the user to replenish the neutralizing agent or replace the neutralizer when necessary. For example, Patent Document 1 discloses an invention in which, each time the water heater is operated, the controller calculates the product of the amount of heat generated by combustion and the combustion time, and when the calculated value reaches a predetermined reference value, issues a notification indicating that it is time for maintenance, such as replenishing the neutralizing agent or replacing the neutralizer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-337631 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, if a water heater has both a hot water heating unit and a space heating unit that circulates hot water between the hot water heating unit and an external heating terminal, when the space heating unit is operating, relatively high-temperature hot water passes through the secondary heat exchanger. As a result, the secondary heat exchanger may not recover much latent heat and may not generate any drain. However, in the invention of Patent Document 1, even in such a case, the controller calculates the product of the combustion heat amount of the gas burner and the combustion time, and increases the integrated value.As a result, even if the neutralizer is not actually used and there is still a sufficient amount remaining, the integrated value may reach the reference value and an alert may be issued for the time to perform maintenance on the neutralizer.

[0005] Therefore, the present disclosure aims to provide a water heating device that can accurately calculate the consumption of neutralizing agent even if the temperature of hot water passing through the secondary heat exchanger becomes high, and can notify the user at an appropriate time when it is time to perform maintenance on the neutralizing device. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides a gas burner, a primary heat exchanger that recovers mainly sensible heat from the combustion exhaust of the gas burner to heat the water passing through; a secondary heat exchanger that recovers mainly latent heat from the combustion exhaust gas to heat the water that flows through the secondary heat exchanger; a supply water temperature detection means for detecting the temperature of water supplied to the secondary heat exchanger; a neutralizer into which drain generated in the secondary heat exchanger is introduced and into which a neutralizing agent is accommodated; and a controller that controls combustion of the gas burner based on the feedwater temperature detected by the feedwater temperature detection means. The controller is characterized in that it is capable of calculating a cumulative value of the amount of drainage generated based on actual information when the gas burner is burned and the supply water temperature, and is capable of executing neutralizer consumption determination control that determines the amount of neutralizer consumed by comparing the calculated cumulative value with a predetermined determination value. Another aspect of the present disclosure is characterized in that, in the above configuration, the performance information is the actual combustion amount of the gas burner, and the cumulative value is an accumulated combustion amount value obtained by accumulating a corrected combustion amount obtained by multiplying the actual combustion amount by a coefficient that is preset according to the feedwater temperature. [Effects of the Invention]

[0007] According to the present disclosure, even if the temperature of hot water passing through the secondary heat exchanger becomes high, the consumption amount of neutralizer can be calculated accurately, and notification of the time for maintenance of the neutralizer can be performed at an appropriate time. Therefore, premature replenishment of neutralizer or replacement of the neutralizer can be prevented. According to another aspect of the present disclosure, in addition to the above effects, the cumulative value is an integrated combustion amount value obtained by accumulating a corrected combustion amount obtained by multiplying the actual combustion amount by a coefficient preset according to the feedwater temperature, so that an integrated combustion amount value corresponding to the consumption of neutralizing agent can be accurately obtained based on the actual combustion amount of the gas burner. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic circuit diagram of a hot water heater. [Figure 2] 10 is a flowchart of a neutralizing agent consumption amount determination control. [Figure 3] 10 is a graph showing the relationship between the supply water temperature and the coefficient. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. 1 is a schematic circuit diagram of a hot water heater 1, which is an example of a hot water supply device. The hot water heater 1 includes a hot water heating section 2, a room heating section 3, and a bath heating section 4. The hot water heating section 2 includes, within the hot water combustion chamber 5, a plurality of hot water burners 6, 6..., and a hot water primary heat exchanger 7A and a hot water secondary heat exchanger 7B that heat water passing through the inside with the combustion exhaust of the hot water burner 6. The hot water burner 6 is an example of a gas burner of the present disclosure. The hot water primary heat exchanger 7A and the hot water secondary heat exchanger 7B are examples of a primary heat exchanger and a secondary heat exchanger of the present disclosure. The inlet of the hot water supply primary heat exchanger 7A and the outlet of the hot water supply secondary heat exchanger 7B are connected by piping outside the hot water supply combustion chamber 5. A water supply pipe 8 is connected to the inlet of the hot water supply secondary heat exchanger 7B. The water supply pipe 8 is provided with a hot water supply amount sensor 9 that detects the amount of water flowing and a water supply temperature sensor 10 that detects the water supply temperature. An external water pipe (not shown) is connected to the water inlet of the water supply pipe 8. The water supply temperature sensor 10 is an example of a water supply temperature detection means of the present disclosure. An outlet of the hot water supply primary heat exchanger 7A is connected to a hot water outlet pipe 11. An external pipe (not shown) connected to the hot water outlet of the hot water outlet pipe 11 is provided with a hot water tap.

[0010] A bypass pipe 12 that bypasses the hot water primary and secondary heat exchangers 7A, 7B is connected between the water supply pipe 8 and the hot water outlet pipe 11. A hot water inner barrel sensor 13 that detects the outlet temperature of the hot water primary heat exchanger 7A is provided upstream of the connection point of the bypass pipe 12 to the hot water outlet pipe 11. A hot water outlet sensor 14 that detects the outlet hot water temperature is provided downstream of the connection point of the bypass pipe 12 to the hot water outlet pipe 11. Gas pipe 15, which supplies gas to hot water burners 6, branches off for each hot water burner 6, and each branch pipe is provided with a hot water switching solenoid valve 16. Gas pipe 15 before branching is provided, from upstream, with a main gas solenoid valve 17 and a hot water gas proportional valve 18. Below hot water combustion chamber 5, a combustion fan 19 is provided to supply combustion air to each hot water burner 6.

[0011] The heating unit 3 includes, within a heating combustion chamber 20, a plurality of heating burners 21, 21, and a heating primary heat exchanger 22A and a heating secondary heat exchanger 22B that heat hot water passing through the interior with the combustion exhaust of the heating burners 21. The heating burner 21 is an example of a gas burner of the present disclosure. The heating primary heat exchanger 22A and the heating secondary heat exchanger 22B are examples of a primary heat exchanger and a secondary heat exchanger of the present disclosure. A heating high-temperature forward pipe 23 is connected to the outlet of the heating primary heat exchanger 22A, and a heating return pipe 24 is connected to the inlet of the heating secondary heat exchanger 22B. A heating high-temperature forward pipe 23 is provided on the outlet side of the heating primary heat exchanger 22A with a heating high-temperature sensor 25 that detects the outlet temperature of hot water from the heating primary heat exchanger 22A.

[0012] A heating circulation pipe 26 is connected between the outlet of the heating secondary heat exchanger 22B and the inlet of the heating primary heat exchanger 22A. An expansion tank 27 and a heating circulation pump 28 are provided in the heating circulation pipe 26. A water supply branch pipe 29 branching off from the water supply pipe 8 is connected to the expansion tank 27. A make-up water solenoid valve 30 is provided in the water supply branch pipe 29 to switch the water supply to the expansion tank 27. A heating low-temperature sensor 31 is provided in the expansion tank 27 to detect the return temperature of hot water to the heating primary heat exchanger 22A. The heating low-temperature sensor 31 is an example of a water supply temperature detection means of the present disclosure. An external high-temperature circulation pipe 32 is connected between the appliance outlet of the heating high-temperature supply pipe 23 and the appliance inlet of the heating return pipe 24. A high-temperature radiator 33 is provided in the high-temperature circulation pipe 32. The high-temperature radiator 33 is, for example, a heating fan that blows hot air into a bathroom or a changing room. A high-temperature side thermal valve 34 is provided in the high-temperature radiator 33.

[0013] A heating low-temperature supply pipe 35 is connected to the heating circulation pipe 26. The heating low-temperature supply pipe 35 is branched downstream into multiple (six in this case) branch pipes 36, 36... Each branch pipe 36 is provided with a low-temperature side thermal valve 37. The high temperature side thermal valve 34 and the low temperature side thermal valve 37 have a well-known structure in which a thermal element expands when current is applied to open the valve, and the thermal element releases heat when current is stopped to close the valve. External low-temperature circulation pipes 38 are connected between the appliance outlets of some or all of the six branch pipes 36 and the high-temperature circulation pipes 32 downstream of the high-temperature radiators 33. Each low-temperature circulation pipe 38 is provided with a low-temperature radiator 39. The low-temperature radiators 39 are, for example, floor heaters for a changing room or the like. The gas pipe 15 branches off to the heating unit 3 side, and then branches off again for each heating burner 21, and each branch pipe is provided with a heating switching solenoid valve 40. The lower part of the heating combustion chamber 20 is connected to the hot water supply combustion chamber 5, so that combustion air can be supplied from a combustion fan 19.

[0014] The bath heating section 4 has a bath heat exchanger 45. A bath heating pipe 46 is inserted into the bath heat exchanger 45 and connected between the heating high-temperature forward pipe 23 and the heating return pipe 24. A reheating flow control valve 47 is provided on the bath heating pipe 46 upstream of the bath heat exchanger 45. The bath heat exchanger 45 is connected to a bath supply pipe 48 and a bath return pipe 49. The bath supply pipe 48 is provided with a bath supply temperature sensor 50 that detects the supply temperature. The bath return pipe 49 is provided with a bath return temperature sensor 51 that detects the return temperature. The bath return pipe 49 is provided with a bath circulation pump 52. The fixture outlet of the bath supply pipe 48 and the fixture inlet of the bath return pipe 49 are each connected to the bathtub 53 via external pipes. A drop pipe 54 branching off from the hot water outlet pipe 11 downstream of the bypass pipe 12 is connected to the bath return pipe 49. A drop solenoid valve 55 and a drop flow rate sensor 56 are provided in the drop pipe 54. By opening the drop solenoid valve 55, hot water tapped into the hot water outlet pipe 11 of the hot water supply heating unit 2 can be supplied to the bathtub 53 via the drop pipe 54 and the bath return pipe 49.

[0015] A neutralizer 60 is provided within the appliance. A drain inlet pipe 61 is connected to the neutralizer 60, which introduces drain generated in the hot water supply secondary heat exchanger 7B and the heating secondary heat exchanger 22B in the hot water supply combustion chamber 5 and the heating combustion chamber 20. The neutralizer 60 is provided with a water level electrode 62 and is capable of containing a predetermined amount of neutralizing agent. A drain discharge pipe 63 is connected to the neutralizer 60, which discharges drain neutralized by the neutralizing agent. The drain discharge pipe 63 is connected to an overflow pipe 64 connected to the expansion tank 27, so that the drain can be discharged to the outside via the overflow pipe 64. A controller 70 is provided outside the appliance. Controller 70 has a well-known configuration including a CPU and memory connected to the CPU, and is electrically connected to kitchen remote control 71, bathroom remote control 72, and heating remote control 73, to which detection signals from each sensor are input. Controller 70 follows instructions from each remote control 71, 72, 73 and programs stored in memory to open and close each solenoid valve and thermal valve, adjust the opening of the proportional valve, control the rotation speed of the fan motor, and perform other operations such as controlling the outlet hot water temperature, filling bathtub 53 with water, and controlling the heating.

[0016] In the hot water heater 1 configured as above, normal hot water supply is first performed as follows. When the hot water tap is opened and water is allowed to flow into the appliance, and this flow is detected by the hot water volume sensor 9, the controller 70 rotates the combustion fan 19 for a predetermined time to discharge the combustion exhaust gas accumulated in the hot water combustion chamber 5 (pre-purge). Then, the controller 70 opens the main gas solenoid valve 17 of the gas pipe 15 and each hot water switching solenoid valve 16, and opens the hot water gas proportional valve 18 to a predetermined opening to supply gas to each hot water burner 6, and also operates the igniter to ignite the hot water burners 6, 6, etc. As a result, latent heat is recovered between the water passing through the hot water secondary heat exchanger 7B and the water passing through the hot water primary heat exchanger 7A, and then hot water is dispensed from the hot water tap via the hot water outlet pipe 11.

[0017] The controller 70 monitors the hot water outlet temperature using the hot water outlet sensor 14 on the hot water outlet pipe 11, and controls the opening and closing of the hot water switching solenoid valve 16 and adjusts the opening of the hot water gas proportional valve 18 so that the hot water temperature becomes the set temperature instructed by the kitchen remote control 71 or the bathroom remote control 72, while also continuously changing the amount of air by controlling the rotation speed of the combustion fan 19. When the hot water tap is closed, the controller 70 confirms that the signal from the hot water volume sensor 9 has stopped, closes the main gas solenoid valve 17 and the hot water switching solenoid valve 16 to extinguish the hot water burner 6, and rotates the combustion fan 19 for a predetermined time to perform post-purge.

[0018] On the other hand, when the hot water filling switch provided on the kitchen remote control 71 or bathroom remote control 72 is pressed, the controller 70 opens the drop-in solenoid valve 55 on the drop-in pipe 54 to allow water to flow through the hot water heating unit 2, ignites the hot water burner 6, and supplies hot water from the hot water outlet pipe 11 to the bathtub 53 via the drop-in pipe 54 and the bath return pipe 49. When it is confirmed that the amount of water detected by the drop-in flow rate sensor 56 provided on the drop-in pipe 54 has reached the set amount, the controller closes the drop-in solenoid valve 55 to stop the water flow, extinguishes the hot water burner 6 to end the hot water filling, and activates the bath circulation pump 52 to circulate the hot water in the bathtub 53 within the bath heating unit 4. The controller 70 then monitors the circulating water temperature using the bath supply temperature sensor 50 and the bath return temperature sensor 51. If the temperature falls below the warming temperature set by the kitchen remote control 71 or the bathroom remote control 72, the controller 70 ignites the heating burner 21 to rotate the combustion fan 19, and also activates the heating circulation pump 28 to open the reheating flow control valve 47. At the same time, the bath circulation pump 52 is activated. Then, the hot water in the piping of the heating unit 3 circulates through the heating secondary heat exchanger 22B, the heating circulation piping 26, the heating primary heat exchanger 22A, the bath heating piping 46, and the heating return piping 24, and the hot water in the bathtub 53 circulates through the bath return piping 49, the bath heat exchanger 45, and the bath supply piping 48, thereby exchanging heat in the bath heat exchanger 45. As a result, the hot water in the bathtub 53 is reheated and kept warm.

[0019] When the heating switch for the high-temperature radiator 33 provided on the heating remote control 73 is pressed, the heating unit 3 starts combustion of the heating burner 21 and operates the heating circulation pump 28 to open the high-temperature side thermal valve 34. Then, the hot water in the piping is heated while circulating through the heating secondary heat exchanger 22B, the heating circulation piping 26, the heating primary heat exchanger 22A, the heating high-temperature forward piping 23, the high-temperature circulation piping 32, the high-temperature radiator 33, and the heating return piping 24 in this order. Furthermore, when the heating switch for the low-temperature radiator 39 provided on the heating remote control 73 is pressed, the heating burner 21 starts combustion and the heating circulation pump 28 is operated, closing the high-temperature side thermal valve 34 and the reheating flow control valve 42 and opening the low-temperature side thermal valve 37. When this is done, the hot water in the piping is heated while circulating through the heating secondary heat exchanger 22B, the heating circulation piping 26, the heating low-temperature supply piping 35, the branch piping 36, the low-temperature circulation piping 38, the low-temperature radiator 39, and the heating return piping 24 in this order.

[0020] When combustion operation is performed in each heating section in this manner, drainage generated in hot water supply secondary heat exchanger 7B and heating secondary heat exchanger 22B is collected in neutralizer 60, neutralized with a neutralizing agent, and discharged. For this reason, controller 70 calculates and integrates the combustion amounts of hot water supply burner 6 and heating burner 21, determines the amount of neutralizing agent consumed based on the integrated combustion amount, and notifies the user of the need for maintenance. This neutralizing agent consumption determination control will be described below with reference to the flowchart in Figure 2. First, in step (hereinafter referred to as "S") 1, when combustion operation is started in any of the heating sections, the controller 70 calculates and accumulates the combustion amount of the hot water burner 6 and / or heating burner 21 every predetermined time (for example, 1 second) in S2, and stores the accumulated combustion amount value. First, the actual combustion amount is calculated by adding an FB control amount based on the deviation between the actual hot water outlet temperature and the set temperature to an FF control amount calculated using the current flow rate, water supply temperature, set temperature, and thermal efficiency using a well-known method. When the hot water supply burner 6 and the heating burner 21 are burning simultaneously, the actual combustion amount is the sum of the combustion amounts of each burner. The actual combustion amount is an example of performance information when the gas burner of the present disclosure is burning.

[0021] Here, the actual combustion amount is multiplied by a coefficient (multiplication factor) that is set in advance according to the feedwater temperature at the time of calculation to calculate a corrected combustion amount, and this corrected combustion amount is integrated to obtain an integrated combustion amount value. The integrated combustion amount value is an example of the accumulated value of the drain generation amount of the present disclosure. This coefficient is set, for example, as shown in Figure 3, based on the results of verifying the correlation between the feedwater temperature and the amount of drain generated in advance through tests, etc. Here, the lower the feedwater temperature, the larger the coefficient, and if the feedwater temperature is 60°C or higher, the coefficient is set to 0, as it is assumed that almost no drain is generated. On the hot water burner 6 side, the corrected combustion amount is calculated based on the feed water temperature obtained from feed water temperature sensor 10. On the heating burner 21 side, the corrected combustion amount is calculated based on the feed water temperature obtained from heating low temperature sensor 31. The coefficients may be the same for hot water burner 6 and heating burner 21, or may be different for each burner.

[0022] Next, in S3, it is determined whether the cumulative combustion amount is equal to or greater than a first predetermined determination value, which is a cumulative combustion amount corresponding to a predetermined consumption amount of the neutralizing agent. If the cumulative combustion amount is equal to or greater than the first judgment value, a first notification is made in S4. This first notification is, for example, a notification that it is time for maintenance to replenish the neutralizing agent on the display unit of one or more remote controls. If the cumulative combustion amount is less than the first judgment value in S3, the process returns to S1. When the neutralizing agent is replenished and a predetermined reset operation is performed by the remote controller in S5, the integrated combustion amount value and the first notification are reset in S6, and the process returns to S1. On the other hand, if the combustion operation continues without the reset operation in S5, it is determined in S7 whether the cumulative combustion amount is equal to or greater than a preset second determination value. This second determination value is greater than the first determination value and corresponds to a predetermined consumption amount that requires replacement of the neutralizer 60. If the cumulative combustion amount is equal to or greater than the second judgment value, a second notification is issued in S8. This second notification is, for example, a notification displayed on one or more remote controllers indicating that it is time for maintenance to replace the neutralizer 60. If the cumulative combustion amount is determined to be less than the second judgment value in S7, the process returns to S5 and waits for the neutralizer to be replenished and the reset operation to be performed. When the neutralizer 60 is replaced and a predetermined reset operation is performed by the remote controller in S9, the integrated combustion amount value and the second notification are reset in S10, and the process returns to S1.

[0023] On the other hand, if the combustion operation continues without performing the reset operation in S9, it is determined in S11 whether the integrated combustion amount is equal to or greater than a preset appliance stop determination value. This appliance stop determination value is greater than the second determination value and corresponds to a predetermined consumption amount that requires immediate shutdown of the appliance. If the cumulative combustion amount is equal to or greater than the appliance stop judgment value, the combustion operation of all heating units is stopped in S12, and an abnormality is notified by display on the remote control or by voice in S13. If the cumulative combustion amount is determined to be less than the appliance stop judgment value in S11, the process returns to S9 and waits for the neutralizer 60 to be replaced and reset. When a predetermined reset operation is performed by remote control in S14 after the neutralizer is replenished or the neutralizer 60 is replaced, the integrated combustion amount value and the abnormality notification are reset in S15, and the process returns to S1.

[0024] In this way, the hot water heater 1 of the above form includes a hot water burner 6 and a heating burner 21, a hot water primary heat exchanger 7A and a heating primary heat exchanger 22A that recover mainly sensible heat from the combustion exhaust of the hot water burner 6 and the heating burner 21 to heat the water passing through, a hot water secondary heat exchanger 7B and a heating secondary heat exchanger 22B that recover mainly latent heat from the combustion exhaust to heat the water passing through, a water supply temperature sensor 10 and a heating low-temperature sensor 31 that detect the temperature of the water supplied to the hot water secondary heat exchanger 7B and the heating secondary heat exchanger 22B, a neutralizer 60 into which drain generated in the hot water secondary heat exchanger 7B and the heating secondary heat exchanger 22B is introduced and which contains a neutralizing agent, and a controller 70 that controls the combustion of the hot water burner 6 and the heating burner 21 based on the water supply temperature detected by the water supply temperature sensor 10 and the heating low-temperature sensor 31. The controller 70 calculates an accumulated combustion amount value based on the actual combustion amount and the water supply temperature when the hot water burner 6 and the heating burner 21 are burned, and is capable of performing neutralizer consumption determination control to determine the amount of neutralizer consumed by comparing the calculated accumulated combustion amount value with a predetermined determination value.

[0025] According to this configuration, even if the temperature of the hot water passing through the hot water supply secondary heat exchanger 7B and the heating secondary heat exchanger 22B becomes high, the consumption amount of the neutralizer can be calculated accurately, and notification of the maintenance time for the neutralizer 60 can be performed at an appropriate timing. Therefore, it is not necessary to replenish the neutralizer or replace the neutralizer 60 too early.

[0026] The actual information is the actual combustion amount of the hot water burner 6 and the heating burner 21, and the cumulative value is the cumulative combustion amount value obtained by multiplying the actual combustion amount by a coefficient set in advance according to the water supply temperature. Therefore, based on the actual combustion amounts of the hot water supply burner 6 and the heating burner 21, it is possible to accurately obtain the integrated value of the combustion amount corresponding to the consumption amount of the neutralizing agent.

[0027] Modifications of the present disclosure will be described below. In the above embodiment, the corrected combustion amount is calculated by multiplying the actual combustion amount by a coefficient, and the corrected combustion amount is integrated. However, the integrated value of the actual combustion amount may be multiplied by a coefficient to obtain the integrated combustion amount value. The coefficients are not limited to the above settings and can be changed as appropriate. The coefficients may not be set for each supply water temperature, but may be set for each predetermined range of supply water temperatures, for example. The timing for obtaining the actual combustion amount is not limited to every second as in the above embodiment, and can be changed as appropriate. The judgment values ​​to be compared with the cumulative combustion amount are not limited to the three described above. For example, two judgment values ​​may be used: either the first or second judgment value and the appliance stop judgment value. If two judgment values ​​are used, the second judgment value for determining when to replace the neutralizer and the appliance stop judgment value, the amount of neutralizer loaded can be reduced, thereby lightening the product weight.

[0028] In the above embodiment, the actual combustion amount of the gas burner is used as the performance information when the gas burner is burned, but the performance information may be the combustion time of the gas burner. In this case, the actual combustion time is corrected based on the feedwater temperature, and the cumulative value of the corrected combustion time is calculated. The amount of neutralizing agent consumed can be determined by comparing the calculated cumulative value with the determination value. In the above embodiment, a hot water heater / heating device including a hot water heater, a space heater, and a bath heater is exemplified, but the present disclosure can also be applied to a hot water heater that does not include a bath heater but includes a hot water heater and a space heater, or a hot water heater that does not include a space heater but includes a hot water heater and a bath heater. The present disclosure can also be applied to a hot water heater that includes only a hot water heater. For example, the temperature of the water supply can be increased by using sunlight to heat the water supply, so there is a practical benefit in applying the present disclosure. [Explanation of symbols]

[0029] 1··Hot water heater, 2··Hot water heating section, 3··Heating heating section, 4··Bath heating section, 6··Hot water burner, 7A··Hot water primary heat exchanger, 7B··Hot water secondary heat exchanger, 8··Water supply pipe, 10··Water supply temperature sensor, 11··Hot water outlet pipe, 21··Heating burner, 22A··Heating primary heat exchanger, 22B··Heating secondary heat exchanger, 31··Heating low temperature sensor, 60··Neutralizer, 70··Controller.

Claims

1. A gas burner and a primary heat exchanger that recovers mainly sensible heat from the combustion exhaust of the gas burner to heat the water passing through; a secondary heat exchanger that recovers mainly latent heat from the combustion exhaust gas to heat the water that flows through the secondary heat exchanger; a supply water temperature detection means for detecting the temperature of water supplied to the secondary heat exchanger; a neutralizer into which drain generated in the secondary heat exchanger is introduced and into which a neutralizing agent is accommodated; a controller that controls combustion of the gas burner based on the feedwater temperature detected by the feedwater temperature detection means, The controller calculates a cumulative value of drain generation based on actual information when the gas burner is burned and the water supply temperature, and is capable of executing neutralizing agent consumption determination control to determine the amount of neutralizing agent consumed by comparing the calculated cumulative value with a predetermined determination value.

2. The water heater according to claim 1, wherein the performance information is the actual combustion amount of the gas burner, and the cumulative value is an accumulated combustion amount value obtained by multiplying the actual combustion amount by a coefficient preset according to the water supply temperature.

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