Storage type water heater and hot water system

Abstract

To provide a storage type water heater and a hot water system that can propose bathing conditions for comfortable sleep to a bathing person who has a relatively short time from the start of bathing to bedding.SOLUTION: A storage type water heater comprises: input means for receiving input of a bedding scheduled time; display means; and computation means for computing, in a first mode, a bathing start time and a bathing time recommended to a bath taking person based upon condition values of the bedding scheduled time and a hot water temperature when the input means receives the input of the bedding scheduled time at a reception time. When a recommended bathing start time computed in the first mode or a second mode is a time before the reception time, the computation means updates, in the second mode, a current condition value of the hot water temperature to a condition value larger by a prescribed increase width, and computes a bathing start time and a bathing time to be recommended to the bath taking person, and when the second mode is computed, the display means displays a computation result of the second mode.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a storage type hot water heater and a hot water supply system. [Background technology]

[0002] Patent Document 1 discloses a bathing system that supports bathers in bathing so that their core body temperature rises by an appropriate amount, thereby enabling them to get a good night's sleep. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-106964 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the bathing system described in Patent Document 1 suggests shortening the bathing time to prevent a rise in core body temperature if it determines that there is not enough time between starting bathing and going to bed. As a result, this bathing system cannot suggest bathing conditions for a comfortable sleep to a user who has a relatively short time between starting bathing and going to bed.

[0005] The present disclosure has been made to solve the above-mentioned problems. The purpose of the present disclosure is to provide a hot water storage type hot water supply device and a hot water supply system that can propose bathing conditions that will allow a person to get a comfortable sleep, even if the time between the start of bathing and bedtime is relatively short. [Means for solving the problem]

[0006] The hot water storage type hot water supply device according to the present disclosure is a hot water supply device that fills a bathtub with hot water, and includes an input means for receiving input of a planned bedtime from a person who plans to bathe, a display means for displaying information to the person who plans to bathe, and a calculation means for calculating, as a first mode, a recommended bathing start time and bathing duration for the person who plans to bathe, based on the planned bedtime and condition values ​​of the water temperature, when the input means receives the input of the planned bedtime at the reception time. If the recommended bathing start time calculated in the first mode or the second mode is a time before the reception time, the calculation means performs a second mode. The current condition value of the hot water temperature is updated to a condition value that is larger by a specified increase amount, and a recommended bathing start time and bathing duration for the person planning to take a bath are calculated based on the updated condition value of the hot water temperature and the planned bedtime, and the display means displays the recommended bathing start time and bathing duration calculated in the first mode if the recommended bathing start time calculated in the first mode is later than the reception time, and displays the recommended bathing start time and bathing duration calculated in the second mode if the recommended bathing start time calculated in the first mode is earlier than the reception time.

[0007] The hot water supply system of the present disclosure comprises an input means for accepting input of a planned bedtime from a person planning to bathe, a display means for displaying information to the person planning to bathe, and a calculation means for, when the input means accepts input of a planned bedtime at a reception time, calculating, in a first mode, a recommended bathing start time and bathing duration for the person planning to bathe based on the planned bedtime and a condition value for water temperature; if the recommended bathing start time calculated in the first mode or the second mode is before the reception time, the calculation means updates, in a second mode, the current condition value for water temperature to a condition value that is larger by a specified increase amount, and calculates, based on the updated condition value for water temperature and the planned bedtime, a recommended bathing start time and bathing duration for the person planning to bathe; if the recommended bathing start time calculated in the first mode is later than the reception time, the display means displays the recommended bathing start time and bathing duration calculated in the first mode; and if the recommended bathing start time calculated in the first mode is before the reception time, the display means displays the recommended bathing start time and bathing duration calculated in the second mode. [Effects of the Invention]

[0008] According to the present disclosure, bathing conditions that allow a comfortable sleep can be proposed even to a person who plans to take a bath and has a relatively short time between the time they start bathing and the time they go to bed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram of a hot water supply system according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing an example of a recommended relationship between bathing time and a planned bedtime from a bathing start time. [Figure 3] FIG. 3 is a functional block diagram of a control device 36 according to the first embodiment. [Figure 4] 4 is a flowchart showing an example of an operation performed in the hot water supply system in the first embodiment. [Figure 5] 6 is a flowchart showing another example of the operation performed in the hot water supply system in the first embodiment. [Figure 6] 6 is a flowchart showing another example of the operation performed in the hot water supply system in the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals. Duplicate descriptions of these parts will be appropriately simplified or omitted.

[0011] Embodiment 1 Fig. 1 is a configuration diagram of a hot water supply system according to the first embodiment. Fig. 2 is a diagram showing an example of a recommended relationship between bathing time and the time from the bath start time to the planned bedtime. Fig. 3 is a functional block diagram of a control device 36 according to the first embodiment. Fig. 4 is a flowchart showing an example of an operation performed by the hot water supply system according to the first embodiment. Figs. 5 and 6 are flowcharts showing other examples of an operation performed by the hot water supply system according to the first embodiment.

[0012] As shown in FIG. 1, the hot water supply system S includes a storage type hot water supply device 35. The storage type hot water supply device 35 is equipped with a tank unit 33, an HP (heat pump) unit 7, and a remote control device 44. The HP unit 7 and the tank unit 33 are connected via an HP supply pipe 14, an HP return pipe 15, and electrical wiring (not shown). The tank unit 33 has a built-in control device 36. The operation of the various valves, pumps, etc. equipped in the tank unit 33 and the HP unit 7 is controlled by the control device 36, which is electrically connected to them.

[0013] The remote control device 44 has the function of accepting user operations such as operation commands and changes to setting values. The remote control device 44 is an example of an operation means or user interface device. The control device 36 and the remote control device 44 are connected via wired or wireless communication to enable bidirectional data communication. The remote control device 44 is equipped with a display unit 44a that displays information such as the status of the storage type hot water heater 35, an operation unit 44b such as a switch operated by the user, and a speaker, microphone, etc. (not shown). The remote control device 44 may be installed in the kitchen. The remote control device 44 may be installed in the bathroom. The storage type hot water heater 35 may be equipped with multiple remote control devices 44. The remote control device 44 may notify the user of information by voice, sound, etc.

[0014] The HP unit 7 is an example of a heating means for heating water. The HP unit 7 includes a refrigerant circuit in which a compressor 1, a water-refrigerant heat exchanger 3, an expansion valve 4, and an air heat exchanger 6 are connected in a ring shape by refrigerant piping 5. The HP unit 7 operates a heat pump cycle using this refrigerant circuit. In the water-refrigerant heat exchanger 3, heat is exchanged between the refrigerant compressed by the compressor 1 and water guided from the tank unit 33, thereby heating the water. Note that the water-refrigerant heat exchanger 3 may also be configured to exchange heat between the refrigerant compressed by the compressor 1 and water supplied directly from a water source such as a tap.

[0015] The tank unit 33 contains the following various components and piping. The hot water storage tank 8 stores hot water. Inside the hot water storage tank 8, temperature stratification can occur, with the upper part being hotter and the lower part being colder, due to differences in water density caused by temperature. The hot water storage tank 8 is not limited to being composed of a single tank as shown in the figure, but may also be composed of multiple tanks connected in series. In the following explanation, reference will be made to the height direction, i.e., the vertical position, of the hot water storage tank 8, but if the hot water storage tank 8 is composed of multiple tanks connected in series, the vertical position will be specified within the entire hierarchy from the top tank to the bottom tank.

[0016] A third water supply pipe 9c is connected to a water inlet 8a provided at the bottom of the hot water storage tank 8. Water supplied through the first water supply pipe 9a from a water source such as a tap is adjusted to a specified pressure by a pressure reducing valve 31 and then flows into the hot water storage tank 8 through the third water supply pipe 9c. A hot water inlet outlet 8d for supplying hot water stored in the hot water storage tank 8 to the outside of the hot water supply device 35 and a hot water inlet outlet 8e that can communicate with the HP return pipe 15 are provided at the top of the hot water storage tank 8. Multiple hot water temperature sensors 41, 42, and 43 are attached at different heights on the surface of the hot water storage tank 8. The hot water temperature sensor 41 is located at the same height as the medium-temperature water inlet outlet 8f or at a height close to the medium-temperature water inlet outlet 8f. The hot water temperature sensor 42 is located higher than the hot water temperature sensor 41. The hot water temperature sensor 43 is located lower than the hot water temperature sensor 41. The control device 36 and the like can grasp the amount of remaining hot water or the amount of stored heat in the hot water storage tank 8 by detecting the temperature distribution of the hot water in the hot water storage tank 8 using these hot water storage temperature sensors 41, 42, 43.

[0017] Control device 36 controls the start and stop of the operation of boiling hot water in hot water storage tank 8 by HP unit 7, depending on the amount of hot water remaining in hot water storage tank 8 or the amount of heat stored therein. Boiling operation proceeds as follows: Low-temperature water flowing out from the bottom of hot water storage tank 8 is guided to HP unit 7 via HP supply piping 14 and heated in water-refrigerant heat exchanger 3 to become high-temperature water. This high-temperature water then flows into hot water storage tank 8 via HP return piping 15 through hot water inlet outlet 8e at the top of hot water storage tank 8. By performing this boiling operation, high-temperature water is stored in hot water storage tank 8 from the upper layer, and this high-temperature water layer gradually becomes thicker. Control device 36 terminates boiling operation when the amount of hot water or heat stored in hot water storage tank 8, as detected by hot water temperature sensors 41, 42, and 43, exceeds a predetermined amount.

[0018] The tank unit 33 houses a first circulation pump 12 and a bath heat exchanger 20. The first circulation pump 12 is a pump for circulating hot and cold water through various pipes and is installed on the first water supply pipe 13a. The bath heat exchanger 20 exchanges heat between the tank water supplied from the hot water storage tank 8 and the bath water from the bathtub 30. The bath heat exchanger 20 is installed in the bath supply pipe 27 and the bath return pipe 28 connected to the bathtub 30. A bath supply temperature sensor 37 is installed in the bath supply pipe 27 to detect the temperature of the bath water flowing out of the bath heat exchanger 20. A bath circulation pump 29 serving as a second circulation pump for circulating the bath water, a bath return temperature sensor 38 to detect the temperature of the bath water leaving the bathtub 30, a water level sensor 46 to detect the water level in the bathtub 30, and a flow switch 47 to detect the circulation of water in the bath return pipe 28. For example, the water level can be used to detect when a person is bathing in the bathwater.

[0019] Furthermore, a micro-bubble generator 48 is installed in the bath return pipe 28. For example, the micro-bubble generator 48 is a device with an ejector structure, and as a bubble generating means, it takes in air to generate micro-bubbles that have a warming effect in the bath water in the bath circulation circuit.

[0020] The three-way valve 11 is a flow path switching means having inlet ports a and b and an outlet port c. The three-way valve 11 is configured to be able to switch the flow path between two paths, a, c, and bc.

[0021] The four-way valve 16 is a flow path switching means having inlet ports b and d and outlet ports a and c. The four-way valve 16 is configured to be able to switch the flow path among four paths: ba, da, bc, and dc.

[0022] The four-way valve 18 is a flow path switching means having an inlet port a and outlet ports b, c, and d. The four-way valve 18 is configured to be able to switch the flow path among three paths ab, ac, and ad.

[0023] The tank unit 33 has a low-temperature pipe 10, a first water supply pipe 13a, a first hot water pipe 17a, a second hot water pipe 17b, a third hot water pipe 19a, a fourth hot water pipe 19b, and a fifth hot water pipe 19c. The low-temperature pipe 10 connects a water outlet 8b provided at the bottom of the hot water storage tank 8 to port a of a three-way valve 11. The first water supply pipe 13a connects port c of the three-way valve 11 to the inlet of a first circulation pump 12. The HP supply pipe 14 connects the outlet of the first circulation pump 12 to the inlet of the HP unit 7. The HP return pipe 15 connects the outlet of the HP unit 7 to port b of a four-way valve 16. The first hot water pipe 17a connects port a of the four-way valve 16 to port a of a four-way valve 18. The second hot water pipe 17b connects the c port of the four-way valve 16 to a water inlet 8c provided at the bottom of the hot water storage tank 8. The third hot water pipe 19a connects the b port of the four-way valve 18 to a hot water inlet outlet 8e at the top of the hot water storage tank 8. The fourth hot water pipe 19b connects the d port of the four-way valve 18 to a hot water inlet outlet 8d provided at the top of the hot water storage tank 8. The fifth hot water pipe 19c connects the c port of the four-way valve 18 to a hot water inlet 8g provided between the top and middle of the hot water storage tank 8.

[0024] The first tank circulation pipe 20a connects the hot water inlet 8e to the tank water inlet of the bath heat exchanger 20. The second tank circulation pipe 20c connects the tank water outlet of the bath heat exchanger 20 to port b of the three-way valve 11. The second water supply pipe 13b branches off from the HP supply pipe 14 between the first circulation pump 12 and the inlet of the HP unit 7 and is connected to port d of the four-way valve 16.

[0025] Furthermore, the tank unit 33 has a medium-temperature pipe 79, a first water supply pipe 9a, a second water supply pipe 9b, a third water supply pipe 9c, a fourth water supply pipe 9d, a hot water mixing valve 22, a bath mixing valve 23, a medium-temperature water switching valve 78, a hot water supply pipe 24, a bath pipe 25, a return pipe 20b, and a check valve 50. The first water supply pipe 9a, the second water supply pipe 9b, the third water supply pipe 9c, and the fourth water supply pipe 9d are included in the water supply pipeline 9.

[0026] The medium-temperature water switching valve 78 is a flow path switching means having inlet ports a and b and an outlet port c. The medium-temperature water switching valve 78 is configured to be able to switch the flow path between two paths, a and bc.

[0027] The hot water supply mixing valve 22 is a mixing means having a first inlet, a second inlet, and an outlet. The bath mixing valve 23 is a mixing means having a first inlet, a second inlet, and an outlet.

[0028] One end of the first water supply pipe 9a is connected to a water source such as a tap. The other end of the first water supply pipe 9a is connected to the second water supply pipe 9b and the third water supply pipe 9c via a pressure reducing valve 31. The second water supply pipe 9b is connected to port a of the medium-temperature water switching valve 78. The medium-temperature water pipe 79 connects the medium-temperature water inlet outlet 8f, located in the middle of the hot water storage tank 8, to port b of the medium-temperature water switching valve 78. The return pipe 20b branches off from the middle of the second tank circulation pipe 20c and is connected to the middle of the medium-temperature water pipe 79. A check valve 50 is installed on the return pipe 20b. The check valve 50 obstructs the flow from the middle of the hot water storage tank 8 toward the bottom of the hot water storage tank 8. This reliably prevents heat from leaking from the middle of the hot water storage tank 8 to the bottom of the hot water storage tank 8. One end of the fourth water supply pipe 9d is connected to port c of the medium-temperature water switching valve 78. The other end of the fourth water supply pipe 9d is connected to the first inlets of the hot water supply mixing valve 22 and the bath mixing valve 23. One end of the high-temperature pipe 21 is connected to the hot water inlet outlet 8d of the hot water storage tank 8. The other end of the high-temperature pipe 21 is connected to the second inlets of the hot water supply mixing valve 22 and the bath mixing valve 23.

[0029] The medium-temperature water switching valve 78 is used by switching between two flow path states: a first flow path state in which the second water supply pipe 9b and the fourth water supply pipe 9d are connected, and a second flow path state in which the medium-temperature pipe 79 and the fourth water supply pipe 9d are connected. When the medium-temperature water switching valve 78 is set to the first flow path state, low-temperature water supplied from the water source passes through the second water supply pipe 9b and the fourth water supply pipe 9d and is supplied to the hot water mixing valve 22 and the bath water mixing valve 23. The first flow path state of the medium-temperature water switching valve 78 corresponds to a "low-temperature water use state." When the medium-temperature water switching valve 78 is set to the second flow path state, medium-temperature water supplied from the hot water storage tank 8 through the medium-temperature pipe 79 passes through the fourth water supply pipe 9d and is supplied to the hot water mixing valve 22 and the bath water mixing valve 23. The second flow path state of the medium-temperature water switching valve 78 corresponds to a "medium-temperature water use state."

[0030] The hot water supply mixing valve 22 adjusts the flow rate ratio between high-temperature water supplied from the hot water storage tank 8 through the high-temperature pipe 21 and low-temperature water or medium-temperature water supplied from the fourth water supply pipe 9d, thereby producing hot water at a set temperature set by the user using the remote control device 44, and causing the hot water to flow into the hot water supply pipe 24. The hot water whose temperature has been adjusted by the hot water supply mixing valve 22 is supplied from the hot water supply pipe 24 via the hot water tap 34 to a faucet (not shown) such as a shower or a faucet used by the user.

[0031] Bath mixing valve 23 can produce hot water at the set temperature set by the user via remote control device 44 by adjusting the flow rate ratio between high-temperature water supplied from hot water storage tank 8 via high-temperature piping 21 and low-temperature or medium-temperature water supplied from fourth water supply piping 9d. The hot water adjusted to the set temperature by bath mixing valve 23 flows through bath flow sensor 45 and bath solenoid valve 26 installed in bath piping 25, and then through bath supply piping 27 into bathtub 30.

[0032] The control device 36 determines the completion of filling the bathtub 30 based on information detected by the bath flow rate sensor 45 and water level sensor 46, and controls the amount of bathwater in the bathtub 30 upon completion of filling so that it is equal to the amount of hot water set by the user via the remote control device 44. Thus, the hot water storage tank 8, bath mixing valve 23, bath flow rate sensor 45, water level sensor 46, and various piping constitute a means for filling the bathtub 30 with hot water. The hot water storage type hot water supply device 35 of this embodiment may also be capable of automatic bath operation. When automatic bath operation is set via the remote control device 44, the control device 36 warms, heats, cools, adds hot water, or adds hot water as needed after filling is complete, so that the temperature and amount of bathwater in the bathtub 30 remain at the temperature and amount set via the remote control device 44. Adding hot water or raising the temperature may be achieved by directly flowing hot water from the hot water storage tank 8 into the bathtub 30. The temperature of the bath water may be maintained and increased by a bath heat exchanger 20.

[0033] The hot water supply system S further includes an external communication device 80. The external communication device 80 is capable of communicating with the control device 36. The external communication device 80 serves as a communication interface device and is capable of communicating with a mobile terminal 81 carried by a person who plans to bathe in the bathtub 30 via the network N. For example, the mobile terminal 81 is a device such as a smartphone, tablet, or laptop. A dedicated application is installed on the mobile terminal 81, and at least part of the control of the hot water supply system S is performed by the dedicated application. Note that the hot water supply system S may be provided with a cloud server (not shown), and the external communication device 80 may be capable of communicating with the cloud server. In this case, at least part of the control of the hot water supply system S is performed on the cloud server, and the mobile terminal 81 may be capable of communicating with the cloud server via a dedicated application or a web browser.

[0034] The mobile terminal 81 has, as its functions, a display unit 81a that displays information and an input unit 81b that accepts input of information. The display unit 81a is the screen of the mobile terminal 81. For example, the input unit 81b is a button on the mobile terminal 81 or a button icon displayed on the display unit 81a.

[0035] The control device 36, which is the control means of the hot water supply system S, calculates bathing conditions that will cause the core body temperature of the human body to rise and fall during the time period from the start of bathing to bedtime in order to improve the quality of sleep of the person planning to take a bath. An example of this will be described below.

[0036] It is generally believed that people find it easier to fall asleep when their core body temperature is falling, and that going to bed after a certain amount of time has passed since the core body temperature dropped, rather than immediately after, leads to comfortable, high-quality sleep. Furthermore, the human body functions to lower core body temperature that has risen due to external factors such as bathing, and often functions so that the temperature after the drop is lower than the temperature that rose. In other words, the factors necessary to improve sleep quality are to raise the core body temperature by bathing and to go to bed a certain amount of time after finishing bathing.

[0037] On the other hand, if the bath water is too hot, bathing will stimulate the sympathetic nervous system, causing the body to become excited, with increased blood pressure, a rapid pulse, and sweating. In this case, it is not recommended to go to bed until the excitement subsides. In this way, it is necessary to set an upper limit for the water temperature so that it does not become too hot, stimulating the sympathetic nervous system and lengthening the time it takes to go to bed.

[0038] Figure 2 is a graph showing an example of the relationship between bathing time (from start to finish) and the time that should be secured between bathing start time and planned bedtime to improve sleep quality, for each bathing water temperature. The vertical axis is the difference in time (minutes) obtained by subtracting the bathing start time from the planned bedtime. The horizontal axis is the bathing time (minutes). The relationships for water temperatures of 39°C, 40°C, 41°C, and 42°C are shown on the graph by dashed line L1, straight line L2, dashed line L3, and dashed line L4, respectively.

[0039] As the graph shows, the longer the bath time, the greater the rise in core body temperature, so it is recommended to extend the time between starting the bath and going to bed to allow sufficient time for core body temperature to drop. Even for the same bath time, the higher the water temperature, the greater the rise in core body temperature per hour, so it is recommended to extend the time between starting the bath and going to bed. For example, if the bath time is 15 minutes and the water temperature is 42°C, it is recommended to wait at least 150 minutes between starting the bath and going to bed.

[0040] In the hot water supply system S, the operation unit 44b of the remote control device 44 or the input unit 81b of the mobile terminal 81, which are input means, accepts input of the planned bedtime from the person who will take a bath later. The control device 36, which is a calculation means, calculates a recommended bathing start time and bathing duration based on preset calculation conditions and the accepted input planned bedtime. The display control function of the control device 36 displays the calculated recommended bathing start time and bathing duration on the display unit 44a of the remote control device 44 or the display unit 81a of the mobile terminal 81, which are display means. In this way, the person who will take a bath later can obtain from the hot water supply system S conditions related to the bathing start time and bathing duration to improve the quality of their sleep.

[0041] As an example, the calculation of the recommended bathing start time is performed based on the relationship shown in FIG. 2. For example, if the set water temperature included in the calculation conditions is 40°C, a 10-minute bath suggests going to bed 90 to 120 minutes after starting the bath. In this case, the calculation means calculates the bathing time as 10 minutes and any time between 90 and 120 minutes after the planned bedtime as the recommended bathing start time, and displays this on the display means. Note that the length selected within the range of 90 to 120 minutes may be determined by other conditions. Also, for example, if the criterion for determining that the time of reception of the planned bedtime input and the planned bedtime are sufficiently far apart is met, the calculation means sets the bathing time to 15 minutes, which is longer than 10 minutes. In this case, since the condition is for bathing at 40°C for 15 minutes, the calculation of the recommended bathing start time is 120 to 150 minutes before the planned bedtime.

[0042] The calculation means may change the condition value of the water temperature included in the calculation conditions. For example, if the condition value of the water temperature is changed to 41°C, the bathing time is set to 8 minutes to generate the same body temperature increase effect as with a water temperature of 40°C. In other words, the calculation is performed so that the bathing time is shorter than that of 40°C. This calculation shifts the bathing start time to a later time.

[0043] Next, the control device 36 will be described in more detail using Figures 3 and 4. The control device 36 has, as its functions, an acquisition unit 36a, a hot water supply control unit 36b, a condition calculation unit 36c, a determination unit 36d, a condition update unit 36e, and a display control unit 36f. The acquisition unit 36a acquires information from each device in the hot water supply system S. The hot water supply control unit 36b controls the supply of hot water to the bathtub 30 by the hot water storage type hot water supply device 35 as a hot water filling means and a heat retention means. For example, the hot water supply control unit 36b controls the amount and temperature of bath water filled in the bathtub 30.

[0044] The condition calculation unit 36c, the determination unit 36d, and the condition update unit 36e function as calculation means for calculating a recommended bathing start time, etc. The condition calculation unit 36c, in either the first or second mode, calculates a recommended bathing start time and bathing duration based on preset calculation conditions, updated calculation conditions, and the planned bedtime of the person planning to bathe, as received via the input means. The determination unit 36d compares various values ​​to make various determinations, such as whether the calculated recommended bathing start time is later than the reception time of the planned bedtime. In the second mode, the condition update unit 36e increases the water temperature condition value included in the calculation conditions by a specified increase amount, and sets the updated water temperature condition value as the calculation condition. The display control unit 36f, as display control means, controls the information displayed on the display means.

[0045] 4 is a flowchart showing the operation of the control device 36 to calculate the recommended bathing start time and display it on the display means. For example, this flowchart starts when the person who plans to take a bath inputs the planned bedtime from the input means.

[0046] In step S001, the input means accepts input of a planned bedtime from the person planning to take a bath. The acquisition unit 36a acquires information about the planned bedtime from the input means, correlating it with the input reception time. If bathwater is filled in the bathtub 30 at the reception time, the acquisition unit 36a acquires the detected water temperature at the reception time from the bath inlet temperature sensor 37 or bath outlet temperature sensor 38, which is a water temperature detection means.

[0047] Then, in step S002, the calculation means performs calculations in the first mode. Specifically, the condition calculation unit 36c calculates a recommended bathing start time and bathing duration in the first mode based on the planned bedtime acquired in step S001, the water temperature condition value included in the calculation conditions, and the like. Here, if the water temperature at the reception time was acquired in step S001, the initial water temperature condition value in the first mode is set to the detected water temperature at the acquired reception time. If the detected water temperature value has not been acquired because the bath is not filled with water, for example, the initial water temperature condition value may be set to the current water temperature set by the input means or may be set to a preset initial water temperature.

[0048] Then, in step S003, the determination unit 36d determines whether the recommended bathing start time calculated in the first mode is later than the reception time, i.e., whether the person scheduled to take a bath can start bathing at the recommended bathing start time.

[0049] If, in step S003, the recommended bathing start time in the first mode is later than the accepted time, the operation of step S004 is performed. In step S004, the display means displays the recommended bathing start time and bathing duration in the first mode under the control of display control unit 36f. The operation of the flowchart then ends. In step S004, the display means may display a message asking whether or not to operate storage-type hot water supply device 35, which serves as the bath filling means, so that the bath is filled at the recommended bathing start time displayed. If an input indicating that operation should be performed is received in response to the message, i.e., if an input indicating that a first-mode bath will be performed is accepted, hot water supply control unit 36b controls the hot water supply as the recommended bathing start time approaches or at the bathing start time so that bathwater 30 is filled with water at the water temperature condition value used in the first mode at the recommended bathing start time in the first mode.

[0050] If the recommended bathing start time in the first mode is before the reception time in step S003, step S005 is performed as the first operation in the second mode. In step S005, the condition update unit 36e increases the water temperature condition value included in the current calculation conditions by a specified increase amount to set the updated water temperature condition value. For example, the increase amount is set to 1.0°C.

[0051] Then, in step S006, the condition calculation unit 36c calculates the recommended bathing start time and bathing duration in the second mode based on the planned bedtime acquired in step S001, the updated water temperature condition value included in the calculation conditions, etc. In other words, because the previously calculated recommended bathing start time has already passed, it is determined that bathing cannot begin at this recommended bathing start time, and the water temperature condition value is increased so that the bathing duration will be shorter, and the recommended bathing start time, etc. are calculated again.

[0052] Then, in step S007, the decision unit 36d determines whether the updated bath temperature condition value exceeds the specified upper limit temperature. That is, it determines whether the bath temperature condition value used to calculate the recommended bathing start time in the previous second mode exceeded the upper limit temperature. For example, the upper limit temperature is set to a temperature such as 42°C that would wake the human body.

[0053] If the updated hot water temperature condition value is equal to or lower than the specified upper limit temperature in step S007, the operation of step S008 is performed. In step S008, the determination unit 36d determines whether the recommended bathing start time calculated in step S006 (second mode) is after the reception time. In other words, it determines whether the person scheduled to take a bath can start bathing at the recommended bathing start time in the second mode.

[0054] In step S008, if the recommended bathing start time calculated in step S006 is not later than the reception time, that is, is before the reception time, the operations from step S005 onwards are repeated.

[0055] If the calculated recommended bathing start time in step S008 is later than the accepted time, the operation of step S009 is performed. In step S009, the display control unit 36f controls the display unit to display the recommended bathing start time and bathing duration last calculated in the second mode. The operation of the flowchart then ends. In step S009, the display unit may display a prompt asking whether or not to operate the various components of the hot water storage type hot water supply device 35, which serves as the bath filling unit, so that the bath is filled at the displayed recommended bathing start time. If an input indicating that operation should be performed is received in response to the prompt, i.e., if an input indicating that a bath is to be taken in the second mode is received, the hot water supply control unit 36b controls the hot water supply as the bathing start time approaches or at the recommended bathing start time last calculated in the second mode, so that the bathtub 30 is filled with bathwater at the water temperature condition value used in the calculation. For example, if bathwater is already filled in the bathtub 30, the updated condition value for the water temperature should be higher than the detected value for the water temperature used in the first mode calculation. Therefore, the hot water supply control unit 36b starts the operation of raising the water temperature in the bathtub 30 using the bath heat exchanger 20, which is the heat retention means, so that the water temperature reaches the updated condition value for the water temperature.

[0056] If the updated bath temperature condition value exceeds the specified upper limit temperature in step S007, step S010 is performed. In step S010, the display control unit 36f controls the display means to display a message indicating that there is no recommended bathing start time available, and to display at least one of the recommended bathing start time and bathing duration calculated in step S002 (first mode) for reference. In other words, because a long bath at high temperature will not produce the expected warm bathing effect, display of the bathing start time and bathing duration in the second mode is prohibited in step S010. Furthermore, the display device may display a message indicating that the optimal bathing start time for the day has passed. The operation of the flowchart then ends.

[0057] The operations from step S005 to step S009 are the operations in the second mode. In this way, in the second mode, recalculation is repeated so that the water temperature condition value increases within the upper temperature limit range until the new recommended bathing start time becomes the time when bathing is possible.

[0058] After the operations of the flowchart, various notifications are displayed on the display device by the display control unit 36f. If the recommended bathing start time and bathing duration in the first mode are displayed on the display means by the operation of step S004 on that day, the recommended bathing start time and bathing duration, which are the results of the calculation in the first mode, are again displayed at a time that is the specified notification time before the displayed recommended bathing start time in the first mode. If the recommended bathing start time and bathing duration in the second mode are displayed on the display means by the operation of step S009 on that day, the recommended bathing start time and bathing duration, which are the results of the calculation in the second mode, are again displayed at a time that is the notification time before the displayed recommended bathing start time in the second mode. The notification time may be set to any time, including 0 (e.g., 15 minutes). Alternatively, multiple notification times may be set, and this notification may be made multiple times equal to the number of set notification times.

[0059] Furthermore, if the recommended bathing start time and bathing duration in the first mode are displayed on the display means by the operation of step S004 on that day, and if the bathtub 30 has not been filled with water by the recommended bathing start time in the first mode, specifically, at a time that is the specified preparation time before the recommended bathing start time, the display means will display information recommending that the bathtub be filled.If the recommended bathing start time in the second mode is displayed on the display means by the operation of step S009 on that day, and if the bathtub 30 has not been filled with water by the recommended bathing start time in the second mode, specifically, at a time that is the preparation time before the recommended bathing start time, the display means will display information recommending that the bathtub be filled.

[0060] Furthermore, if the bather does not start bathing even after the recommended bathing start time presented in the first or second mode has passed, the calculation means considers the current time to be the reception time and performs calculations in the second mode. The content displayed on the display means by this calculation is the same as the content of the operation in the flowchart. For example, if the water temperature condition value exceeds the upper limit temperature as a result of the calculation in the second mode, the display means will display a message that there is no recommended bathing start time that can be presented, along with the recommended bathing start time and bathing duration calculated in the first mode.

[0061] The condition calculation unit 36c may also reflect the warm bathing effect of bubbles generated in the bathwater by the bubble generating means in the calculation of the recommended bathing start time in the first and second modes. Because bubbles enhance the warm bathing effect, even with the same water temperature and bathing time, the rise in the core body temperature of the human body increases. Therefore, the condition calculation unit 36c can perform calculations under conditions that include a shorter bathing time, thereby further delaying the recommended bathing start time. Below, using Figures 5 and 6, we will explain an example in which the warm bathing effect of bubbles is conditionally reflected in the calculation in the second mode.

[0062] Steps S001 to S007 in the flowcharts shown in Figures 5 and 6 are the same as those in the flowchart shown in Figure 4. If in step S007 the condition value for the updated hot water temperature is equal to or lower than the specified upper limit temperature, the operation of step S101 is performed. In step S101, it is determined whether the condition value for the updated hot water temperature is equal to or higher than the specified bubble temperature. The bubble temperature is a bathing temperature that can reflect the hot bath effect of bubbles in the calculation. The bubble temperature may be set to any value equal to or lower than the upper limit temperature, for example, it may be set to the same value as the upper limit temperature.

[0063] If the updated water temperature condition value is equal to or higher than the bubble temperature in step S101, the operation of step S102 is performed. In step S102, the condition calculation unit 36c performs second-mode calculations by recalculating the recommended bathing start time and bathing duration based on the planned bedtime, the updated water temperature condition value in the calculation conditions, and the warm bath effect of the bubbles.

[0064] If the updated hot water temperature condition value is lower than the air bubble temperature in step S101, or after step S102, the operations from step S008 onwards are performed. Steps S008 to S010 in the flowcharts shown in Figures 5 and 6 are the same as those in the flowchart shown in Figure 4.

[0065] If bathing is performed under the conditions of the recommended bathing start time and bathing duration calculated in step S102, the hot water supply control unit 36b may automatically operate the fine bubble generator 48 at the recommended bathing start time. Also, it may be possible to select whether or not to generate bubbles in order to obtain the warm bath effect caused by the bubbles.

[0066] According to the first embodiment described above, the hot water supply system S includes a storage-type hot water supply device 35, input means, and display means. The storage-type hot water supply device 35 also includes a remote control device 44, which functions as input means and display means. The storage-type hot water supply device 35 includes a control device 36, which functions as a calculation means. In the prior art, for example, for a bather who returns home late at night and has a short time before falling asleep, a bathing time that prioritizes not raising the bather's core body temperature has been suggested to avoid waking up due to an excessive rise in core body temperature. This may imply that the bather will not be able to take a bath that allows for comfortable sleep, and may not meet the bather's needs. In the hot water supply system S and storage-type hot water supply device 35 of the first embodiment, if the recommended bathing start time calculated in the first mode as in the conventional method falls before the reception time, calculation in the second mode is performed. In the second mode, calculation is performed to increase the water temperature condition value, thereby shortening the bathing time and delaying the recommended bathing start time. As a result of the calculation in the second mode, bathing conditions that will change the deep body temperature of the person scheduled to take the bath can be presented, and the person scheduled to take the bath can fall asleep at the scheduled bedtime they entered after bathing, resulting in a good quality, comfortable sleep.In this way, bathing conditions that will help a person to get a comfortable sleep can be presented even for people who have a relatively short time between starting their bath and going to bed.

[0067] The condition value for the water temperature in the first mode may be the detected temperature of the bath water in the bathtub 30 at the time of reception. This prevents the condition value for the water temperature used in the first mode from being lower than the current water temperature, which would result in deviation from the intended hot bath effect. Furthermore, the person planning to take a bath no longer needs to be careful to ensure that the water temperature does not drop below the current temperature.

[0068] The hot water storage type hot water supply device 35 further includes a hot water storage tank 8 and a bath heat exchanger 20, which is a heat exchanger. The heat exchanger keeps the bath water warm or raises its temperature so that it matches the corresponding condition value at the recommended bathing start time calculated in the first or second mode. This improves convenience for the person planning to take a bath. It also allows the person planning to take a bath to more reliably take a bath under the recommended conditions.

[0069] The hot water storage type hot water supply device 35 also includes various devices that function as a bath filling unit. If the bath has not been filled by the recommended bath start time calculated in the first or second mode, the display unit displays information recommending that the bath be filled. The display unit also displays the calculated recommended bath start time and bath duration at a time that is the notification time before the recommended bath start time calculated in the first or second mode. In this way, the display unit automatically displays various displays for the person planning to bathe in conjunction with the calculated recommended bath start time. This allows the person planning to bathe to remember the information presented when they entered their planned bedtime and reaffirm the recommended bath start time. This also allows the person planning to bathe to have time to prepare in advance. As a result, bathing under the calculated conditions is encouraged.

[0070] Furthermore, if the recommended bathing start time presented in the second mode has passed and the planned bather has not yet started bathing, the calculation means will consider the current time to be the reception time and perform calculations in the second mode. This allows the planned bather to bathe more reliably under the recommended conditions. Furthermore, if the calculation in the second mode results in the water temperature condition value exceeding the upper limit temperature, the display means may display a message that there are no recommended bathing start times available and the recommended bathing start time and bathing duration calculated in the first mode.

[0071] Furthermore, if the updated water temperature condition value exceeds the upper limit temperature, the display means will display a message that there are no recommended bathing start times available. The display means may also display the recommended bathing start time and bathing duration calculated in the first mode. By displaying the recommended bathing start time and bathing duration for the planned bedtime as a reference, the person planning to take a bath can use the displayed information as a guide for the bathing start time when setting a similar planned bedtime from the next time onwards.

[0072] The hot water storage type hot water supply device 35 further includes a bubble generating means. When the updated hot water temperature condition value is equal to or higher than the bubble temperature, the calculation means performs second-mode calculations to recalculate the recommended bathing start time and bathing duration based on the planned bedtime, the updated hot water temperature condition value in the calculation conditions, and the warm bath effect of the bubbles. This allows the bathing duration to be shortened, and the recommended bathing start time to be set later.

[0073] The bubble temperature may also be equal to the upper limit temperature. If the recommended scheduled bath time calculated using the upper limit temperature as the updated water temperature condition value falls before the reception time, a message will be displayed indicating that there is no recommended scheduled bath time. By setting the bubble temperature to a value equal to the upper limit temperature, the calculation is based on a shorter bath time, increasing the likelihood that a recommended scheduled bath time will be displayed in the second mode.

[0074] At least some of the functions of control device 36 may be implemented on a cloud server. The multiple devices that make up the cloud server may each be installed in a different building. In this case, the functions of control device 36 implemented on the cloud server communicate with storage type hot water supply device 35 via a network, thereby controlling the hot water supply device.

[0075] To summarize the above explanation, possible configurations of the technology according to the present disclosure include the configurations listed below as appendices. (Appendix 1) A hot water supply device for filling a bathtub with hot water, an input means for receiving input of a planned bedtime from a person who plans to take a bath; a display means for displaying information to the person planning to take a bath; a calculation means for calculating, in a first mode, a recommended bathing start time and bathing duration for the person planning to take a bath, based on the condition value of the planned bedtime and the water temperature, when the input means receives the input of the planned bedtime at the reception time; Equipped with When the recommended bathing start time calculated in the first mode or the second mode is a time before the reception time, the calculation means updates the current hot water temperature condition value to a condition value that is larger by a specified increase amount in the second mode, and calculates a recommended bathing start time and bathing duration for the person planning to take a bath based on the updated hot water temperature condition value and the planned bedtime. The display means includes: If the recommended bathing start time calculated in the first mode is later than the reception time, the recommended bathing start time and bathing duration calculated in the first mode are displayed. If the recommended bathing start time calculated in the first mode is a time before the reception time, the recommended bathing start time and bathing duration calculated in the second mode are displayed. Storage-type hot water heater. (Appendix 2) The condition value of the hot water temperature in the first mode is the detected value of the temperature of the bath water in the bathtub at the time of reception. 10. The storage-type hot water supply device according to claim 1. (Appendix 3) A hot water storage tank and a heat exchange means for exchanging heat between the hot water stored in the hot water storage tank and the bathwater in the bathtub to raise the temperature of the bathwater in the bathtub; Further provided with When an input indicating that the person intending to take a bath in the first mode is received from the person intending to take a bath, the heat exchange means keeps the bath water in the bathtub warm so that the water temperature at the recommended bathing start time in the first mode becomes the condition value of the water temperature used in the calculation in the first mode. 2. A storage-type hot water supply device as described in Appendix 2. (Appendix 4) A hot water storage tank and a heat exchange means for exchanging heat between the hot water stored in the hot water storage tank and the bathwater in the bathtub to raise the temperature of the bathwater in the bathtub; Further provided with When an input indicating that the person intends to take a bath in the second mode is received from the person intending to take a bath, the heat exchange means raises the temperature of the bath water in the bathtub so that the temperature reaches the condition value of the water temperature used in the calculation in the second mode at the recommended bathing start time in the second mode. 10. The storage type hot water supply device according to claim 2 or 3. (Appendix 5) a bath filling means for filling the bathtub with a set amount of water and a set temperature; Further provided with If the bathtub filling means has not filled the bathtub by the recommended bathtub start time calculated in the first mode or the recommended bathtub start time calculated in the second mode, information recommending filling the bathtub is displayed on the display means. 5. A storage type hot water supply device according to any one of appendices 1 to 4. (Appendix 6) In the second mode, if the updated hot water temperature condition value exceeds a specified upper limit temperature, the display means displays a message indicating that there is no recommended bathing start time available. 6. A storage type hot water supply device according to any one of appendices 1 to 5. (Appendix 7) In the second mode, if the updated hot water temperature condition value exceeds a specified upper limit temperature, the display means displays a message that there is no recommended bathing start time that can be presented, and the recommended bathing start time and bathing duration calculated in the first mode. 6. A storage type hot water supply device according to any one of appendices 1 to 5. (Appendix 8) When it is detected that the person who will take a bath has not started bathing even though the recommended bathing start time in the first mode has passed after the first mode is displayed, the calculation means regards the current time as the reception time and calculates the recommended bathing start time and bathing duration in the second mode, In the second mode, if the updated hot water temperature condition value exceeds a specified upper limit temperature, the display means displays a message indicating that there is no recommended bathing start time available. 6. A storage type hot water supply device according to any one of appendices 1 to 5. (Appendix 9) If the updated hot water temperature condition value exceeds a specified upper limit temperature in the second mode, the display means further displays the recommended bathing start time and bathing duration calculated in the first mode. 9. The storage-type hot water supply device according to claim 8. (Appendix 10) a bubble generating means for generating bubbles in the hot water of the bathtub; Further provided with When the condition value of the updated hot water temperature is equal to or higher than the bubble temperature in the second mode, the calculation means calculates, as the second mode, a recommended bathing start time and bathing duration for the person to take a bath based on the hot bath effect of the bubbles generated by the bubble generating means, the condition value of the updated hot water temperature, and the planned bedtime. 10. A storage type hot water supply device according to any one of appendices 1 to 9. (Appendix 11) In the second mode, if the updated hot water temperature condition value exceeds a predetermined upper limit temperature, the display means displays a message that there is no recommended bathing start time that can be presented, The bubble temperature is set to a value equal to the upper limit temperature. 11. The storage-type hot water supply device according to claim 10. (Appendix 12) The display means includes: When the calculation result of the first mode is displayed, the calculation result of the first mode is displayed again at a time that is a specified notification time before the recommended bathing start time in the first mode, When the calculation result of the second mode is displayed, the calculation result of the second mode is displayed again at a time that is a specified notification time before the recommended bathing start time in the second mode. 12. A storage type hot water supply device according to any one of claims 1 to 11. [Explanation of symbols]

[0076] 1 Compressor, 3 Water-refrigerant heat exchanger, 4 Expansion valve, 5 Refrigerant piping, 6 Air heat exchanger, 7 HP (heat pump) unit, 8 Hot water storage tank, 8a Water inlet, 8b Water outlet, 8c Water inlet, 8d Hot water inlet outlet, 8e Hot water inlet outlet, 8f Medium temperature water inlet outlet, 8g Hot water inlet, 9 Water supply line, 9a First water supply pipe, 9b Second water supply pipe, 9c Third water supply pipe, 9d Fourth water supply pipe, 10 Low temperature pipe, 11 Three-way valve, 12 First circulation pump, 13a First water supply pipe, 13b Second water supply pipe, 14 HP forward pipe, 15 HP return pipe, 16 Four-way valve, 17a First hot water pipe, 17b Second hot water pipe, 18 Four-way valve, 19a Third hot water pipe, 19b Fourth hot water pipe, 19c Fifth hot water pipe, 20 Bath heat exchanger, 20a First tank circulation pipe, 20b Return pipe, 20c Second tank circulation pipe, 21 High temperature pipe, 22 Hot water supply mixing valve, 23 Bath mixing valve, 24 Hot water supply pipe, 25 Bath pipe, 26 Bath solenoid valve, 27 Bath supply pipe, 28 Bath return pipe, 29 Bath circulation pump, 30 Bathtub, 31 Pressure reducing valve, 33 Tank unit, 34 Hot water tap, 35 Storage type hot water supply device, 36 Control device, 36a Acquisition unit, 36b Hot water supply control unit, 36c Condition calculation unit, 36d Determination unit, 36e Condition update unit, 36f Display control unit, 37 Bath supply temperature sensor, 38 Bath return temperature sensor, 41 Hot water storage temperature sensor, 42 Hot water storage temperature sensor, 43 Hot water storage temperature sensor, 44 Remote control device, 44a Display unit, 44b Operation unit, 45 Bath flow rate sensor, 46 Water level sensor, 47 Flow switch, 48 Fine bubble generator, 50 Check valve, 78 Medium temperature water switching valve, 79 Medium temperature piping, 80 External communication device, 81 Mobile terminal, 81a Display unit, 81b Input unit, N Network, S Hot water supply system

Claims

1. A hot water supply device for filling a bathtub with hot water, an input means for receiving input of a planned bedtime from a person who plans to take a bath; a display means for displaying information to the person planning to take a bath; a calculation means for calculating, in a first mode, a recommended bathing start time and bathing duration for the person planning to take a bath, based on the condition value of the planned bedtime and the water temperature, when the input means receives the input of the planned bedtime at the reception time; Equipped with When the recommended bathing start time calculated in the first mode or the second mode is a time before the reception time, the calculation means updates the current hot water temperature condition value to a condition value that is larger by a specified increase amount in the second mode, and calculates a recommended bathing start time and bathing duration for the person planning to take a bath based on the updated hot water temperature condition value and the planned bedtime. The display means includes: If the recommended bathing start time calculated in the first mode is later than the reception time, the recommended bathing start time and bathing duration calculated in the first mode are displayed. If the recommended bathing start time calculated in the first mode is a time before the reception time, the recommended bathing start time and bathing duration calculated in the second mode are displayed. Storage-type hot water heater.

2. The condition value of the hot water temperature in the first mode is the detected value of the temperature of the bath water in the bathtub at the time of reception. The hot water storage type hot water supply device according to claim 1.

3. A hot water storage tank and a heat exchange means for exchanging heat between the hot water stored in the hot water storage tank and the bathwater in the bathtub to raise the temperature of the bathwater in the bathtub; Further provided with When an input indicating that the person intending to take a bath in the first mode is received from the person intending to take a bath, the heat exchange means keeps the bath water in the bathtub warm so that the water temperature at the recommended bathing start time in the first mode becomes the condition value of the water temperature used in the calculation in the first mode. The hot water storage type hot water supply device according to claim 2.

4. A hot water storage tank and a heat exchange means for exchanging heat between the hot water stored in the hot water storage tank and the bathwater in the bathtub to raise the temperature of the bathwater in the bathtub; Further provided with When an input indicating that the person intends to take a bath in the second mode is received from the person intending to take a bath, the heat exchange means raises the temperature of the bath water in the bathtub so that the temperature reaches the condition value of the water temperature used in the calculation in the second mode at the recommended bathing start time in the second mode. The hot water storage type hot water supply device according to claim 2.

5. a bath filling means for filling the bathtub with a set amount of water and a set temperature; Further provided with If the bathtub filling means has not filled the bathtub by the recommended bathtub start time calculated in the first mode or the recommended bathtub start time calculated in the second mode, information recommending filling the bathtub is displayed on the display means. The hot water storage type hot water supply device according to claim 1.

6. In the second mode, if the updated hot water temperature condition value exceeds a specified upper limit temperature, the display means displays a message indicating that there is no recommended bathing start time available. The hot water storage type hot water supply device according to any one of claims 1 to 5.

7. In the second mode, if the updated hot water temperature condition value exceeds a specified upper limit temperature, the display means displays a message that there is no recommended bathing start time that can be presented, and the recommended bathing start time and bathing duration calculated in the first mode. The hot water storage type hot water supply device according to any one of claims 1 to 5.

8. When it is detected that the person who will take a bath has not started bathing even though the recommended bathing start time in the first mode has passed after the first mode is displayed, the calculation means regards the current time as the reception time and calculates the recommended bathing start time and bathing duration in the second mode, In the second mode, if the updated hot water temperature condition value exceeds a specified upper limit temperature, the display means displays a message indicating that there is no recommended bathing start time available. The hot water storage type hot water supply device according to any one of claims 1 to 5.

9. If the updated hot water temperature condition value exceeds a specified upper limit temperature in the second mode, the display means further displays the recommended bathing start time and bathing duration calculated in the first mode. The hot water storage type hot water supply device according to claim 8.

10. a bubble generating means for generating bubbles in the hot water of the bathtub; Further provided with When the condition value of the updated hot water temperature is equal to or higher than the bubble temperature in the second mode, the calculation means calculates, as the second mode, a recommended bathing start time and bathing duration for the person to take a bath based on the hot bath effect of the bubbles generated by the bubble generating means, the condition value of the updated hot water temperature, and the planned bedtime. The hot water storage type hot water supply device according to any one of claims 1 to 5.

11. In the second mode, if the updated hot water temperature condition value exceeds a predetermined upper limit temperature, the display means displays a message that there is no recommended bathing start time that can be presented, The bubble temperature is set to a value equal to the upper limit temperature. The hot water storage type hot water supply device according to claim 10.

12. The display means includes: When the calculation result of the first mode is displayed, the calculation result of the first mode is displayed again at a time that is a specified notification time before the recommended bathing start time in the first mode, When the calculation result of the second mode is displayed, the calculation result of the second mode is displayed again at a time that is a specified notification time before the recommended bathing start time in the second mode. The hot water storage type hot water supply device according to any one of claims 1 to 5.

13. an input means for receiving input of a planned bedtime from a person who plans to take a bath; a display means for displaying information to the person planning to take a bath; a calculation means for calculating, in a first mode, a recommended bathing start time and bathing duration for the person planning to take a bath, based on the condition value of the planned bedtime and the water temperature, when the input means receives the input of the planned bedtime at the reception time; Equipped with When the recommended bathing start time calculated in the first mode or the second mode is a time before the reception time, the calculation means updates the current hot water temperature condition value to a condition value that is larger by a specified increase amount in the second mode, and calculates a recommended bathing start time and bathing duration for the person planning to take a bath based on the updated hot water temperature condition value and the planned bedtime. The display means includes: If the recommended bathing start time calculated in the first mode is later than the reception time, the recommended bathing start time and bathing duration calculated in the first mode are displayed. If the recommended bathing start time calculated in the first mode is a time before the reception time, the recommended bathing start time and bathing duration calculated in the second mode are displayed. Hot water system.

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