JP6238833B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater capable of supplying hot water for washing vegetables at high temperature.

  In recent years, vegetable cleaning and storage methods have been known in which vegetables are soaked in hot water of about 50 ° C. (within a range of 45 ° C. to 55 ° C.) for about several tens of seconds or for several minutes. It has become. According to this high temperature washing method of washing vegetables, it is possible to obtain a higher washing effect than the method of washing vegetables with cold water washing, and it can be expected to maintain freshness, reduce bacteria, and improve taste and texture. It is said.

Currently, for example, hot water heaters such as hot water storage type electric water heaters disclosed in Patent Document 1 are widely used for general households. Thereby, at the time of cooking, use of hot water can be performed easily. The water heater of Patent Document 1 uses a heat pump as a heat source to boil high-temperature hot water, store the high-temperature hot water in a hot water storage tank, and supply hot water to the kitchen, washroom, bathroom, etc. based on the hot water in the hot water storage tank. ing. During hot water supply, adjust the mixing ratio of hot water in the hot water tank and hot water in the hot water tank, or adjust the mixing ratio of hot water in the hot water tank and tap water according to the hot water temperature set with the remote controller of the hot water heater For example, hot water of a set hot water temperature is supplied. There is also a water heater that supplies hot water by heating tap water with hot water in a hot water storage tank.
In addition, in the kitchen or bathroom, there is a mixing faucet that has a thermostat built in the faucet and changes the mixing ratio of hot water and tap water according to the set temperature to obtain hot water at the set temperature.

JP 2009-127876 A

  According to said prior art, the hot water for high temperature washing of vegetables can be obtained easily. However, the set temperature of general water heaters including the above-described prior art water heaters is a set value of about 40 ° C. For this reason, in order to set the hot water temperature for the high temperature washing of vegetables, the hot water temperature setting is performed by pressing a button on the remote controller, and after the washing of vegetables is finished, the remote controller is operated to restore the setting. In addition, when setting the hot water temperature for high temperature washing of vegetables, high temperature hot water comes out from other hot water outlets such as shower hot water, which has a problem in safety.

  The object of the present invention is to provide a water heater that eliminates the hassle of operation when using hot water for hot washing of vegetables, improves usability, and increases safety when using hot water. There is.

In order to solve the above-described problem, a water heater of the present invention includes a remote controller for instructing to change a hot water supply set temperature to a predetermined high temperature, and a hot water sensor for detecting a flow rate and a temperature of hot water. After the temperature change instruction, the hot water is heated to the hot water set temperature instructed to change based on the temperature of the hot water detected by the hot water sensor, and the hot water at the specified hot water temperature is supplied for a predetermined hot water supply time. Or when the integrated value of the flow rate of hot water at the hot water temperature indicated by the hot water sensor detected by the hot water sensor becomes a predetermined amount, the hot water supply temperature set immediately before the hot water supply temperature is changed by the remote controller with return temperature, when it is an instruction to change the hot water set temperature by the first remote control, when the hot water supply has been performed, disables an instruction to change the first remote control It was way.

  ADVANTAGE OF THE INVENTION According to this invention, it is easy to use and can provide the hot water supply machine which supplies hot water for hot washing of vegetables safely.

It is a figure which shows the structure of the water heater of an Example. It is a figure which shows the external appearance of the kitchen remote control of an Example. It is a figure which shows the external appearance of the bathroom remote control of an Example. It is a figure which shows the operation | movement flow of the high temperature hot water supply of an Example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The hot water heater of the present embodiment makes it possible to easily perform hot water temperature setting for high temperature washing of vegetables, which is different from general hot water temperature setting (about 40 ° C.) in which the user can change the set value. Even when hot water is supplied to another place other than the kitchen, the user can be protected.
Specifically, in the water heater of the present embodiment, the user sets the hot water temperature for hot washing of vegetables by operating the kitchen remote controller of the hot water heater, the hot water temperature is changed based on this setting change, and the hot water supply starts. Then, hot water for hot washing of vegetables for a predetermined time or a predetermined amount of hot water is supplied. Then, the hot water temperature setting is automatically restored to the state before the high temperature washing setting for the vegetables without the user resetting the kitchen remote control (setting for return).

(Example)
FIG. 1 is a diagram illustrating an outline of the configuration of the water heater of the present embodiment.
The water heater of this embodiment is composed of a hot water storage unit 1 and a heat source unit 2 and supplies hot water to a kitchen faucet 3, a bathroom faucet / shower 4, and a bath tub 5. Hot water supplied to the kitchen and bathroom is generated from high-temperature hot water stored in the hot water storage tank 6 of the hot water storage unit 1.

  The hot water storage tank 6 stores hot water having a temperature distribution in which the upper part is high temperature and the lower part is low temperature, and high temperature hot water of 65 ° C. to 90 ° C. boiled by the heat source unit 2 is stored in the upper part. By supplying hot water to the kitchen or bathroom, the amount of hot water decreases, but tap water depressurized by the pressure reducing valve 7 is supplied from the lower part of the hot water storage tank 6, and the hot water storage tank 6 is always filled with hot water. Yes.

  The heat source unit 2 boils low temperature water supplied from the lower part of the hot water storage tank 6 into hot water of 65 ° C. to 90 ° C. and returns it to the upper part of the hot water storage tank 6. The heat source unit 2 is suitably a heat pump type heating unit with high energy efficiency when boiling water, but may be composed of an electric heater heating unit or a gas water heating unit.

First, the bath water supply of the hot water supply apparatus of an Example is demonstrated.
Hot water in the upper part of the hot water storage tank 6 and tap water depressurized by the pressure reducing valve 7 are mixed into the bath tank 5 by the mixing valve 8 and hot water is supplied. The mixing ratio of the mixing valve 8 is determined by the hot water temperature setting described later, the temperature of tap water downstream of the pressure reducing valve 7 detected by a water supply thermistor (not shown), and the hot water storage tank detected by an upper thermistor of the hot water storage tank 6 (not shown). The mixing valve 8 is controlled by a control unit of a water heater (not shown).

Next, hot water supply to the kitchen faucet 3 and the bathroom faucet / shower 4 will be described.
The water heater according to the embodiment includes a heat exchanger 9 and a circulation pump 10 that circulates hot water in the hot water storage tank 6 through the heat exchanger 9. And the tap water is directly connected to the heat exchanger 9 without passing through the decompressor 7. Also, the hot water in the upper part of the hot water storage tank 6 flows into the heat exchanger 9 and is transferred to the tap water by the circulation pump 10 so that the hot water that has been cooled down and returned to the lower part of the hot water storage tank 6. It is driven. With this configuration, the heat from the hot water storage tank 6 is transferred to the tap water by the heat exchanger 9, and the hot tap water is supplied to the kitchen faucet 3 and the bathroom faucet / shower 4. The water heater of the present embodiment adopts a direct water pressure type configuration, and there is no problem of water pressure drop at the faucet / shower 4.
The kitchen faucet 3 and the bathroom faucet / shower 4 each have a mixing valve, and hot water and tap water heated by the heat exchanger 9 are appropriately mixed by the user to adjust the hot water temperature and amount. Is done.

The hot water temperature and flow rate of hot water supplied to the kitchen faucet 3 and the bathroom faucet / shower 4 are detected by a hot water supply sensor 11 provided on the outlet side of the heat exchanger 9. When the flow rate is detected by the hot water supply sensor 11 and the flow of hot water is recognized, the circulation pump 10 is controlled so that the detected temperature of the hot water supply sensor 11 becomes the set temperature of the hot water temperature, and the circulation flow rate is adjusted. At this time, in the heat exchanger 9, the amount of heat transferred to the tap water changes, and the hot water supply temperature changes. For example, the circulating flow rate is adjusted so that the hot water supply temperature is within ± 0.3 ° C. of the set temperature.
In the hot water supply apparatus of the embodiment, the tap water heated in the kitchen faucet 3 is directly connected to the hot water supply, so that there is no problem in sanitary aspect of vegetable washing as compared with the case where hot water in the hot water storage tank 6 is mixed.

  As mentioned above, the kitchen faucet 3 and the bathroom faucet / shower 4 are heated by the heat exchanger 9 to supply hot water. When the kitchen faucet 3 is supplied with hot water for washing vegetables, The shower 4 also has a problem that hot water is supplied. Furthermore, in the case where the hot water from the heat exchanger 9 is also supplied to the bathroom, there is a problem that hot water is supplied to the faucet of the bathroom.

  In the hot water supply apparatus of the embodiment, the hot water supply temperature is set by a remote controller to be described in detail later, and a control unit of the hot water supply apparatus (not shown) controls the hot water supply to various places according to the set hot water supply temperature. When the hot water temperature setting for high temperature washing of vegetables is performed with the kitchen remote controller, the circulation pump 10 is controlled so that the hot water supply temperature of the kitchen faucet 3 is 50 ° C. Then, the hot water temperature setting is restored to the state before the setting for the high temperature washing of vegetables without the user resetting the kitchen remote control (setting for returning). It also alerts and warns users of bathrooms and toilets other than the kitchen, and notifies hot water temperature conditions to kitchen users.

In the present embodiment, a hot water supply type hot water heater that supplies hot water by heating tap water with a heat exchanger will be described, but the mixing ratio of the mixing valve is set according to the hot water temperature setting in the same manner as in the bath water supply. change,
The present invention can also be applied to a high-pressure (pressure reducing valve type) water heater that mixes tap water and hot water of the hot water storage unit 1 and supplies hot water at a set temperature. Further, as long as the hot water temperature can be set, the present invention can be applied to a gas water heater that does not store hot water.

  Next, a remote controller that performs hot water temperature setting and operation instructions of the water heater of the embodiment will be described. FIG. 2 shows the appearance of the kitchen remote controller 12 installed in the kitchen, and FIG. 3 shows the appearance of the bathroom remote controller 13.

  The kitchen remote control 12 of FIG. 2 includes a display unit 20, a hot water supply temperature setting button 21, a bath automatic hot water supply button 23, a vegetable washing button 24, an informative (status display) button 25, a call button 27, a microphone 28, and a speaker. 29. These buttons may be composed of switches or pressure-sensitive touch panels. In addition, an LED display unit that lights up when the button is pressed may be provided above the button (square frame in the figure).

  The display unit 20 displays an operation state and a setting state of the water heater. For example, as shown in FIG. 2, the hot water supply temperature set value <40 ° C.>, the hot water supply temperature set value <40 ° C.> of the kitchen faucet 3 (see FIG. 1) and the hot water storage in the hot water storage tank 6 (see FIG. 1). Display quantity. In addition, as an operating state, the hot water in the bath tub 5 (see FIG. 1), the priority state of either the kitchen hot water temperature or the bathroom hot water temperature, or the hot water storage tank 6 (see FIG. 1) is being heated. To display things.

  By pressing the hot water supply temperature setting button 21 composed of an up arrow button for increasing the hot water supply temperature and a down arrow button for decreasing the temperature, the hot water supply temperature setting of the kitchen faucet 3 (for example, 35 to 48 ° C. in increments of 1 ° C. of water temperature)・ 50 ℃ ・ 55 ℃ ・ 60 ℃） The value of the set value is displayed on the display unit 20. The hot water supply temperature may be set by a method using voice input from the microphone 28.

  The bath automatic hot water supply button 23 is a button for instructing a hot water beam operation of the bath 5 (see FIG. 1). It is assumed that the hot water supply temperature, the amount of hot water, etc. at this time are set in advance. When the hot water is completed, a chime sound is output to the speaker 29 to notify the completion of the hot water.

  The vegetable washing button 24 is a button for instructing the kitchen faucet 3 to supply hot water for washing vegetables at a high temperature. By depressing the vegetable washing button 24, hot water for high temperature washing is supplied to the kitchen faucet 3 in the procedure described later.

The button 25 is a button for instructing to display the setting state of the current hot water supply temperature of the water heater, the setting state of the hot water amount and the operation state on the display unit 20, or to output sound to the speaker 29. is there.
The call button 27 is a button for instructing a telephone call between the kitchen remote controller 12 and the microphone 28 and the speaker 29 of the bathroom remote controller 13 between the user of the kitchen and the bathroom.

The bathroom remote control 13 in FIG. 3 includes a display unit 20, a hot water supply temperature setting button 21, a bath automatic hot water supply button 23, a follow-up button 26, a guide (status display) button 25, a bathroom priority button 22, and a call button. 27, a microphone 28, and a speaker 29.
The functions of the buttons will be described below, but the buttons having the same reference numerals as those of the kitchen remote control 12 in FIG.

  The hot water supply temperature setting button 21 is a button for setting the hot water supply temperature of the bath tub 5 (see FIG. 1) and the hot water supply temperature of the faucet / shower 4 in the bathroom. When the bathroom priority button 22 is pressed, the hot water temperature setting set by the hot water temperature setting button 21 is valid, and hot water at the set temperature is supplied to the faucet / shower 4 in the bathroom.

  The chasing button 26 is a button for instructing chasing the hot water of the bath 5. Although not described in FIG. 1, the hot water supply apparatus of the embodiment has a hot water supply pipe for performing hot water and hot water on the bath tub 5, and hot water provided in the hot water storage tank 6 for the hot water of the bath tub 5. It has a follower pipe that circulates back to the exchanger and a bath circulation pump, so that the hot water in the bath 5 circulates between the bath 5 and the follower heat exchanger via the follower pipe and the hot water supply pipe. . The follow-up heat exchanger transfers heat from the hot water in the upper part of the hot water storage tank 6 to the boiling water and heats the boiling water.

Next, an operation when the vegetable washing button 24 of the kitchen remote controller 12 is pressed will be described with reference to FIG.
The control unit (not shown) of the water heater of the embodiment determines whether or not the vegetable washing button 24 of the kitchen remote controller 12 described in FIG. 2 has been pressed (S30), and if not, waits for the vegetable washing button 24 to be pressed (S30). No).
The detection of pressing of the vegetable washing button 24 may be detected by pressing twice. According to this, high temperature hot water supply due to an operation mistake of the kitchen remote controller 12 can be prevented, and thus safety is further improved.

  If pressed (Yes in S30), the flow rate sensor of the hot water supply sensor 11 acquires the flow rate of hot water, and determines whether hot water is supplied to the kitchen or bathroom (S31). If hot water is being supplied (Yes in S31), it waits for the vegetable washing button 24 to be pressed again. This process can cause problems such as burns to the user if the hot water temperature during hot water supply (especially bathroom hot water) suddenly becomes hot due to vegetable washing. It is a process for prevention. At this time, since hot water is being supplied to the display unit 20 of the kitchen remote controller 12, it is even better to display that the hot water for washing vegetables cannot be supplied or to output an alarm through the speaker 29.

If hot water is not being supplied (No in S31), the current hot water temperature setting value is saved (S32), and the hot water temperature setting value is changed to 50 ° C. for washing vegetables (S33). And in order to show that the hot water supply operation | movement for vegetable washing was started, while displaying the operation during vegetable washing etc. on the display part 20 of the kitchen remote control 12, attention to high temperature hot water supply etc. also to the display part 20 of the bathroom remote control 13 etc. Is displayed (S34). At this time, sound output for alerting may be performed by the speaker 29 of the kitchen remote controller 12 and the bathroom remote controller 13.
It is preferable that the alert display such as high-temperature hot water caution by the bathroom remote controller 13 and the audio output of the caution are continuously performed until the high-temperature hot water supply for vegetable washing is completed.

In order to detect hot water supply by opening the faucet 3 of the kitchen, the flow rate sensor of the hot water supply sensor 11 determines the presence or absence of running hot water (S35), and if there is no running hot water (No in S35), Wait for user to open. If there is hot water running water, the circulation pump 10 of the heat exchanger 9 is controlled to start heating the 50 ° C. hot water. It is determined by the temperature sensor of the hot water supply sensor 11 whether or not the hot water temperature has reached 50 ° C. (S 36), and if the hot water temperature is less than 50 ° C., the hot water temperature rises (No in S 36). .
If the hot water temperature is 50 ° C. (Yes in S36), the hot water amount integrated value and hot water supply time of the high temperature hot water supply are reset (S37). That is, the time when 50 ° C. is detected by the temperature sensor of the hot water supply sensor 11 is set as the starting point of the high temperature hot water supply for vegetable washing.

  At this time, it is preferable to display a status display such as the start of hot water supply on the display unit 20 of the kitchen remote controller 12. Specifically, a pipe delay time until 50 ° C. hot water flows into the kitchen faucet 3 is obtained for each flow rate, and the pipe delay time is acquired based on the flow rate detected by the flow rate sensor of the hot water supply sensor 11. . Then, after the pipe delay time has elapsed from the start point of the hot water supply, if the state display such as the start of high temperature hot water supply or a sound output is made to the speaker 29, the user can be notified that the vegetable washing is ready.

  Next, the hot water supply is performed while counting the amount of hot water supply and counting the hot water supply time until the end condition of the high temperature hot water supply is satisfied, and the following processing is repeated.

First, it is determined whether an operation for changing the hot water supply temperature has been performed by the bathroom remote controller 13 such as pressing the bathroom priority button 22 (S38). If the hot water supply temperature changing operation has not been performed (No in S38), the process proceeds to the next process.
When the operation of changing the hot water supply temperature is performed (Yes in S38), the setting change of the hot water supply temperature is invalidated, and a warning message such as high temperature hot water supply is displayed on the display unit 20 of the bathroom remote controller 13 or a warning message is output by the speaker 29. (S39). This is to prevent hot water of 50 ° C. from being supplied to the bathroom and causing problems such as burns.

Next, it is determined whether the hot water supply for vegetable washing has been performed for a predetermined flow rate (S40). If the predetermined flow rate has not been reached (No in S40), the process proceeds to S41.
The determination is made based on whether or not the hot water integrated value of the high temperature hot water supply is equal to or higher than a predetermined flow rate value. Specifically, it may be about 10 liters, but since it varies depending on the method of use, the flow rate value may be set by the kitchen remote controller 12.

When the predetermined flow rate value is reached (Yes in S40), high temperature hot water supply termination processing for washing vegetables is performed (S43).
Specifically, the hot water supply temperature setting value before the depression of the vegetable washing button 24 saved in S32 is read, and the hot water supply temperature setting is restored. Then, the display unit 20 of the kitchen remote controller 12 and the display unit 20 of the bathroom remote controller 13 display that the high temperature hot water supply has ended, and also output a sound to the speaker 29 that the high temperature hot water supply has ended. Thereby, the process of the hot water supply started by pressing the vegetable washing button 24 is normally completed.
Here, the reason for notifying the end of the hot water supply from the bathroom remote controller 13 is to notify the user of the hot water supply in the bathroom that the operation of changing the hot water supply temperature or the like can be performed.

In S41, it is determined whether the hot water supply for washing vegetables has been performed for a predetermined hot water supply time. If the predetermined hot water supply time has not been reached (No in S41), the process proceeds to S42.
The determination is made based on whether or not the hot water supply time of the high temperature hot water supply is a predetermined time value or more. Specifically, it may be a value of a few minutes (for example, 3 minutes), but it may be set by the kitchen remote controller 12 because it changes depending on the method of use.
When the predetermined time value is reached (Yes in S41), the high temperature hot water supply termination processing for vegetable cleaning in S43 described above is performed.

  Although the process of determining the end of high-temperature hot water supply for vegetable washing has been described with S40 and S41 above, the end of high-temperature hot water supply may be determined by either process of S40 or S41.

In S42, a change in the hot water supply flow rate is monitored, and when a flow rate change larger than a predetermined value is detected (Yes in S42), a high temperature hot water supply interruption process (S44) is performed. When the flow rate change is small (No in S44), the process returns to S38 and the hot water supply is continued.
Specifically, when a flow rate change of 1 liter / min or more is detected, the process proceeds to high temperature hot water supply interruption processing (S44).
The determination of S42 is a process for detecting that the faucet / shower 4 in the bathroom is open during hot water supply and that hot water is being supplied.

  In S44, in order to reduce or suppress problems such as burns caused by hot hot water being supplied to the bathroom, the set value of the hot water supply temperature is restored to the value saved in S32, and the display unit 20 of the kitchen remote control 12 and the bathroom remote control are restored. The display unit 20 displays that the high-temperature hot water supply is interrupted, and outputs a sound to the speaker 29 that the high-temperature hot water supply is interrupted. Then, the hot water supply process started by pressing the vegetable washing button 24 is interrupted. At this time, once the operation of the circulation pump 10 is stopped, the temperature drop of the hot water supply can be accelerated.

  By the above procedure, hot water of 50 ° C. is supplied to the kitchen faucet 3 by pressing the vegetable washing button 24. When the pipe length from the water heater to the kitchen faucet 3 is long, even if water flows from the faucet 3, there is a delay until hot water of 50 ° C. flows. As described above, there is a method of performing status display and sound on the display unit 20 of the kitchen remote controller 12 in consideration of the piping delay time, but there is another method of checking hot water with a fingertip or the like. This confirmation method is not without the possibility of burns. For this reason, it is desirable that the temperature of the hot water is visible.

  In brief, the temperature of the hot water can be visually recognized by sticking a temperature sensitive sheet on which reversible temperature indicating ink or the like is printed at a location where heat conduction from the hot water of the kitchen faucet 3 is high. A temperature-sensitive sheet that changes color between 45 ° C. and 55 ° C. suitable for high-temperature washing of vegetables is used.

  The present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments have been described in detail for easy understanding in the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

DESCRIPTION OF SYMBOLS 1 Hot water storage unit 2 Heat source unit 3 Faucet 4 Faucet / shower 5 Bathing bath 6 Hot water storage tank 7 Pressure reducing valve 8 Mixing valve 9 Heat exchanger 10 Circulation pump 11 Hot water sensor

Claims (9)

A first remote control for instructing to change the hot water supply set temperature to a predetermined high temperature;
A hot water sensor for detecting the flow rate and temperature of hot water,
After an instruction to change the hot water supply set temperature by the first remote controller,
Hot water is heated to a hot water set temperature instructed to change based on the temperature of hot water detected by the hot water sensor,
When the hot water supply at the hot water temperature instructed to change is performed for a predetermined hot water supply time, or when the integrated value of the flow rate of hot water at the hot water temperature instructed to change detected by the hot water sensor becomes a predetermined amount, The hot water supply set temperature is returned to the hot water set temperature immediately before the change is instructed by the first remote controller,
The hot water heater is characterized by invalidating the change instruction of the first remote controller when hot water supply is performed when the first remote controller is instructed to change the hot water supply set temperature. A first remote control for instructing to change the hot water supply set temperature to a predetermined high temperature;
A hot water sensor for detecting the flow rate and temperature of hot water,
After an instruction to change the hot water supply set temperature by the first remote controller,
Hot water is heated to a hot water set temperature instructed to change based on the temperature of hot water detected by the hot water sensor,
When the hot water supply at the hot water temperature instructed to change is performed for a predetermined hot water supply time, or when the integrated value of the flow rate of hot water at the hot water temperature instructed to change detected by the hot water sensor becomes a predetermined amount, The hot water supply set temperature is returned to the hot water set temperature immediately before the change is instructed by the first remote controller,
When the hot water supply sensor detects a change in the flow rate of hot water of a predetermined value or more during the hot water supply instructed to change, the hot water supply set temperature is returned to the hot water set temperature immediately before the change is instructed by the first remote controller. Then, the hot water heater is characterized by interrupting the hot water supply. A first remote control for instructing to change the hot water supply set temperature to a predetermined high temperature;
A hot water sensor for detecting the flow rate and temperature of hot water,
After an instruction to change the hot water supply set temperature by the first remote controller,
Hot water is heated to a hot water set temperature instructed to change based on the temperature of hot water detected by the hot water sensor,
When the hot water supply at the hot water temperature instructed to change is performed for a predetermined hot water supply time, or when the integrated value of the flow rate of hot water at the hot water temperature instructed to change detected by the hot water sensor becomes a predetermined amount, The hot water supply set temperature is returned to the hot water set temperature immediately before the change is instructed by the first remote controller,
A second remote control for controlling a hot water supply state at a location different from the first remote control,
The hot water heater is characterized by invalidating the hot water temperature setting change by the second remote controller during the high temperature hot water supply instructed to change by the first remote controller. A first remote control for instructing to change the hot water supply set temperature to a predetermined high temperature;
A hot water sensor for detecting the flow rate and temperature of hot water,
After an instruction to change the hot water supply set temperature by the first remote controller,
Hot water is heated to a hot water set temperature instructed to change based on the temperature of hot water detected by the hot water sensor,
When the hot water supply at the hot water temperature instructed to change is performed for a predetermined hot water supply time, or when the integrated value of the flow rate of hot water at the hot water temperature instructed to change detected by the hot water sensor becomes a predetermined amount, The hot water supply set temperature is returned to the hot water set temperature immediately before the change is instructed by the first remote controller,
When the hot water temperature detected by the hot water sensor reaches the hot water set temperature instructed to change after an instruction to change the hot water set temperature by the first remote controller, an integrated value of the hot water supply time and the flow rate is obtained. A water heater that is reset. In the water heater according to any one of claims 1 to 4,
The hot water supply set temperature instructed to be changed by the first remote controller is a temperature for washing vegetables in a range of 45 ° C to 55 ° C. In the water heater according to any one of claims 1 to 4,
A hot water supply apparatus that performs notification of the start of high-temperature hot water supply when the temperature of hot water supplied from a faucet reaches the hot water set temperature instructed to change. The water heater according to claim 6 ,
After a predetermined time corresponding to a pipe delay from the water heater to the faucet after the hot water temperature detected by the hot water sensor reaches the hot water set temperature instructed to change, the first remote controller A hot water supply apparatus that performs start display or outputs a voice to the start of high temperature hot water supply to notify the start of high temperature hot water supply. In the water heater according to any one of claims 1 to 4,
A second remote control for controlling a hot water supply state at a location different from the first remote control,
When the hot water supply set temperature is instructed to be changed to a high temperature by the first remote controller, a high temperature hot water alert is displayed on the second remote controller or a high temperature hot water alert is output by voice. A water heater. The water heater according to claim 8 ,
The hot water heater is characterized in that the alert display and the alert sound output performed by the second remote controller are continuously performed until the high temperature hot water supply is completed.

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