JP5928511B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus.

  Conventionally, as a hot water supply device, a mixing valve for mixing hot water from the upper part of the hot water storage tank and water from the outside, a hot water supply circuit for supplying hot water to the hot water supply terminal from the upper part of the hot water storage tank via the mixing valve, and a hot water supply circuit Some have a bath hot water supply circuit that branches downstream from the mixing valve and is connected to the bathtub (see, for example, Japanese Patent Laid-Open No. 11-132561 (Patent Document 1)).

Japanese Patent Laid-Open No. 11-132561

  By the way, in the above hot water supply apparatus, when the hot water supply to the bathtub is completed with 38 ° C. mixed water from the mixing valve, or when a shower as a hot water supply terminal is used during hot water supply to the bathtub, Close the valve and stop hot water supply to the bathtub. At this time, in the hot water supply apparatus, even if the hot water supply set temperature for the shower is set to 40 ° C, the temperature of the mixed water from the mixing valve is not immediately changed from 38 ° C to 40 ° C. Has a problem that the user gets uncomfortable because the hot water is discharged from the shower.

  Then, the subject of this invention is providing the hot-water supply apparatus which can suppress the fluctuation | variation of the hot-water supply temperature with respect to hot-water supply preset temperature, when hot-water supply to a bathtub is stopped and hot-water supply terminal is supplied hot water immediately.

In order to solve the above problems, the hot water supply apparatus of the present invention is:
A hot water storage tank,
A mixing valve for mixing hot water from the upper part of the hot water storage tank and water from the outside;
A hot water supply circuit for supplying hot water from the upper part of the hot water storage tank to the hot water supply terminal via the mixing valve;
A bath hot water circuit for branching downstream of the mixing valve of the hot water circuit and supplying hot water to the bathtub;
Opening and closing means for opening and closing the bath hot water supply circuit;
A control device for controlling the mixing valve and the opening / closing means;
The control device
When supplying hot water to the hot water supply terminal, control the mixing valve so that the mixed water from the mixing valve reaches a hot water supply set temperature, and when supplying hot water to the bathtub, the mixed water from the mixing valve is set in a bath. Control the mixing valve to reach the temperature,
When the hot water supply to the bathtub is stopped, the opening of the mixing valve is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature ,
When the hot water supply to the bathtub is stopped, the control device sets the opening of the mixing valve to an opening corresponding to a temperature between the bath set temperature and the hot water set temperature .

According to the above configuration, when supplying hot water to the hot water supply terminal, the control device controls the mixing valve so that the mixed water from the mixing valve reaches the hot water supply set temperature, and when supplying hot water to the bathtub, the control device To control the mixing valve so that the mixed water from the mixing valve reaches the bath set temperature. When the hot water supply to the bathtub is stopped, the hot water supply to the hot water terminal is stopped immediately after the hot water supply to the bathtub is stopped by setting the opening of the mixing valve to the hot water supply set temperature side of the opening corresponding to the bath set temperature. When doing so, the mixing valve can be quickly opened to correspond to the hot water supply set temperature, and fluctuations in the hot water supply temperature with respect to the hot water supply set temperature can be suppressed.
When the hot water supply to the bathtub is stopped, the opening of the mixing valve is set to an opening corresponding to the temperature between the bath set temperature and the hot water set temperature, thereby stopping the hot water supply to the bathtub immediately. When hot water is supplied to the terminal, it becomes possible to quickly drive the mixing valve to an opening corresponding to the hot water set temperature, and to suppress fluctuations in the hot water temperature relative to the hot water set temperature.
The hot water supply apparatus of this invention is
A hot water storage tank,
A mixing valve for mixing hot water from the upper part of the hot water storage tank and water from the outside;
A hot water supply circuit for supplying hot water from the upper part of the hot water storage tank to the hot water supply terminal via the mixing valve;
A bath hot water circuit for branching downstream of the mixing valve of the hot water circuit and supplying hot water to the bathtub;
Opening and closing means for opening and closing the bath hot water supply circuit;
A control device for controlling the mixing valve and the opening / closing means;
With
The control device
When supplying hot water to the hot water supply terminal, control the mixing valve so that the mixed water from the mixing valve reaches a hot water supply set temperature, and when supplying hot water to the bathtub, the mixed water from the mixing valve is set in a bath. Control the mixing valve to reach the temperature,
When the hot water supply to the bathtub is stopped, the opening of the mixing valve is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature,
The control device is a mixing valve that estimates an opening degree of the mixing valve corresponding to the hot water supply set temperature based on the temperature of the hot water in the upper part of the hot water storage tank, the temperature of the external water, and the hot water supply set temperature. It has the opening degree estimation part.
According to the above configuration, when supplying hot water to the hot water supply terminal, the control device controls the mixing valve so that the mixed water from the mixing valve reaches the hot water supply set temperature, and when supplying hot water to the bathtub, the control device To control the mixing valve so that the mixed water from the mixing valve reaches the bath set temperature. When the hot water supply to the bathtub is stopped, the hot water supply to the hot water terminal is stopped immediately after the hot water supply to the bathtub is stopped by setting the opening of the mixing valve to the hot water supply set temperature side of the opening corresponding to the bath set temperature. When doing so, the mixing valve can be quickly opened to correspond to the hot water supply set temperature, and fluctuations in the hot water supply temperature with respect to the hot water supply set temperature can be suppressed.
In addition, based on the temperature of the hot water in the upper part of the hot water storage tank, the temperature of the water from the outside, and the hot water supply set temperature, the opening corresponding to the hot water set temperature of the mixing valve is estimated by the mixing valve opening estimation unit Thus, the opening degree of the mixing valve can be adjusted with respect to the hot water supply set temperature without detecting the temperature of the mixed water from the actual mixing valve.
The hot water supply apparatus of this invention is
A hot water storage tank,
A mixing valve for mixing hot water from the upper part of the hot water storage tank and water from the outside;
A hot water supply circuit for supplying hot water from the upper part of the hot water storage tank to the hot water supply terminal via the mixing valve;
A bath hot water circuit for branching downstream of the mixing valve of the hot water circuit and supplying hot water to the bathtub;
Opening and closing means for opening and closing the bath hot water supply circuit;
A control device for controlling the mixing valve and the opening / closing means;
With
The control device
When supplying hot water to the hot water supply terminal, control the mixing valve so that the mixed water from the mixing valve reaches a hot water supply set temperature, and when supplying hot water to the bathtub, the mixed water from the mixing valve is set in a bath. Control the mixing valve to reach the temperature,
When the hot water supply to the bathtub is stopped, the opening of the mixing valve is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature,
When the hot water supply to the bathtub is started, the control device sets the opening of the mixing valve to an opening corresponding to the bath set temperature, and then opens the opening / closing means.
According to the above configuration, when supplying hot water to the hot water supply terminal, the control device controls the mixing valve so that the mixed water from the mixing valve reaches the hot water supply set temperature, and when supplying hot water to the bathtub, the control device To control the mixing valve so that the mixed water from the mixing valve reaches the bath set temperature. When the hot water supply to the bathtub is stopped, the hot water supply to the hot water terminal is stopped immediately after the hot water supply to the bathtub is stopped by setting the opening of the mixing valve to the hot water supply set temperature side of the opening corresponding to the bath set temperature. When doing so, the mixing valve can be quickly opened to correspond to the hot water supply set temperature, and fluctuations in the hot water supply temperature with respect to the hot water supply set temperature can be suppressed.
In addition, when hot water supply to the bathtub is started, the control device sets the opening of the mixing valve to the opening corresponding to the bath set temperature, and then opens the open / close means of the bath hot water circuit to open the bath hot water circuit. The temperature of the mixed water from the mixing valve can be quickly brought to the bath set temperature immediately after opening.
The hot water supply apparatus of this invention is
A hot water storage tank,
A mixing valve for mixing hot water from the upper part of the hot water storage tank and water from the outside;
A hot water supply circuit for supplying hot water from the upper part of the hot water storage tank to the hot water supply terminal via the mixing valve;
A bath hot water circuit for branching downstream of the mixing valve of the hot water circuit and supplying hot water to the bathtub;
Opening and closing means for opening and closing the bath hot water supply circuit;
A control device for controlling the mixing valve and the opening / closing means;
With
The control device
When supplying hot water to the hot water supply terminal, control the mixing valve so that the mixed water from the mixing valve reaches a hot water supply set temperature, and when supplying hot water to the bathtub, the mixed water from the mixing valve is set in a bath. Control the mixing valve to reach the temperature,
When the hot water supply to the bathtub is stopped, the opening of the mixing valve is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature,
When stopping the hot water supply to the bathtub for hot water supply to the hot water supply terminal, the control device sets the opening of the mixing valve to an opening corresponding to the hot water supply set temperature, and then closes the opening / closing means. It is characterized by.
According to the above configuration, when supplying hot water to the hot water supply terminal, the control device controls the mixing valve so that the mixed water from the mixing valve reaches the hot water supply set temperature, and when supplying hot water to the bathtub, the control device To control the mixing valve so that the mixed water from the mixing valve reaches the bath set temperature. When the hot water supply to the bathtub is stopped, the hot water supply to the hot water terminal is stopped immediately after the hot water supply to the bathtub is stopped by setting the opening of the mixing valve to the hot water supply set temperature side of the opening corresponding to the bath set temperature. When doing so, the mixing valve can be quickly opened to correspond to the hot water supply set temperature, and fluctuations in the hot water supply temperature with respect to the hot water supply set temperature can be suppressed.
Further, when stopping hot water supply to the bathtub for hot water supply to the hot water supply terminal, the control device sets the opening of the mixing valve to an opening corresponding to the hot water supply set temperature, and then closes the opening / closing means. Since the mixed water at the hot water supply set temperature flows from the mixing valve to the hot water supply circuit until the opening / closing means is closed, the rising of the mixed water supplied from the mixing valve to the hot water supply terminal to the hot water supply set temperature is accelerated.

Moreover, in the hot water supply apparatus of one embodiment,
The said control apparatus makes the opening degree of the said mixing valve the opening degree corresponding to the said hot water supply preset temperature, when the hot water supply to the said bathtub is stopped.

  According to the above embodiment, when the hot water supply to the bathtub is stopped, the control device sets the opening of the mixing valve to an opening corresponding to the hot water set temperature, thereby immediately stopping the hot water supply to the bathtub and hot water supply. Even if hot water is supplied to the terminal, fluctuations in the hot water supply temperature with respect to the hot water supply set temperature can be suppressed, and hot water having a stable hot water supply set temperature can be discharged from the hot water supply terminal.

Moreover, in the hot water supply apparatus of one embodiment,
The control device sets the current opening of the mixing valve when the temperature of the mixed water from the mixing valve substantially coincides with the set hot water temperature for a predetermined time during hot water supply to the hot water supply terminal. It has a hot water supply stable opening degree determination part which makes the hot water supply stable opening degree corresponding to temperature.

  According to the above-described embodiment, the hot water supply stable opening degree determination unit opens the mixing valve when the temperature of the mixed water from the mixing valve substantially coincides with the set hot water temperature for a predetermined time during hot water supply to the hot water supply terminal. By adjusting the degree to the hot water supply stable opening corresponding to the hot water supply set temperature, it is possible to accurately adjust the opening of the mixing valve with respect to the hot water supply set temperature.

Moreover, in the hot water supply apparatus of one embodiment,
When the hot water supply to the bathtub is stopped, the control device closes the opening / closing means and then sets the opening of the mixing valve to an opening corresponding to the hot water supply set temperature.

  According to the above embodiment, when stopping the hot water supply to the bathtub, the control device closes the opening and closing means of the bath hot water supply circuit, and then sets the opening of the mixing valve to an opening corresponding to the hot water supply set temperature. The mixed water that has reached the hot water supply set temperature from the mixing valve until the bath hot water supply circuit is closed is not supplied to the bathtub.

  As is apparent from the above, according to the present invention, when hot water supply to the bathtub is stopped and hot water supply terminal is supplied, a hot water supply apparatus that can suppress fluctuations in the hot water supply temperature with respect to the hot water supply set temperature can be realized.

FIG. 1 shows a piping system diagram of a heat pump type hot water supply apparatus according to the first embodiment of the present invention. FIG. 2 is a control block diagram of the hot water supply apparatus. FIG. 3 is a flowchart for explaining the operation of the controller for the hot water supply apparatus. FIG. 4 is a flowchart following FIG.

  Hereinafter, a hot water supply apparatus of the present invention will be described in detail with reference to embodiments shown in the drawings.

[First Embodiment]
FIG. 1 shows a piping system diagram of a heat pump type hot water supply apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, the hot water supply apparatus according to the first embodiment includes a hot water storage unit 1 and a heat pump unit 2 connected to the hot water storage unit 1. The hot water storage unit 1 includes a hot water storage tank 3, a boiling heat exchanger 10, a reheating heat exchanger 20, a control device 100 (shown in FIG. 2), and the like.

  One end of the pipe L1 is connected to the lower part of the hot water storage tank 3, and the other end of the pipe L1 is connected to the first water inlet port of the boiling mixing valve 50. One end of the pipe L <b> 2 is connected to the water outlet port of the boiling mixing valve 50, and the other end of the pipe L <b> 2 is connected to one end of the boiling heat exchanger 10. Further, the other end of the boiling heat exchanger 10 is connected to one end of the pipe L <b> 3, and the other end of the pipe L <b> 3 is connected to the upper part of the hot water storage tank 3. A boiling circulation pump P1 as an example of a boiling pump is disposed in the pipe L2.

  The piping L1, piping L2, boiling heat exchanger 10, and piping L3 constitute a boiling circuit.

  By driving the boiling circulation pump P1 with the opening degree of the first mixing port 50 (hot water storage tank 3 side) of the boiling mixing valve 50 fully opened, the hot water in the hot water storage tank 3 is connected to the pipe L1. , The mixture is circulated through the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3.

  The boiling heat exchanger 10 is connected to the heat pump unit 2 via the refrigerant pipes L4 and L5. The heat pump unit 2 uses an HFC refrigerant, and can control the temperature of the hot water of the boiling heat exchanger 10 in a range of, for example, 50 ° C to 70 ° C. Examples of the HFC refrigerant used in the heat pump unit 2 include R32, R125, R134a, R404A, R410A, and R407C.

  Next, an external water supply pipe (not shown) is connected to the lower part of the hot water storage tank 3 via a pipe L11. A pressure reducing valve 11 and a check valve 12 are arranged in this pipe L11 in order from the upstream side. This check valve 12 allows only the flow from the water supply pipe side to the hot water storage tank 3 side.

  In addition, one end of the pipe L21 is connected to the upper part of the hot water storage tank 3, and the other end of the pipe L21 is connected to a primary water inlet port of the memory heat exchanger 20. One end of the pipe L22 is connected to the primary water outlet port of the additional heat exchanger 20, and the other end of the pipe L22 is connected to the second water inlet port of the boiling mixing valve 50.

  The piping L21, the reheating heat exchanger 20, and the piping L22 constitute a bath reheating circuit.

  By driving the boiling circulation pump P1 with the opening on the second water inlet port side (bath reheating circuit side) of the boiling mixing valve 50 fully open, the hot water in the hot water storage tank 3 is removed. And circulating through the pipe L21, the reheating heat exchanger 20 (primary side), the pipe L22, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3.

  Further, one end of the pipe L31 is connected to the upper part of the hot water storage tank 3, and the other end of the pipe L31 is connected to the first water inlet port of the hot water supply mixing valve 22. The hot water mixing valve 22 is an example of the mixing valve of the present invention. A check valve 21 that allows only a flow from the hot water storage tank 3 side to the hot water supply mixing valve 22 is disposed in the pipe L31. Further, one end of the branch pipe L12 is connected to the second water inlet port of the hot water mixing valve 22, and the other end of the branch pipe L12 is connected between the pressure reducing valve 11 and the check valve 12 of the pipe L11. . The branch pipe L12 is provided with a check valve 23 that allows only the flow from the pipe L11 side to the hot water supply mixing valve 22.

  One end of the pipe L32 is connected to the water outlet port of the hot water supply mixing valve 22, and the other end of the pipe L32 is connected to the hot water supply terminal 60. A water amount sensor 24 is disposed in the pipe L32. Although the hot water supply terminal 60 shown in FIG. 1 is a faucet, in this embodiment, the hot water supply terminal 60 includes a faucet, a shower, and the like.

  The branch pipe L12, the pipe L31, the pipe L32, the check valve 21, the hot water supply mixing valve 22, the check valve 23, and the water amount sensor 24 constitute a hot water supply circuit for supplying hot water to the hot water supply terminal 60.

  The hot water supply mixing valve 22 is a pulse-driven mixing valve driven by a stepping motor (not shown). The ratio of the flow rate of the first water inlet port (hot water storage tank 3 side) to the flow rate of the second water inlet port (water supply side) of the hot water supply mixing valve 22 is the opening degree 0% to 100% (for example, driving) It is controlled by adjusting the pulses 0-1800).

  One end of the pipe L33 is connected to the upstream side of the water amount sensor 24 of the pipe L32, and the other end of the pipe L33 is connected to the hot water supply port 9a of the connection adapter 9 provided in the bathtub 4. In order from the upstream side of the pipe L33, a hot water filling electromagnetic valve 25, a check valve 26, a water amount sensor 27, and a check valve 28 are provided as an example of an opening / closing means. These check valves 26 and 28 allow only the flow from the hot water supply mixing valve 22 side to the bathtub 4.

  The pipe L33, the hot water solenoid valve 25, the check valves 26 and 28, and the water amount sensor 27 constitute a bath hot water supply circuit branched from the hot water supply pipe L32 and connected to the bathtub 4.

  One end of the pipe L35 is connected to the intake water inlet 9b for the replenishment of the connection adapter 9, and the other end of the pipe L35 is connected to the water inlet port on the secondary side of the retreat heat exchanger 20. A circulation pump P2 for bath is disposed in the pipe L35. In addition, one end of the pipe L34 is connected to the downstream side of the water amount sensor 27 of the pipe L33, and the other end of the pipe L34 is connected to the secondary water outlet port of the remedy heat exchanger 20.

  The hot water in the bathtub 4 is circulated through the pipe L35, the memorial heat exchanger 20 (secondary side), the pipe L34, and the pipe L33 (part) by the bath circulation pump P2.

  The above-mentioned pipe L35, additional heat exchanger 20 (secondary side), pipe L34, and pipe L33 (part) constitute a bath circulation circuit.

  Furthermore, one end of the pipe L41 is connected to the pipe L21, and the other end of the pipe L41 is connected to the drain port. A relief valve 31 is provided in the pipe L41.

  The hot water storage tank 3 is provided with four temperature sensors T1 to T4 at substantially equal intervals from the lower side to the upper side. In addition, a temperature sensor T11 for detecting the incoming water temperature is provided in the pipe L2, and a temperature sensor T12 for detecting the hot water temperature is provided in the pipe L3. The temperature sensor T11 is an example of an incoming water temperature sensor, and the temperature sensor T12 is an example of a tapping temperature sensor.

  The boiling heat exchanger 10 is provided with a temperature sensor T13. The pipe L32 connected to the hot water supply terminal 60 is provided with a temperature sensor T21 that detects the hot water supply temperature downstream of the water amount sensor 24. In addition, a water level sensor LS, a water flow switch SW, and a temperature sensor T23 are connected to the pipe L35 connected to the bathtub 4 from the connection adapter 9 side between the connection adapter 9 on the bathtub 4 side and the circulation pump P2 for bath. In order. Furthermore, a temperature sensor T22 that detects the temperature of hot water supplied to the bathtub 4 is provided downstream of the check valve 28 of the pipe L33 connected to the bathtub 4 and at a connection point between the pipe L33 and the pipe L34. Yes.

  FIG. 2 is a control block diagram of the hot water supply apparatus. As shown in FIG. 2, the hot water supply device includes a control device 100 including a microcomputer and an input / output circuit, and a remote controller 200 that transmits and receives signals to and from the control device 100. The control device 100 includes signals from temperature sensors T1 to T4, T11 to T13, T21 to T23, a water level sensor LS, a water flow switch SW, water volume sensors 24 and 27, an outside air temperature sensor (not shown), a remote controller 200, and the like. In response, the heat pump unit 2, the boiling circulation pump P1, the bath circulation pump P2, the hot water supply mixing valve 22, the hot water filling electromagnetic valve 25, the boiling mixing valve 50, and the like are controlled.

Further, the control device 100 includes a boiling control unit 100a that controls an operation of boiling hot water in the hot water storage tank 3, a hot water supply control unit 100b that controls a hot water supply temperature of the hot water supply terminal 60, a “bath hot water operation”, and the like. The bath pouring control unit 100c for controlling the pouring of hot water into the bathtub 4 including the bath, the bath pouring control unit 100d for controlling the “bath chasing operation”, and the hot water supply mixing temperature 22 corresponding to the hot water set temperature t _KS Mixing valve opening estimation unit 100e that estimates the opening, hot water supply stable opening determination unit 100f that determines a hot water supply stable opening as an opening corresponding to hot water set temperature t _KS of hot water mixing valve 22, and time measurement Timer 100g.

<Hot water supply operation>
In the hot water supply apparatus having the above-described configuration, in the “hot water supply operation” for controlling the hot water supply temperature of the hot water supply terminal 60, hot water discharged from the upper part of the hot water storage tank 3 and water supplied from the external water supply pipes via the pipes L11 and L12 are used. Hot water at a desired temperature is supplied to the hot water supply terminal 60 by mixing with the hot water supply mixing valve 22. At this time, the opening degree of the hot water supply mixing valve 22 is controlled by the hot water supply control unit 100b of the control device 100 so that the hot water supply temperature detected by the temperature sensor T21 becomes the hot water supply set temperature _tKS .

<Boiling operation>
In the “boiling operation” in which hot water in the hot water storage tank 3 is boiled by the heat pump unit 2, the boiling control unit 100 a of the control device 100 causes the first mixing port 50 side (hot water storage tank 3 side) of the boiling mixing valve 50. The boiling circulation pump P1 is operated with the opening degree of fully opened, and the hot water in the hot water storage tank 3 is supplied to the pipe L1, the boiling mixing valve 50, the pipe L2, the boiling heat exchanger 10, and the pipe L3. Circulate through.

The heating-up control unit 100a, the heating-up during operation, so that hot water temperature detected by the temperature sensor T12 becomes boiling on a target hot water temperature t _SS, controls the heat pump unit 2 and boiling above circulation pump P1. Here, the boiling target hot water temperature t _SS is calculated by the control device 100 based on the amount of hot water supplied from the hot water storage tank 3 and the like. For example, when the amount of hot water used is large, the boiling target hot water temperature t _SS is as high as 70 ° C., for example, and when the amount of hot water used is small, the boiling target hot water temperature t _SS is as low as 50 ° C., for example.

<Bath bathing operation and bath addition bath operation>
Next, when performing “bath hot water operation” or “bath hot water operation” for supplying hot water from the hot water storage tank 3 into the bath tub 4, the hot water solenoid valve 25 is operated by the bath pouring controller 100 c of the control device 100. The hot water in the hot water storage tank 3 is supplied into the bathtub 4 through the hot water mixing valve 22 and the bath hot water supply circuit (L33, 25, 26, 27, 28). In this case, bath pouring control unit 100c controls the hot-water supply mixing valve 22, based on the bath set temperature t _BS, hot water supply mixing valve and the water supply from the high-temperature hot water and the outside from the hot water storage tank 3 22 When the integrated value of the flow rate detected by the water amount sensor 27 reaches the set amount of hot water, the hot water solenoid valve 25 is closed to complete the bath hot water operation. The bath hot water filling operation is executed while the hot water filling operation is interrupted 2 to 3 times (by closing the hot water solenoid valve 25).

<Bath memorial operation>
Next, when performing a “bath chasing operation” in which the hot water in the bath tub 4 is chased from the hot water storage tank 3, the hot water filling electromagnetic valve 25 is closed by the bath chasing control unit 100 d of the control device 100. In this state, the bath circulation pump P2 is operated to circulate the hot water in the bathtub 4 through the bath circulation circuit.

  Then, based on the bath temperature of the hot water in the bathtub 4 detected by the temperature sensor T23, the bath chasing control unit 100d does not use the heat pump unit 2 and bath chasing operation using the hot water in the hot water storage tank 3 as a heat source. When the amount of heat in the hot water storage tank 3 is not sufficient, the bath pumping operation is performed using the heat pump unit 2.

  In the bath chasing operation, hot water from the boiling heat exchanger 10 is heated by the boiling circulation pump P1, the hot water storage tank 3, the boiling circuit (L1, L2, 10, L3), and the bath chasing circuit (L21, 20, Recirculate through L22) to retreat the bath.

  In addition, when performing the bath chasing operation using the heat pump unit 2, it may be performed in a state in which the opening on the second water inlet port side (the bath chasing circuit side) of the boiling mixing valve 50 is fully opened, In order to improve the heating efficiency of the heat pump unit 2, the opening degree of the mixing valve 50 for boiling is controlled to boil back hot water from the additional heat exchanger 20 and hot water from the lower part of the hot water storage tank 3. You may mix by the mixing valve 50 for use.

  Hereinafter, according to the flowcharts shown in FIGS. 3 and 4, the operation of the control device 100 during the bathing operation will be described. In FIGS. 3 and 4, the same operation is performed as a bath addition hot water operation instead of the bath hot water operation.

  First, when the hot water filling operation starts, it is determined in step S1 shown in FIG. 3 whether or not there is a hot water request. If it is determined that there is a hot water request, the process proceeds to step S2. This bath hot water operation is automatically requested by the user pressing a button on the remote controller 200 or by making a bath reservation.

Then, the opening degree corresponding to the hot water supply mixing valve 22 to a bath set temperature t _BS by bath pouring control section 100c at step S2.

  Next, proceeding to step S3, the hot water filling electromagnetic valve 25 is opened by the bath pouring control unit 100c. Thereby, the hot water in the hot water storage tank 3 is supplied into the bathtub 4 through the hot water mixing valve 22 and the bath hot water supply circuit (L33, 25, 26, 27, 28).

  Next, it progresses to step S4 and the bath hot water temperature is detected by the temperature sensor T22. Here, the bath hot water temperature is the temperature of the mixed water from the hot water mixing valve 22 supplied into the bathtub 4 through the bath hot water circuit (L33, 25, 26, 27, 28).

Then, the process proceeds to step S5, as the bath hot-water supply temperature becomes bath set temperature t _BS, and controls the opening degree of the hot water supply mixing valve 22 by the bath pouring control section 100c. That is, a bath hot-water supply temperature detected by the temperature sensor T22 is such that a bath set temperature t _BS, the feedback control of the opening degree of the hot water supply mixing valve 22 (hot water storage tank 3 side).

  Next, it progresses to step S6 and it is determined whether it is a bath hot water supply interruption or completion | finish. In this case, if it is determined that the integrated value of the flow rate detected by the water amount sensor 27 has reached the bath water setting amount, or if it is determined that the bath filling operation has been completed by operating the button of the remote controller 200, the bath filling is performed. End.

  If it is determined in step S6 that the bath hot water filling is finished, the process proceeds to step S11, the hot water filling electromagnetic valve 25 is closed by the bath pouring control unit 100c, the process proceeds to step S12, and the hot water mixing valve 22 is opened to the stable hot water supply opening. This process is then terminated. In steps S6, S11, and S12, when hot water supply to the hot water supply terminal 60 is not performed during bath hot water filling and bath hot water filling is interrupted or terminated independently, After closing the tension electromagnetic valve 25, the hot water supply mixing valve 22 is set to a stable hot water supply opening, so that hot water other than the bath set temperature is not supplied to the bathtub 4.

Here, the initial value of the hot water supply stable opening is equivalent to the hot water temperature in the upper portion of the hot water storage tank 3 detected by the temperature sensor T4 and the lower water temperature in the hot water storage tank 3 detected by the temperature sensor T1 (corresponding to the water supply temperature). ) And the hot water supply set temperature t _KS , the mixing valve opening estimation unit 100e estimates using a formula or a table.

  On the other hand, if it is determined in step S6 that the bath hot water is not finished, the process proceeds to step S7, and it is determined whether or not there is hot water supply. That is, when the hot water supply terminal 60 is opened and mixed water is discharged from the hot water mixing valve 22 through the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24), the water amount is detected by the water amount sensor 24. And determine that there is hot water.

  If it is determined in step S7 that hot water is present, the process proceeds to step S8. If it is determined in step S7 that hot water is not present, the process returns to step S4.

  In step S8, the hot water supply mixing valve 22 is set to a stable hot water supply opening, and the process proceeds to step S9 to wait for a predetermined time (several seconds in this embodiment) to elapse.

  Next, the process proceeds to step S10, the hot water filling electromagnetic valve 25 is closed by the bath pouring controller 100c, and the process proceeds to step S21 shown in FIG. In steps S7, S8, S9, and S10, when hot water supply to the hot water supply terminal 60 is detected during bath hot water filling and the hot water bath is interrupted, the hot water mixing valve 22 is first set to quickly adjust to the hot water supply set temperature. Move to a stable hot water supply opening. In order to prevent the hot water from the hot water mixing valve 22 from being supplied to the hot water supply terminal 60 while the hot water mixing valve 22 is driven from the opening corresponding to the bath set temperature to the hot water supply stable opening, 25 is left open for several seconds, and hot water while the hot water supply mixing valve 22 is being driven flows as far as possible to the bathtub 4 side.

In general,
Since the bath water filling flow rate is greater than the faucet flow rate, the temperature fluctuation of the faucet (hot water supply terminal 60) can be minimized. On the bathtub 4 side, hot water while driving the hot water mixing valve 22 (opening corresponding to the bath set temperature → hot water supply stable opening) is allowed to flow to the bathtub 4 side for several seconds to a place where about 200 liters of hot water is accumulated. Therefore, there is almost no influence on the bathtub 4.

  In step S21 shown in FIG. 4, the timer 100g is started.

  Next, it progresses to step S22 and the hot water supply temperature is detected by the temperature sensor T21. Here, the hot water supply temperature is the temperature of the mixed water from the hot water supply mixing valve 22 supplied via the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24).

Next, it progresses to step S23 and the opening degree of the hot water supply mixing valve 22 is controlled by the hot water supply control part 100b so that the hot water supply temperature becomes the hot water supply set temperature _tKS .

Next, the process proceeds to step S24, and when the hot water supply temperature is approximately equal to the hot water supply set temperature t _KS , the process proceeds to step S25, while when the hot water supply temperature is not approximately equal to the hot water supply set temperature t _KS , the process returns to step S1. Here, “the hot water supply temperature is substantially equal to the hot water supply set temperature t _KS ” means, for example, that the condition that the hot water supply temperature is within the range of the hot water supply set temperature t _KS ± 0.3 ° C. is satisfied.

When the time count _{T m} of a timer 100g is determined to be the predetermined time _{T SET} over in step S25, the process proceeds to step S28, the hot water supply stable opening the current opening degree of the hot water supply mixing valve 22 by the hot water supply stable opening determining unit 100f Return to step S21. Here, the hot water supply stable opening is stored in a nonvolatile memory.

On the other hand, when the time measurement _{T m} of a timer 100g is determined to be less than the predetermined time _{T SET} in step S25, the process proceeds to step S26.

  If it is determined in step S26 that the hot water supply has been completed, the process proceeds to step S27. If it is determined that the hot water supply has not been completed, the process returns to step S22.

  Next, in step S27, it is determined whether or not to resume bathing. In this step S27, it is determined in step S7 shown in FIG. 3 that hot water is supplied in the middle of the bath hot water filling, and it is determined that the bath hot water filling is resumed when the bath hot water filling operation is interrupted.

  If it is determined in step S27 that the hot water bathing is resumed, the process returns to step S2 shown in FIG. 3, while if it is determined that the hot water bathing is not restarted, this process is terminated.

According to the hot water supply apparatus configured as described above, during the hot water supply operation in which hot water is supplied from the hot water supply terminal 60, the hot water control valve 100 of the control device 100 controls the hot water supply mixing valve 22 so that the mixed water from the hot water supply mixing valve 22 is supplied with hot water. At the time of setting to the set temperature t _KS and at the time of the bath hot water filling operation (or bath addition hot water operation) for supplying hot water to the bathtub 4, the hot water supply mixing valve 22 is controlled by the bath pouring controller 100c of the control device 100. , mixed water from the hot water supply mixing valve 22 is made to be a bath set temperature t _BS. When the hot water supply to the bathtub 4 is stopped in the bath hot water operation (bath addition hot water operation), the opening degree of the hot water mixing valve 22 (on the hot water storage tank 3 side) is set to the opening side corresponding to the hot water supply set temperature _tKS. By doing so, the hot water mixing valve 22 can be quickly _opened to correspond to the hot water supply set temperature t _KS , and when the hot water supply to the bathtub 4 is stopped and hot water is immediately supplied from the hot water supply terminal 60, the hot water supply set temperature t _KS Variations in the hot water supply temperature can be suppressed.

For example, when the hot water supply set temperature t _KS is 40 ° C. and the bath set temperature t _BS is 38 ° C., the hot water filling to the bathtub 4 with the mixed water of 38 ° C. from the hot water supply mixing valve 22 is completed. Immediately after the valve 25 is closed, the opening degree of the hot water mixing valve 22 (on the hot water storage tank 3 side) is set to 40 ° C. (hot water setting temperature t _KS ) above the opening degree corresponding to 38 ° C. (bath setting temperature t _BS ). The temperature of the mixed water from the hot water mixing valve 22 is immediately changed from 38 ° C. to 40 ° C., and 38 ° C. lukewarm water is not discharged from the shower. You can avoid discomfort.

When the hot water supply set temperature t _KS is 40 ° C. and the bath set temperature t _BS is 38 ° C., a shower is made at the hot water supply terminal 60 during the filling of the bathtub 4 with the 38 ° C. mixed water from the hot water mixing valve 22. When used, the opening degree of the hot water supply mixing valve 22 (on the hot water storage tank 3 side) is opened corresponding to 40 ° C. (hot water supply set temperature t _KS ) rather than the opening degree corresponding to 38 ° C. (bath set temperature t _BS ). By closing the hot water filling solenoid valve 25 after a predetermined time, 38 ° C. lukewarm water from the hot water mixing valve 22 flows to the bathtub 4 side while the hot water mixing valve 22 is being driven. The lukewarm water is not discharged from the shower, so that the user is not uncomfortable.

Further, when hot water supply to the bathtub 4 is stopped in the bath hot water operation (bath addition hot water operation), the opening degree of the hot water mixing valve 22 is set to an opening degree corresponding to the hot water supply set temperature t _KS . Even if hot water supply is stopped and hot water is supplied from the hot water supply terminal 60, fluctuations in the hot water supply temperature with respect to the hot water supply set temperature t _KS can be suppressed, and hot water having a stable hot water supply set temperature t _KS can be discharged from the hot water supply terminal 60.

In addition, when the hot water supply stable opening degree determination unit 100f supplies hot water to the hot water supply terminal 60, the temperature of the mixed water from the hot water supply mixing valve 22 substantially coincides with the hot water supply set temperature t _KS for a predetermined time T _SET . the current opening degree of the hot water supply mixing valve 22, by a hot water supply stable opening degree corresponding to the hot water set temperature t _KS, be performed adjustment of the opening degree of the hot water supply mixing valve 22 for hot water set temperature t _KS accurately it can.

The mixing an opening degree based on the temperature and the hot water set temperature t _KS of the water supplied from the hot water temperature and the outside of the upper portion of the hot water storage tank 3, corresponding to the hot water set temperature t _KS of the hot water supply mixing valve 22 By estimating by the valve opening degree estimation unit 100e, it is possible to adjust the opening degree of the hot water mixing valve 22 with respect to the hot water supply set temperature t _KS without detecting the temperature of the mixed water from the actual hot water mixing valve 22. Become.

Further, when hot water supply to the bathtub 4 is started in the bath hot water operation (or bath hot water operation), the opening degree of the hot water mixing valve 22 (on the hot water storage tank 3 side) is controlled by the bath pouring control unit 100c of the control device 100. from in the opening degree corresponding to the bath set temperature _{t BS,} by the bath hot water supply circuit (L33,25,26,27,28) hot water filling solenoid valve 25 of the open state, the bath hot water supply circuit (L33, the temperature of the mixed water from the hot water supply mixing valve 22 immediately open the 25, 26, 27, 28) can be promptly to the bath set temperature t _BS.

In addition, when hot water supply to the bathtub 4 is stopped during the bath hot water operation (or bath hot water operation), the hot water solenoid valve 25 is closed by the bath pouring controller 100c of the control device 100, and then hot water is supplied. by the opening degree corresponding to the degree of opening of the hot water supply mixing valve 22 (hot water storage tank 3 side) to the hot water set temperature _{t KS} by the control unit 100b, closing the bath hot water supply circuit (L33,25,26,27,28) The mixed water that has reached the hot water supply set temperature t _KS from the hot water supply mixing valve 22 is not supplied to the bathtub 4 by the time.

In the first embodiment, the initial value of the hot water supply stable opening is estimated by the mixing valve opening estimation unit 100e, and when hot water supply at the hot water supply set temperature t _KS continues, the hot water supply stable opening determining unit 100f stably opens the hot water supply. However, the mixing valve opening estimator is not limited to the estimation of the initial value of the hot water supply stable opening, but the hot water stable opening of the mixing valve estimated by the mixing valve opening estimator in the hot water operation May be used.

[Second Embodiment]
The hot water supply apparatus according to the second embodiment of the present invention has the same configuration as the hot water supply apparatus according to the first embodiment except for the operation of the control device 100, and FIGS.

  The operation of the hot water supply apparatus of the second embodiment is different in steps S8 and S12 of the flowchart shown in FIG.

While the hot water supply mixing valve 22 is set to the stable hot water supply opening in steps S8 and S12 of the first embodiment, the opening of the hot water mixing valve 22 is set to the bath set temperature t in the hot water supply apparatus of the second embodiment. _The opening is set to correspond to the temperature between the _BS and the hot water supply set temperature _tKS .

For example, intermediate temperature between the hot water mixing valve 22, the opening degree corresponding to the temperature between the bath set temperature t _BS and hot water set temperature t _KS, the bath set temperature t _BS and hot water set temperature t _KS The opening may correspond to (t _BS + t _KS ) / 2, or the opening may correspond to the temperature on the hot water supply set temperature t _KS side by a predetermined temperature from the bath set temperature t _BS .

According to the hot water supply apparatus having the above structure, when the user stops the hot water supply to the tub 4 in the bath hot water filling operation (bath adding hot water operation), the bath set the opening degree of the hot water supply mixing valve 22 temperature t _BS and hot water set temperature t _KS When the hot water supply to the bathtub 4 is stopped and hot water is immediately supplied to the hot water supply terminal 60, the hot water supply mixing valve 22 is driven to quickly set the hot water supply temperature t. It becomes possible to make the opening corresponding to _KS, and the fluctuation of the hot water supply temperature with respect to the hot water supply set temperature t _KS can be suppressed.

  The hot water supply device of the second embodiment has the same effect as the hot water supply device of the first embodiment.

[Third Embodiment]
The hot water supply device of the third embodiment of the present invention has the same configuration as the hot water supply device of the first embodiment except for the operation of the control device 100, and FIGS.

  The operation of the hot water supply apparatus of the second embodiment is different in steps S11 and S12 of the flowchart shown in FIG.

  In steps S11 and S12 of the first embodiment, the hot water supply mixing valve 22 is set to the stable hot water supply opening degree after the hot water filling electromagnetic valve 25 is closed, whereas in the hot water supply device of the third embodiment, the hot water supply device is used. After the mixing valve 22 is brought to the stable hot water supply opening, the hot water filling electromagnetic valve 25 is closed.

According to the hot water supply apparatus having the above configuration, when hot water supply to the bathtub 4 is stopped during bath hot water operation (or bath addition hot water operation), the hot water supply control unit 100b of the control device 100 opens the hot water supply mixing valve 22. The hot water storage tank 3 side is set to an opening corresponding to the hot water supply set temperature t _KS , and then the hot water filling electromagnetic valve 25 is closed by the bath pouring control unit 100c, thereby making the bath hot water supply circuit (L33, 25 , 26, 27, 28) Since the mixed water of the hot water supply set temperature t _KS flows from the hot water supply mixing valve 22 to the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) until the hot water supply mixing valve 22 is closed. rising from the valve 22 to the hot water set temperature t _KS of mixed water which is hot water from the hot water supply terminal 60 becomes faster.

  The hot water supply device of the third embodiment has the same effect as the hot water supply device of the first embodiment.

  In the first to third embodiments, the hot water supply apparatus including the boiling-up mixing valve 50 for mixing the return hot water from the reheating heat exchanger 20 and the hot water from the lower part of the hot water storage tank 3 has been described. You may apply this invention to the hot-water supply apparatus which comprised the boiling circuit and the bath reheating circuit separately, without using the upper mixing valve.

  Moreover, although the said 1st-3rd embodiment demonstrated the hot water supply apparatus provided with the mixing valve 50 for boiling, not only a mixing valve but the flow-path switching valve which switches a flow path may be sufficient. The flow path switching valve may have a configuration in which one of the electromagnetic valves provided in each of the two water inlet side pipes to be switched is opened and the other is closed.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to third embodiments, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Hot water storage unit 2 ... Heat pump unit 3 ... Hot water storage tank 4 ... Bathtub 9 ... Connection adapter 9a ... Hot water inlet 9b ... Water intake for remedy 10 ... Boiling heat exchanger 11 ... Pressure reducing valve 12, 21, 23, 26, 28 ... Check valve 20 ... Remembrance heat exchanger 22 ... Hot water mixing valve 24, 27 ... Water volume sensor 25 ... Hot water filling solenoid valve 31 ... Relief valve 50 ... Elevating mixing valve 60 ... Hot water supply terminal 100 ... Control device 100a ... Boiling control unit 100b ... Hot water supply control unit 100c ... Bath pouring control unit 100d ... Bath bath control unit 100e ... Mixing valve opening estimation unit 100f ... Hot water supply stable opening determination unit 100g ... Timer 200 ... Remote controllers L1, L2 , L3, L11, L21, L22, L31 to L35, L41 ... Piping L4, L5 ... Refrigerant piping L12 ... Branch piping LS ... Water level sensor P1 ... Boiling circulation pump P2 ... Bath circulation pump SW ... Water flow Switch T1~T4, T11~T13, T21~T23 ... temperature sensor

Claims (7)

A hot water storage tank (3),
A mixing valve (22) for mixing hot water from the upper part of the hot water storage tank (3) and water from the outside;
A hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) for supplying hot water from the upper part of the hot water storage tank (3) to the hot water supply terminal via the mixing valve (22);
Bath hot water supply circuit (L33, 25, 26, 27) for branching downstream of the mixing valve (22) of the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) and supplying hot water to the bathtub , 28) and
Opening and closing means (25) for opening and closing the bath hot water supply circuit (L33, 25, 26, 27, 28);
A control device (100) for controlling the mixing valve (22) and the opening / closing means (25);
The control device (100)
When supplying hot water to the hot water supply terminal, the mixing valve (22) is controlled so that the mixed water from the mixing valve (22) becomes a hot water supply set temperature, and when supplying hot water to the bathtub, the mixing valve ( The mixing valve (22) is controlled so that the mixed water from 22) reaches the bath set temperature.
When the hot water supply to the bathtub is stopped, the opening of the mixing valve (22) is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature ,
When the hot water supply to the bathtub is stopped, the control device (100) sets the opening of the mixing valve (22) to an opening corresponding to the temperature between the bath set temperature and the hot water set temperature. A water heater characterized by that. A hot water storage tank (3),
A mixing valve (22) for mixing hot water from the upper part of the hot water storage tank (3) and water from the outside;
A hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) for supplying hot water from the upper part of the hot water storage tank (3) to the hot water supply terminal via the mixing valve (22);
Bath hot water supply circuit (L33, 25, 26, 27) for branching downstream of the mixing valve (22) of the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) and supplying hot water to the bathtub , 28) and
Opening and closing means (25) for opening and closing the bath hot water supply circuit (L33, 25, 26, 27, 28);
A control device (100) for controlling the mixing valve (22) and the opening / closing means (25);
With
The control device (100)
When supplying hot water to the hot water supply terminal, the mixing valve (22) is controlled so that the mixed water from the mixing valve (22) becomes a hot water supply set temperature, and when supplying hot water to the bathtub, the mixing valve ( The mixing valve (22) is controlled so that the mixed water from 22) reaches the bath set temperature.
When the hot water supply to the bathtub is stopped, the opening of the mixing valve (22) is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature,
The control device (100) sets the hot water supply set temperature of the mixing valve (22) based on the temperature of the hot water in the upper part of the hot water storage tank (3), the temperature of the external water, and the hot water set temperature. A hot water supply apparatus comprising a mixing valve opening degree estimation unit (100e) for estimating a corresponding opening degree. A hot water storage tank (3),
A mixing valve (22) for mixing hot water from the upper part of the hot water storage tank (3) and water from the outside;
A hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) for supplying hot water from the upper part of the hot water storage tank (3) to the hot water supply terminal via the mixing valve (22);
Bath hot water supply circuit (L33, 25, 26, 27) for branching downstream of the mixing valve (22) of the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) and supplying hot water to the bathtub , 28) and
Opening and closing means (25) for opening and closing the bath hot water supply circuit (L33, 25, 26, 27, 28);
A control device (100) for controlling the mixing valve (22) and the opening / closing means (25);
With
The control device (100)
When supplying hot water to the hot water supply terminal, the mixing valve (22) is controlled so that the mixed water from the mixing valve (22) becomes a hot water supply set temperature, and when supplying hot water to the bathtub, the mixing valve ( The mixing valve (22) is controlled so that the mixed water from 22) reaches the bath set temperature.
When the hot water supply to the bathtub is stopped, the opening of the mixing valve (22) is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature,
When the hot water supply to the bathtub is started, the control device (100) sets the opening of the mixing valve (22) to an opening corresponding to the bath set temperature, and then opens the opening / closing means (25). A hot water supply device characterized by that. A hot water storage tank (3),
A mixing valve (22) for mixing hot water from the upper part of the hot water storage tank (3) and water from the outside;
A hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) for supplying hot water from the upper part of the hot water storage tank (3) to the hot water supply terminal via the mixing valve (22);
Bath hot water supply circuit (L33, 25, 26, 27) for branching downstream of the mixing valve (22) of the hot water supply circuit (L12, L31, L32, 21, 22, 23, 24) and supplying hot water to the bathtub , 28) and
Opening and closing means (25) for opening and closing the bath hot water supply circuit (L33, 25, 26, 27, 28);
A control device (100) for controlling the mixing valve (22) and the opening / closing means (25);
With
The control device (100)
When supplying hot water to the hot water supply terminal, the mixing valve (22) is controlled so that the mixed water from the mixing valve (22) becomes a hot water supply set temperature, and when supplying hot water to the bathtub, the mixing valve ( The mixing valve (22) is controlled so that the mixed water from 22) reaches the bath set temperature.
When the hot water supply to the bathtub is stopped, the opening of the mixing valve (22) is set to the hot water supply set temperature side with respect to the opening corresponding to the bath set temperature,
When the controller (100) stops the hot water supply to the bathtub for hot water supply to the hot water supply terminal, the opening of the mixing valve (22) is set to an opening corresponding to the hot water supply set temperature, A hot water supply apparatus, wherein the opening / closing means (25) is closed. In the hot water supply device according to any one of claims 2 to 4 ,
When the hot water supply to the bathtub is stopped, the control device (100) sets the opening of the mixing valve (22) to an opening corresponding to the hot water set temperature. In the hot water supply device according to any one of claims 1 to 5 ,
The control device (100) is configured to mix the mixing valve (22) when a state in which the temperature of the mixed water from the mixing valve (22) substantially matches the hot water supply set temperature continues for a predetermined time when hot water is supplied to the hot water supply terminal. A hot water supply apparatus having a hot water supply stable opening degree determining unit (100f) that sets the current opening degree of the hot water supply as a stable hot water supply opening degree corresponding to the hot water supply set temperature. In the hot water supply device according to any one of claims 1 to 6,
When stopping the hot water supply to the bathtub, the control device (100) closes the opening / closing means (25), and then opens the opening of the mixing valve (22) to an opening corresponding to the hot water supply set temperature. A hot water supply apparatus characterized by the above.

Images