JP2018155469A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system capable of realizing bathroom drying operation enabling enhancement of convenience of a user.SOLUTION: A hot water supply system includes: a water heater that can execute waste heat recovery operation for recovering heat of bath water in a bathtub into a hot water storage tank; a bathroom dryer that can execute bathroom drying operation for drying a bathroom; and a control section for controlling the waste heat recovery operation and the bathroom drying operation. The control section determines whether or not an instruction for starting the waste heat recovery operation to the water heater has been issued. When issuance is determined, the waste heat recovery operation is started. Next, the control section determines whether or not the bathroom drying operation is being executed by the bathroom dryer. As a result, when execution is not determined, the bathroom drying operation by the bathroom dryer is automatically started.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a hot water supply system.

  For example, Patent Document 1 discloses a heat pump water heater that controls a bathroom dryer and a drain plug in conjunction with each other. More specifically, in this apparatus, by operating an opening button of the discharge port, the discharge port is opened and the bathroom dryer is automatically operated in the drying mode. According to such control, the trouble of separately performing an operation for drying the bathroom after the user leaves the bathroom is eliminated.

JP 2006-170561 A

  However, the above technique has the following problems. That is, it is desirable that the bathroom drying is started as early as possible after the final bather leaves the bathroom. However, it is assumed that the remaining hot water in the bathtub is used for, for example, a waste heat recovery operation. For this reason, in the above-described conventional technology that automatically starts bathroom drying in conjunction with the opening of the drain plug, there is a problem that the bathroom drying operation is not performed promptly when the waste heat recovery operation is performed.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a hot water supply system capable of realizing bathroom drying operation with improved user convenience.

  A hot water supply system according to the present invention includes a hot water heater capable of performing a waste heat recovery operation for recovering heat of bath water in a bathtub into a hot water storage tank, a bathroom dryer capable of executing a bathroom drying operation for drying the bathroom, A control unit capable of executing a linked operation for automatically starting a bathroom drying operation after starting or at the same time as the start of the waste heat recovery operation.

  According to the water heater of the present invention, the bathroom drying operation can be automatically started after the start of the waste heat recovery operation or at the same time as the start, so that the bathroom drying with improved user convenience can be realized. An object is to provide a hot water supply system that can be used.

1 is a configuration diagram of a hot water supply system according to Embodiment 1. FIG. 3 is an external view illustrating an example of a remote controller 44 according to Embodiment 1. FIG. FIG. 3 is a circuit configuration diagram of the hot water supply system 1 according to Embodiment 1 during a boiling operation. 2 is a circuit configuration diagram at the time of waste heat recovery operation in the hot water supply system 1 of Embodiment 1. FIG. 3 is a flowchart of a routine that is executed in the hot water supply system according to the first embodiment. 6 is a flowchart of a routine that is executed in the hot water supply system according to the second embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. However, the same reference numerals are given to common elements in the drawings, and redundant description is omitted. In the following embodiment, when referring to the number of each element, quantity, quantity, range, etc., unless otherwise specified or clearly specified in principle, the reference However, the present invention is not limited to these numbers. The structures described in the embodiments described below are not necessarily essential to the present invention unless otherwise specified or clearly specified in principle.

Embodiment 1 FIG.
[Configuration of Embodiment 1]
FIG. 1 is a configuration diagram of a hot water supply system according to Embodiment 1 of the present invention. The hot water supply system 1 includes a hot water storage type water heater 35, a bathroom dryer 41 that dries the bathroom 40, and a remote controller 44. The bathroom dryer 41 is an apparatus capable of performing a bathroom drying operation for introducing warm air or dry air into the bathroom 40 to dry the bathroom 40. The bathroom dryer 41 has a built-in control unit 42. The bathroom drying operation executed by the bathroom dryer 41 is controlled by the control unit 42.

  The water heater 35 includes a tank unit 33 that includes the hot water storage tank 8 and a heat pump unit 7 that uses a heat pump cycle. In the following description, the heat pump unit 7 is also referred to as an HP unit 7. In the present embodiment, a configuration in which the tank unit 33 and the heat pump unit 7 are separate members will be described as an example. However, instead of the configuration, the two may be integrated. The HP unit 7 and the tank unit 33 are connected via an HP outgoing pipe 14, an HP return pipe 15, and an electric wiring (not shown). A control unit 36 is built in the tank unit 33. The operation of actuators such as various valves and pumps provided in the tank unit 33 and the HP unit 7 is controlled by a control unit 36 electrically connected thereto. Hereinafter, each component of the water heater 35 will be described.

  The HP unit 7 is an example of a heating unit that heats water guided from the hot water storage tank 8 included in the tank unit 33. The heating means is not limited to the heat pump unit 7. The heating means may be a combustion heating device that heats with the combustion heat of a fuel such as gas, kerosene, heavy oil, or coal. The heating means may be a device that heats water by solar heat. The heating means may be a combination of a plurality of types of heating devices.

  The HP unit 7 includes a refrigerant circuit (all not shown) in which a compressor, a water-refrigerant heat exchanger, an expansion valve, and an air heat exchanger are connected in a ring shape with a refrigerant circulation pipe. The HP unit 7 operates the refrigeration cycle, that is, the heat pump cycle by circulating the refrigerant in the refrigerant circuit. In addition, in order to obtain high temperature water with the HP unit 7, it is preferable that the heat pump cycle is operated at a pressure exceeding the critical pressure using carbon dioxide as a refrigerant.

  The tank unit 33 incorporates the following various components and piping. The hot water storage tank 8 stores hot water. Inside the hot water storage tank 8, a temperature stratification in which the upper side is high and the lower side is low can be formed due to the difference in water density depending on the temperature. For convenience of explanation, an upper part, a middle part, and a lower part of the hot water storage tank 8 are defined. The middle part of the hot water storage tank 8 is a height portion between the upper part of the hot water storage tank 8 and the lower part of the hot water storage tank 8. The portions corresponding to 1/3 of the capacity of the hot water storage tank 8 may be regarded as the upper portion, the middle portion, and the lower portion, respectively, or the upper portion, the middle portion, and the lower portion may be determined at different positions. In the hot water storage tank 8, the upper, middle, and lower portions may be arranged in order from the upper side. In the present invention, when the hot water storage tank includes a plurality of tanks connected in series, the upper, middle, and lower portions are arranged in the entire hierarchy of the plurality of tanks from the highest tank to the lowest tank. You just have to decide.

  Connected to the lower part of the hot water storage tank 8 is a third water supply pipe 9c of a water supply pipe 9 for supplying low-temperature water that is supplied from a water source. The water supply pipeline 9 will be described later. Connected to the upper part of the hot water storage tank 8 is a first hot water supply pipe 21 for supplying hot water stored in the hot water storage tank 8 to the outside of the water heater 35.

  A heat source pump 12, a bath heat exchanger 20, and a bath circulation pump 29 are incorporated in the tank unit 33. The heat source pump 12 is a pump for circulating hot water through various pipes described later in the tank unit 33. The bath heat exchanger 20 is a heat exchanger for heating hot water stored in the hot water storage tank 8 using hot water in the bathtub 30. The bath heat exchanger 20 can also heat the hot water in the bathtub 30 using hot water supplied from the hot water storage tank 8 or the HP unit 7. In the present embodiment, as a secondary side configuration of the bath heat exchanger 20, a circulation circuit constituted by a bath piping 27 and a bath return piping 28 for circulating hot water in the bathtub 30 is provided. The bath circulation pump 29 is provided in the middle of the bath return pipe 28. The bath heat exchanger 20 is connected to the bathtub 30 through a bath piping 27 and a bath return piping 28, and a circulation circuit is formed by these.

  The three-way valve 11 is a flow path switching means having a and b ports through which hot water flows out and a c port through which hot water flows. The four-way valve 18 is a flow path switching means having b and c ports through which hot water flows in and a and d ports through which hot water flows out, and has four paths, ab, ac, bd and c. The flow path can be switched between −d. The tank unit 33 includes a first hot water supply pipe 13, a second hot water supply pipe 19, a hot water introduction pipe 20 a, a first bypass pipe 16, a hot water outlet pipe 20 b, and a second bypass pipe 17. The HP outgoing pipe 14 connects the inlet side of the HP unit 7 and the lower part of the hot water storage tank 8. The heat source pump 12 described above is provided in the HP outgoing pipe 14. The HP return pipe 15 connects the outlet side of the HP unit 7 and the c port of the four-way valve 18. The first hot water supply pipe 13 connects the d port of the four-way valve 18 and the c port of the three-way valve 11. The second hot water supply pipe 19 connects the a port of the three-way valve 11 and the middle of the first hot water supply pipe 21. The first bypass pipe 16 connects the a port of the four-way valve 18 and the lower or middle part of the hot water storage tank 8. The hot water introduction pipe 20 a connects the b port of the three-way valve 11 and the primary side inlet of the bath heat exchanger 20. The hot water outlet pipe 20 b connects the primary side outlet of the bath heat exchanger 20 and the middle part of the hot water storage tank 8. The second bypass pipe 17 branches from between the heat source pump 12 in the HP outgoing pipe 14 and the inlet side of the HP unit 7 and is connected to the b port of the four-way valve 18.

  Further, the tank unit 33 includes a first water supply pipe 9 a, a second water supply pipe 9 b, and a bath mixing valve 23. One end of the first water supply pipe 9a is connected to a water source such as tap water. A second water supply pipe 9 b and a third water supply pipe 9 c are connected to the other end of the first water supply pipe 9 a through a pressure reducing valve 31. A water supply pipe 9 is constituted by the first water supply pipe 9a, the second water supply pipe 9b, and the third water supply pipe 9c. The second water supply pipe 9b is connected to the water supply side port of the basin mixing valve 23. The water supplied from a water source such as a water supply through the first water supply pipe 9a is adjusted to a specified pressure by the pressure reducing valve 31, and then the lower part in the hot water storage tank 8 or the water supply side port of the water mixing valve 23 Flow into. The other end of the first hot water supply pipe 21 is connected to a port on the hot water supply side of the bath mixing valve 23. The second hot water supply pipe 25 connects the outlet side port of the bath mixing valve 23 and the middle of the bath going pipe 27. In the middle of the second hot water supply pipe 25, a bath solenoid valve 26 for opening and closing the second hot water supply pipe 25 is provided.

  The bath mixing valve 23 is for adjusting the flow rate ratio between the hot water supplied from the first hot water supply pipe 21 and the low temperature water supplied from the second hot water supply pipe 9b. The control unit 36 adjusts the flow rate ratio to generate hot water having a set temperature set by the user using the remote controller 44. The hot water adjusted to the set temperature by the bath mixing valve 23 is supplied from the second hot water supply pipe 25 to the bath 30 via the bath solenoid valve 26, the bath forward pipe 27, and the bath return pipe 28. The hot water supply device 35 is not limited to the means for supplying hot water to the bathtub 30, but by adjusting the flow rate ratio between the high temperature hot water supplied from the hot water storage tank 8 and the low temperature water supplied from the second water supply pipe 9 b. A means for supplying hot water to a hot water supply terminal such as a hot water tap may be further provided.

  The three-way valve 11 has two flow path forms, a form in which the first hot water supply pipe 13 and the second hot water supply pipe 19 communicate with each other, and a form in which the first hot water supply pipe 13 and the hot water introduction pipe 20a communicate with each other. The hot water flow path in the tank unit 33 is switched for use. The four-way valve 18 includes a form in which the HP return pipe 15 and the first hot water supply pipe 13 communicate with each other, a form in which the HP return pipe 15 and the first bypass pipe 16 communicate with each other, a first bypass pipe 16 and a second bypass pipe. The flow path of hot water in the tank unit 33 is switched and used in the form of four flow paths, that is, a form in which the first hot water supply pipe 13 and the second bypass pipe 17 communicate with each other.

  The remote controller 44 has a function of accepting a user operation relating to a change in driving operation command and set value. The remote controller 44 is an example of a terminal device or a user interface device. The control units 36 and 42 and the remote controller 44 are connected so as to be able to perform data communication in both directions by wire or wirelessly. In addition, the control part 36 and the control part 42 may be comprised so that mutual communication may be performed using communication means, such as HEMS (Home Energy Management System). The remote control 44 may be installed in the kitchen. The remote control 44 may be installed in a bathroom. A plurality of remote controllers 44 installed at different places may be provided.

  FIG. 2 is an external view showing an example of the remote controller 44 according to the first embodiment of the present invention. The remote controller 44 includes a display unit 44a, a speaker 44c, and an operation unit 44b having a switch operated by a user. The display unit 44a is configured by, for example, a liquid crystal display panel or an organic EL display panel. The display unit 44a can notify the user of information related to the operating state of at least one of the hot water heater 35 and the bathroom dryer 41 by displaying characters, figures, characters, and the like. The remote controller 44 can also notify the user by outputting voice guidance from the speaker 44c.

[Operation of Embodiment 1]
In the hot water supply system 1 according to the first embodiment, the three-way valve 11 and the four-way valve 18 are controlled according to the operation states shown in FIGS. 3 and 4 below, and the hot water flow path in the tank unit 33 is switched for use. It is like that. FIG. 3 is a circuit configuration diagram of the hot water supply system 1 according to Embodiment 1 during a boiling operation. The boiling operation here is an operation of boiling water in the hot water storage tank 8 using the HP unit 7. During this boiling operation, the three-way valve 11 is controlled so that the a port and the c port communicate with each other and the b port is closed. As a result, the first hot water supply pipe 13 and the second hot water supply pipe 19 communicate with each other, and the flow path to the bath heat exchanger 20 is blocked by closing the hot water introduction pipe 20a. In the boiling operation, the four-way valve 18 is controlled so that the c port and the d port communicate with each other and the a port and the b port are closed. As a result, the HP return pipe 15 and the first hot water supply pipe 13 communicate with each other, and the flow path to the lower part of the hot water storage tank 8 is shut off with the first bypass pipe 16 and the second bypass pipe 17 side closed.

  The boiling operation is performed by starting the operation of the heat source pump 12 and the HP unit 7 in a state where the three-way valve 11 and the four-way valve 18 are controlled as described above. As a result, the low-temperature water flowing out from the lower part of the hot water storage tank 8 is guided to the HP unit 7 via the HP outgoing pipe 14. And the low temperature water which flowed into HP unit 7 is heated in the heat exchanger for boiling, and becomes high temperature water. The heated high-temperature water passes through the HP return pipe 15, the four-way valve 18, the first hot water supply pipe 13, the three-way valve 11, the second hot water supply pipe 19, and the first hot water supply pipe 21, and the upper part of the hot water storage tank 8. From and into the hot water storage tank 8. By performing such boiling operation, high temperature water is stored from the upper layer inside the hot water storage tank 8, and this high temperature water layer gradually becomes thicker.

  In hot water supply system 1 of the first embodiment, a waste heat recovery operation for recovering waste heat from hot water in bathtub 30 is performed. FIG. 4 is a circuit configuration diagram at the time of waste heat recovery operation in the hot water supply system 1 of the first embodiment. The waste heat recovery operation referred to here is an operation for recovering, in the hot water storage tank 8, waste heat of bath water remaining in the bathtub 30 after bathing. For example, water of about 5 ° C. to 20 ° C. flows from the water supply pipe 9 into the lower part of the hot water storage tank 8. The temperature of the bath water after the user finishes bathing is, for example, about 30 ° C. to 40 ° C. By performing the waste heat recovery operation, the low temperature water in the lower part of the hot water storage tank 8 can be heated by the waste heat of the bath water after completion of bathing and returned to the hot water storage tank 8. By performing the waste heat recovery operation, it becomes possible to reuse the waste heat of the bath water remaining in the bathtub 30 after bathing, so that an energy saving effect is obtained.

  The waste heat recovery operation is executed when the user inputs an operation start instruction by operating the remote controller 44. During the waste heat recovery operation, the three-way valve 11 is controlled so that the b port and the c port communicate with each other and the a port is closed. As a result, the first hot water supply pipe 13 and the hot water introduction pipe 20a communicate with each other, and the flow path to the hot water storage tank 8 is blocked by closing the second hot water supply pipe 19 side. In the waste heat recovery operation, the four-way valve 18 is controlled so that the b port and the d port communicate with each other and the a port and the c port are closed. As a result, the second bypass pipe 17 and the first hot water supply pipe 13 communicate with each other, the HP return pipe 15 and the first bypass pipe 16 are closed, and the flow path to the lower part of the hot water storage tank 8 and the HP unit 7 is provided. Blocked.

  The waste heat recovery operation is executed by starting the operation of the heat source pump 12 and the bath circulation pump 29 in a state where the three-way valve 11 and the four-way valve 18 are controlled as described above. As a result, the bath water in the bathtub 30 flows through the bath return pipe 28 and is sent to the secondary side of the bath heat exchanger 20. On the other hand, the low-temperature water flowing out from the lower portion of the hot water storage tank 8 is exchanged for heat through the HP forward piping 14, the second bypass piping 17, the four-way valve 18, the first hot water supply piping 13, and the hot water introduction piping 20a. Guided to the primary side of the vessel 20. The low-temperature water that has flowed into the bath heat exchanger 20 receives the heat of the bath water, so that the temperature rises and becomes medium-temperature water of about 30 ° C., for example. The intermediate warm water flows from the bath heat exchanger 20 into the middle of the hot water storage tank 8 via the warm water outlet pipe 20b and is stored.

  In addition, the temperature of the bath water in the bathtub 30 falls because the bath water cooled with the heat exchanger 20 for bath | flow distribute | circulates the forward piping 27, and returns to the bathtub 30. FIG. The controller 36 may be configured to stop the heat source pump 12 and the bath circulation pump 29 and end the waste heat recovery operation when the temperature of the bath water becomes equal to or lower than the reference temperature.

  Here, when the start instruction of the waste heat recovery operation is input by a user operation, it is assumed that the last bather has completed bathing. When the final bather has completed bathing, it is desirable to quickly perform a bathroom drying operation to prevent mold generation. Therefore, in the system of the present embodiment, when the start of the waste heat recovery operation is instructed, the cooperative operation of the water heater 35 and the bathroom dryer 41 is automatically performed. Hereinafter, the cooperative operation of the present embodiment will be described in more detail along the flowchart.

  FIG. 5 is a flowchart of a routine executed in the hot water supply system of the first embodiment. In step S <b> 1 of the routine shown in FIG. 5, it is determined whether or not an instruction to start the waste heat recovery operation for the water heater 35 has been issued. Specifically, it is determined whether or not an instruction to start the waste heat recovery operation is input from the operation unit 44b of the remote controller 44 by a user operation. As a result, when the determination is not confirmed, the routine is terminated. When the determination is confirmed, the routine proceeds to the next step S2.

  In the next step S2, the waste heat recovery operation is started. In the next step S3, it is determined whether or not the bathroom drying operation by the bathroom dryer 41 is being executed. As a result, when the determination is confirmed, this routine is terminated. When the determination is not confirmed, the routine proceeds to the next step S4. In step S4, the bathroom drying operation by the bathroom dryer 41 is automatically started.

  As described above, according to the hot water supply system of the first embodiment, when the instruction for starting the waste heat recovery operation is issued, when the bathroom drying operation is not being executed, the bathroom drying operation is performed after the waste heat recovery operation is started. Started automatically. Accordingly, since the bathroom drying operation can be automatically started even if the user does not separately input the instruction for starting the bathroom drying operation from the operation unit 44b of the remote controller 44, the bathroom drying with improved user convenience is realized. It becomes possible.

  By the way, the hot water supply system 1 of Embodiment 1 mentioned above may employ | adopt the form deform | transformed as follows.

  In the hot water supply system 1 according to Embodiment 1 described above, the bathroom drying operation is automatically started after the waste heat recovery operation is started. However, the timing of starting the bathroom drying operation is not limited to this, and for example, the bathroom drying operation may be automatically started at the same time as the start of the waste heat recovery operation. The timing for starting the bathroom drying operation is not limited to immediately after the start of the waste heat recovery operation, but may be a control in which the bathroom drying operation is automatically started after the bathroom drying operation is completed.

  A user operation that receives an instruction to start the waste heat recovery operation is not limited to an input to the operation unit 44 b of the remote controller 44. That is, for example, the remote controller 44 may be equipped with a voice recognition function so that an instruction to start the waste heat recovery operation is received from the user's voice.

  The controller 36 does not have to be built in the water heater 35. The control unit 42 may not be built in the bathroom dryer 41. The control unit 36 and the control unit 42 may be configured as a common single control unit. In this case, the single control unit may be built in the hot water heater 35 or may be built in the bathroom dryer 41.

  The hot water supply system 1 may include a notification unit that notifies the user of the operation state of the waste heat recovery operation, the operation state of the bathroom drying operation, or the operation state of any one of these operations. The notification to the user may be a display on the display unit 44a of the remote controller 44 or an audio output from the speaker 44c.

  The hot water supply system 1 according to the first embodiment may further include a selection unit for the user to select whether or not to perform the above-described cooperative operation of the waste heat recovery operation and the bathroom drying operation. As such a means, for example, the user may be configured to select execution / non-execution of the cooperative operation from the operation unit 44b of the remote controller 44.

Embodiment 2. FIG.
Next, a hot water supply system according to Embodiment 2 of the present invention will be described.

  When the bathroom drying operation by the bathroom dryer 41 is being executed by the above-described cooperative operation, an instruction to start the boiling operation may be issued. As described above, the HP unit 7 is operated in the boiling operation. For this reason, it is assumed that the peak power increases when the bathroom drying operation and the boiling operation are performed at the same time. Therefore, in the hot water supply system according to the second embodiment, the cooperative operation of the bathroom drying operation and the boiling operation is performed to restrict these operations from being performed at the same time. Hereinafter, the cooperative operation of the present embodiment will be described in more detail along the flowchart.

  FIG. 6 is a flowchart of a routine executed in the hot water supply system according to the second embodiment. In step S11 of the routine shown in FIG. 6, it is determined whether or not an instruction to start the boiling operation is given to the water heater 35. As a result, if the determination is not confirmed, the routine is terminated. If the determination is confirmed, the routine proceeds to the next step S12.

  In the next step S12, it is determined whether or not the bathroom drying operation by the bathroom dryer 41 is being executed. As a result, if the determination is confirmed, the process proceeds to step S13. If the determination is not confirmed, the process proceeds to step S14. In step S13, the bathroom drying operation by the bathroom dryer 41 is automatically terminated, and the process proceeds to step S14. In step S14, the boiling operation of the water heater 35 is started, and this routine is ended.

  As described above, according to the hot water supply system of the second embodiment, when the instruction to start the boiling operation is issued while the bathroom drying operation is being executed, the bathroom drying operation is automatically ended. Thereby, it is possible to prevent the bathroom drying operation and the boiling operation from being performed at the same time, and to automatically suppress the peak power.

  By the way, it is preferable that the bathroom drying operation and the boiling operation, which consume a large amount of power, be performed in the midnight hours when the electricity bill is cheaper than other time zones. Therefore, the hot water supply system according to the second embodiment may be configured to automatically adjust the operation conditions and operation time of these operations so that these operations are completed in the midnight time zone.

DESCRIPTION OF SYMBOLS 1 Hot water supply system, 7 Heat pump unit (HP unit), 8 Hot water storage tank, 9 Water supply line, 9a 1st water supply pipe, 9b 2nd water supply pipe, 9c 3rd water supply pipe, 11 Three-way valve, 12 Heat source pump, 13 1st Hot water supply pipe, 14 HP outgoing pipe, 15 HP return pipe, 16 First bypass pipe, 17 Second bypass pipe, 18 Four-way valve, 19 Second hot water supply pipe, 20 Bath heat exchanger, 20a Hot water introduction pipe, 20b Hot water outlet piping, 21 First hot water piping, 23 Mixing valve for bath, 25 Second hot water piping, 26 Solenoid valve for bath, 27 Bath piping, 28 Bath return piping, 29 Bath circulation pump, 30 Bathtub, 31 Pressure reducing valve, 33 tank units, 35 water heaters, 36, 42 control units, 40 bathrooms, 41 bathroom dryers, 44 remote control, 44a display unit, 44b operation unit, 44c speaker

Claims (8)

A water heater capable of performing waste heat recovery operation to recover the heat of the bath water in the bathtub into the hot water storage tank;
A bathroom dryer capable of performing a bathroom drying operation to dry the bathroom;
A control unit capable of executing a linked operation for automatically starting the bathroom drying operation after starting the waste heat recovery operation or simultaneously with the start,
A hot water supply system comprising:   The hot water supply system according to claim 1, further comprising means for receiving a user operation for starting the waste heat recovery operation.   The hot water supply system according to claim 1 or 2, wherein the control unit is configured to start the bathroom drying operation after the waste heat recovery operation is completed in the cooperative operation.   The hot water supply system according to any one of claims 1 to 3, wherein the control unit is built in the bathroom dryer or the hot water heater.   The hot water supply system according to any one of claims 1 to 4, further comprising notification means for notifying a user of an operation state of the water heater or an operation state of the bathroom dryer.   The hot water supply system according to any one of claims 1 to 5, further comprising a selection unit that allows a user to select whether or not to perform the cooperative operation. The water heater is configured to be capable of performing a boiling operation of boiling water in the hot water storage tank by heating means,
The said control part is comprised so that it may restrict | limit that the said bathroom drying operation in the said boiling operation and the said cooperation operation is performed at the same period, The any one of Claims 1-6 characterized by the above-mentioned. The hot water supply system according to item.   The control unit is configured to adjust an operation condition and an operation time so that the boiling operation and the bathroom drying operation are completed in a time zone in which an electricity bill is cheaper than other time zones. The hot water supply system according to claim 7.

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