JP2015222152A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability in installation work while suppressing increase of costs when a storage type water heater is connected to a system such as HEMS.SOLUTION: A storage type water heater 35 includes a HP unit 7, a hot water storage tank 8, a control device 36, a kitchen remote controller 44A, a bathroom remote controller 44B, and the like. The water heater 35 is connected to a HEMS controller 46 including a HEMS operation terminal 47. In a case when a boiling-up relative operation can be implemented by the HEMS operation terminal 47 besides the kitchen remote controller 44A, the control device 36 permits a boiling-up operation even when the kitchen remote controller 44A is in a non-connection state with the control device 36. Further the boiling-up operation is forbidden in a case when both of the kitchen remote controller 44A and the HEMS operation terminal 47 are in a non-connection state with the control device 36.

Description

  The present invention relates to a hot water storage type hot water heater having a function of storing hot water and supplying hot water.

  As a conventional technique, for example, as described in Patent Document 1, hot water heated (boiling) by a heating device such as a heat pump is stored in a hot water storage tank, and the hot water taken out from the hot water storage tank is stored in a bathtub, shower, faucet, etc. There are known hot-water storage water heaters that supply hot water supply objects. In the prior art, remote controllers are generally installed in the bathroom and the kitchen, respectively, and hot water supply temperature, boiling temperature, etc. are set with these remote controllers, and operations such as hot water filling and chasing are generally performed.

  Further, in the conventional technology, a hot water storage type hot water heater is connected to a system called HEMS (Home Energy Management System). HEMS controls various electric devices arranged in a house, and comprehensively manages energy supply and demand of the entire electric device. The HEMS includes an operation terminal for operating the system.

JP2013-178209A

  However, when the hot water storage type hot water heater is connected to the HEMS as in the prior art, not only two operation terminals including a bathroom and a kitchen remote control but also an operation terminal for HEMS is required. For this reason, in the prior art, if it is going to implement | achieve HEMS containing a water heater, it will be necessary to purchase these several operation terminals, and there exists a problem that the cost of a system increases. In addition, when installing the system, it is necessary to install the operation terminal, connect to the system, and perform initial settings for each operation terminal.

  The present invention has been made to solve the above-described problems, and in the case of connecting to a system such as a HEMS, the hot water storage type capable of suppressing an increase in cost and improving workability during installation work. The purpose is to provide a water heater.

  A hot water storage type water heater according to the present invention includes a hot water storage tank that stores hot water, a heating device that heats hot water to be stored in the hot water storage tank, and a boiling device that drives the heating device to store hot water in the hot water storage tank. A control device that performs operation, a remote controller that can perform boiling-related operations to change the execution state of boiling operation, and a part of a system that controls multiple electrical devices that perform boiling-related operations When a possible HEMS operation terminal is connected to the control device, the boiling operation is permitted even if the remote control is not connected to the control device, and the remote control and the HEMS operation terminal are not connected to the control device. And a boiling permission / prohibition setting means for prohibiting the boiling operation.

  According to the present invention, when the HEMS operation terminal capable of performing the boiling-related operation is connected to the control device, the boiling operation can be permitted even if the remote control is not connected to the control device. it can. Thus, for example, a system can be configured without using a remote controller. Therefore, when connecting the hot water storage type hot water heater to a system such as HEMS, the system can be simplified and cost reduction can be promoted. Moreover, the workability | operativity at the time of installation work can be improved.

It is a block diagram which shows the hot water storage type hot water supply device by Embodiment 1 of this invention. 5 is a flowchart illustrating an example of control executed by a control device in Embodiment 1 of the present invention. In Embodiment 2 of this invention, it is a flowchart which shows an example of the control performed by the control apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted. In addition, the present invention includes all combinations of configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. As shown in the figure, the water heater 35 of the present embodiment includes a tank unit 33, an HP (heat pump) unit 7 that uses a heat pump cycle, and remote controllers 44A and 44B described later. The HP unit 7 and the tank unit 33 are connected to each other via an HP outgoing pipe 14 and an HP return pipe 15. A control device 36 is mounted on the tank unit 33. The operations of various valves, pumps and the like provided in the tank unit 33 and the HP unit 7 are controlled by a control device 36 electrically connected thereto.

  The HP unit 7 constitutes a heating device that heats hot water to be stored in a hot water storage tank 8 described later. The HP unit 7 includes devices such as the compressor 1, the water refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6, and a refrigerant pipe 5 that connects these devices in a ring shape. The water-refrigerant heat exchanger 3 exchanges heat between the high-temperature and high-pressure refrigerant compressed by the compressor 1 and the low-temperature water introduced from the hot water storage tank 8.

  The tank unit 33 is equipped with a hot water storage tank 8 for storing hot water, and various components and piping described below. A third water supply pipe 9 c is connected to a water inlet 8 a provided at the lower part of the hot water storage tank 8. Water supplied from a water source such as water supply is adjusted to a predetermined pressure by the pressure reducing valve 31 and then flows into the hot water storage tank 8 through the third water supply pipe 9c. A hot water supply pipe 21 for taking out hot water stored in the hot water storage tank 8 and a hot water supply pipe 13 are connected to the hot water introduction outlet 8 d provided in the upper part of the hot water storage tank 8.

  High temperature water heated using the HP unit 7 flows into the hot water storage tank 8 from the hot water introduction outlet 8d, and low temperature water from the third water supply pipe 9c flows from the water introduction port 8a. Thereby, in the hot water storage tank 8, the temperature stratification in which the high temperature water stays on the upper side and the low temperature water stays on the lower side is formed. A plurality of hot water storage temperature sensors 42 and 43 are attached to the surface of the hot water storage tank 8 at different height positions. The hot water storage temperature sensors 42 and 43 detect the temperature distribution of the hot water in the hot water storage tank 8 so that the remaining hot water amount and the heat storage amount in the hot water storage tank 8 can be calculated. The control device 36 controls the start and stop of the boiling operation, which will be described later, based on the amount of remaining hot water or the amount of stored heat.

  In the tank unit 33, a heat source pump 12, a bath heat exchanger 20, and a bath circulation pump 29 are provided. The heat source pump 12 is a pump for circulating hot water through various pipes in the tank unit 33, and is provided in the HP outgoing pipe 14. The bath heat exchanger 20 heats the bath water by exchanging heat between the hot water supplied from the hot water storage tank 8 or the HP unit 7 and the bath water introduced from the bath 30. The bath heat exchanger 20 is connected with a bath piping 27 and a bath return piping 28 for circulating bath water led out from the bath 30. In the middle of the bath return pipe 28, a bath circulation pump 29 for circulating the bath water, a flow switch 19 for detecting the presence or absence of water flow in the bath return pipe 28, and the temperature of the bath water flowing out of the bath 30 are detected. A return temperature sensor 38 is provided. In the middle of the bath piping 27, a bath temperature sensor 37 for detecting the temperature of the bath water after the heat exchange flowing out from the bath heat exchanger 20 is installed.

  The three-way valve 11 has an a port and a b port that are inflow ports, and a c port that is an outflow port. The three-way valve 11 switches the hot water flow path between the two paths, the ac path and the bc path. The four-way valve 18 has b and c ports that are inflow ports, and a and d ports that are outflow ports. The four-way valve 18 switches the hot water flow path among the four paths ab, ac, bd, and cd. The hot water supply pipe 13 connects the d port of the four-way valve 18 and the hot water introduction outlet 8 d above the hot water storage tank 8. The HP outgoing pipe 14 connects the c port of the three-way valve 11 and the water inlet of the water refrigerant heat exchanger 3. The HP return pipe 15 connects the water outlet of the water refrigerant heat exchanger 3 and the c port of the four-way valve 18.

  The tank unit 33 includes a water outlet port pipe 10, a first bypass pipe 16, a second bypass pipe 17, a hot water introduction pipe 20a, and a hot water outlet pipe 20b. The water outlet port pipe 10 connects a water outlet port 8 b provided at the lower part of the hot water storage tank 8 and the a port of the three-way valve 11. The first bypass pipe 16 connects the a port of the four-way valve 18 and a hot water inlet 8 c provided at the center or lower part of the hot water storage tank 8. The hot water introduction pipe 20 a branches off from the middle of the hot water supply pipe 13 and is connected to 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 b port of the three-way valve 11. The second bypass pipe 17 branches from between the heat source pump 12 in the HP forward 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, a hot water supply mixing valve 22, a bath mixing valve 23, a first hot water supply pipe 24, and a second hot water supply pipe 25. One end side of the first water supply pipe 9a is connected to a water source such as a water supply. A second water supply pipe 9 b and a third water supply pipe 9 c are connected to the other end side of the first water supply pipe 9 a through a pressure reducing valve 31. The first water supply pipe 9 a, the second water supply pipe 9 b and the third water supply pipe 9 c constitute the water supply pipe 9. The second water supply pipe 9b is connected to one of the two inlets of the hot water mixing valve 22 and one of the two inlets of the bath mixing valve 23, respectively. One end side of the hot water supply pipe 21 is connected to the upper part of the hot water storage tank 8, and the other end side of the hot water supply pipe 21 is the other of the two inlets of the hot water mixing valve 22 and the two inlets of the bath mixing valve 23. Are connected to the other of them.

  The mixing valve 22 for hot water supply mixes the high temperature water supplied from the hot water storage tank 8 to the hot water supply pipe 21 and the low temperature water supplied from the second water supply pipe 9b, and makes the mixing ratio of the two variable. This adjusts the temperature of hot water supplied to the hot water. The outlet of the hot water supply mixing valve 22 is connected to one end of the first hot water supply pipe 24. The other end side of the first hot water supply pipe 24 is connected to a hot water tap 34. The hot water whose temperature has been adjusted by the hot water mixing valve 22 passes through the first hot water supply pipe 24, the hot water tap 34, and an external pipe (not shown) connected to the hot water tap 34, and is used for a shower, a currant, and a sink. And a hot water supply target composed of a faucet of a washstand and the like.

  The bath mixing valve 23 mixes high temperature water supplied from the hot water storage tank 8 to the hot water supply pipe 21 and low temperature water supplied from the second water supply pipe 9b, and adjusts the temperature of the hot water supplied to the bathtub. It is. The outlet of the mixing valve 23 for the bath is connected to one end side of the second hot water supply pipe 25. The other end side of the second hot water supply pipe 25 is connected to the back-up pipe 27 between the bottom heat exchanger 20 and the back-up temperature sensor 37. In the middle of the second hot water supply pipe 25, there are provided an electromagnetic valve 26 for opening and closing the second hot water supply pipe 25 and a flow sensor 45 for detecting the flow of hot water passing through the second hot water supply pipe 25. The hot water whose temperature is adjusted by the bath mixing valve 23 flows into the bathtub 30 via the second hot water supply pipe 25, the bath forward pipe 27, and the bath return pipe 28.

  Next, the boiling operation of the water heater 35 will be described. In the boiling operation, the HP unit 7 is driven to store hot water in the hot water storage tank 8. When executing the boiling operation, the control device 36 drives the HP unit 7 and the heat source pump 12, switches the three-way valve 11 to the ac path, and switches the four-way valve 18 to the cd path. Thereby, in boiling operation, low temperature water is taken out from the water outlet 8b of the hot water storage tank 8 to the water outlet port 10. This low temperature water is introduced into the water refrigerant heat exchanger 3 of the HP unit 7 via the three-way valve 11 and the HP outgoing pipe 14, and is heated by the water refrigerant heat exchanger 3 to become high temperature water. Then, the high-temperature water flowing out from the water-refrigerant heat exchanger 3 flows into the hot water introduction outlet 8d of the hot water storage tank 8 through the HP return pipe 15, the four-way valve 18 and the hot water supply pipe 13, and enters the upper part of the hot water storage tank 8. Stored. By such a boiling operation, the amount of stored hot water and the amount of stored heat in the hot water storage tank 8 can be increased.

  Next, the chasing operation of the water heater 35 will be described. The chasing operation is an operation for heating or keeping warm the bathtub water. When executing the follow-up operation, the control device 36 drives the heat source pump 12 and the bath circulation pump 29, switches the three-way valve 11 to the bc path, and switches the four-way valve 18 to the ab path. . Thereby, in the chasing operation, the bathtub water is taken out from the bathtub 30 to the bath return pipe 28, and this bath water is heated while passing through the secondary side of the bath heat exchanger 20. Then, the heated bathtub water is returned to the bathtub 30 via the forward piping 27. On the other hand, when the heat source pump 12 is operated, the high temperature water in the hot water storage tank 8 is taken out from the hot water introduction outlet 8d, and this high temperature water passes through a part of the hot water supply pipe 13 and the hot water introduction pipe 20a. 20 flows into the primary side. The hot water whose temperature has decreased while passing through the bath heat exchanger 20 is a part of the hot water outlet pipe 20b, the three-way valve 11, and the HP outgoing pipe 14 (heat source pump 12), the second bypass pipe 17, and the four-way valve 18. And, it flows into the hot water inlet 8 c of the hot water storage tank 8 via the first bypass pipe 16 and is returned to the hot water storage tank 8.

  Next, the operation system of the water heater 35 will be described. The water heater 35 includes a kitchen remote controller 44A as a first remote controller installed in the kitchen and a bathroom remote controller 44B as a second remote controller installed in the bathroom. In this specification, the kitchen remote controller 44A and the bathroom remote controller 44B may be collectively referred to as remote controllers 44A and 44B. The remote controllers 44A and 44B are equipped with a display unit for displaying the operating state of the water heater 35, an operation unit such as a switch operated by the user, a speaker, a microphone, and the like. The remote controllers 44A and 44B are connected to the control device 36 so that they can communicate with each other. In the present embodiment, the case where the remote controllers 44A and 44B are installed in the kitchen and bathroom is illustrated, but the remote controller of the present invention may be installed in any place in the house.

  The kitchen remote controller 44A has a function of executing an operation for changing the execution state of the boiling operation (hereinafter referred to as a boiling related operation), and a temperature of hot water supplied to each hot water supply target in the house (hot water supply temperature). ) Is set and changed. The bathroom remote control 44 </ b> B has a function of outputting, to the control device 36, a command for causing the control device 36 to execute, for example, filling of the bathtub 30 and chasing.

  Here, a specific example of the boiling-related operation will be described. The boiling-related operation includes an operation for setting various parameters related to the boiling operation, and a boiling command by outputting a boiling command to the control device 36. This means at least one of the operations to be started immediately. The parameters set by the boiling related operation include, for example, the amount of hot water stored in the hot water storage tank 8 stored by the boiling operation, the temperature and amount of stored hot water, the start time, the end time and the duration of the boiling operation, Examples include the heating power during the raising operation, the hot water storage temperature when the boiling operation is automatically executed, the amount of hot water stored, and the conditions relating to the execution time zone.

  The water heater 35 is connected to a HEMS controller 46 installed in the house. The HEMS controller 46 configures a system that controls various electric devices arranged in a house and comprehensively manages energy supply and demand of the entire electric device. This system includes a HEMS operation terminal 47, a power measuring device 48, and the like, in addition to electric devices such as a water heater 35 and an air conditioner 49. The HEMS operation terminal 47 performs, for example, switching of the operation of the HEMS controller 46, setting and changing of various setting values related to the HEMS. The HEMS operation terminal 47 is connected to the control device 36 via the HEMS controller 46 and has a function of executing a boiling-related operation. That is, the boiling related operation executed by the HEMS operation terminal 47 is transmitted to the control device 36 via the HEMS controller 46 and reflected in the control of the boiling operation.

  The water heater 35 according to the present embodiment has a function of permitting and prohibiting the boiling operation according to the connection state of the remote controllers 44A and 44B and the HEMS operation terminal 47. More specifically, the control device 36 includes a HEMS operation terminal 47 having a function equivalent to that of the kitchen remote control 44A even if the kitchen remote control 44A capable of performing boiling-related operations is not connected to the control device 36. If it is connected, the execution of the boiling operation is permitted. Further, the control device 36 prohibits execution of the boiling operation when the remote controllers 44A and 44B and the HEMS operation terminal 47 are not connected to the control device 36. The “function equivalent to the kitchen remote control 44A” means a function for executing the boiling related operation.

  Hereinafter, a specific example of the control will be described with reference to FIG. FIG. 2 is a flowchart showing an example of control executed by the control device in Embodiment 1 of the present invention. In the routine shown in FIG. 2, first, in step S1, it is determined whether or not the kitchen remote controller 44A is connected to the control device. If this determination is true, the kitchen remote controller 44A is in a normal state, and the process proceeds to step S2. In step S2, for example, when a boiling command is output from the kitchen remote controller 44A, the boiling operation is permitted to be executed.

  In step S1, for example, even if the communication signal is continuously output from the control device 36 to the kitchen remote controller 44A, if there is no response from the kitchen remote controller 44A for a certain time (for example, 5 minutes), the kitchen remote controller 44A is disconnected. It is determined that it is in a state. On the other hand, if the determination in step S1 is not established, the process proceeds to step S3.

  Next, in step S3, it is determined whether or not the HEMS operation terminal 47 having the same function as the kitchen remote control 44A is connected to the control device 36. If this determination is established, it is determined that the boiling operation can be performed by performing the boiling-related operation using the HEMS operation terminal 47 even when the kitchen remote controller 44A is not connected. Therefore, in this case, the process proceeds to step S4, and the execution of the boiling operation is permitted. In step S3, for example, by transmitting information on the function of the HEMS operation terminal 47 from the HEMS controller 46 to the control device 36, the determination process in step S3 can be realized.

  On the other hand, if the determination in step S3 is not established, it is determined that the HEMS operation terminal 47 is not connected or that the HEMS operation terminal 47 does not have a function for executing the boiling related operation. In this case, since the boiling-related operation cannot be executed and there is a possibility that the boiling operation may be executed with a setting different from the user's intention, the process proceeds to step S5, and the boiling operation is prohibited. To do.

  As described above in detail, according to the present embodiment, when the HEMS operation terminal 47 capable of performing the boiling-related operation is connected to the control device 36, the kitchen remote controller 44A is not connected to the control device 36. Even if it is, boiling operation can be permitted. Accordingly, the system can be configured without using the kitchen remote controller 44A. For example, the kitchen remote controller 44A can be integrated with the HEMS operation terminal 47, or the kitchen remote controller 44A can be replaced with the HEMS operation terminal 47. . Therefore, in the case where the water heater 35 is connected to a system such as HEMS, the system can be simplified and cost reduction can be promoted. Moreover, the workability | operativity at the time of installation work can be improved.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that in addition to the configuration and control of the first embodiment, the connection state of the bathroom remote controller is also taken into consideration. Specifically, in the control device 36, even if one of the remote controllers 44A and 44B is not connected to the control device 36, the other remote controller and the HEMS operation terminal 47 are connected to the control device 36. In some cases, boiling operation is permitted. Further, when both the remote controllers 44A and 44B are not connected to the control device 36, the boiling operation is prohibited even if the HEMS operation terminal 47 is connected to the control device 36.

  Hereinafter, a specific example of the control will be described with reference to FIG. FIG. 3 is a flowchart showing an example of control executed by the control device in Embodiment 2 of the present invention. The routine shown in this figure is obtained by adding the determination process in step S6 to the routine shown in the first embodiment (FIG. 2).

  More specifically, in the routine shown in FIG. 3, when the determination in step S3 is established, the process proceeds to step S6. In step S6, it is determined whether or not a bathroom remote controller 44B having a function equivalent to that of the kitchen remote controller 44A is connected. Here, the definition of “function equivalent to the kitchen remote control 44A” is as described above. In step S6, for example, the determination process in step S6 can be realized by transmitting information on the function of the bathroom remote control 44B to the control device 36.

  If the determination in step S6 is established, it is determined that the boiling operation can be performed by performing a boiling-related operation using at least one of the bathroom remote controller 44B and the HEMS operation terminal 47. Therefore, in this case, the process proceeds to step S4, and the execution of the boiling operation is permitted. On the other hand, when at least one of the determinations in steps S3 and S6 is not established, the process proceeds to step S5, and the boiling operation is prohibited.

  Here, since the HEMS controller 46 and the HEMS operation terminal 47 are often separate products from the water heater 35, when a failure of these devices, a communication operation failure, or the like occurs, the HEMS operation terminal 47 causes boiling. Raising related operations cannot be executed. Assuming such a situation, in the present embodiment, the reliability of the operation related to the boiling operation is ensured by using the bathroom remote controller 44B.

  According to the present embodiment, the boiling operation can be permitted only when not only the HEMS operation terminal 47 but also the bathroom remote control 44B is connected as a terminal having the same function as the kitchen remote control 44A. That is, for example, even if the HEMS operation terminal 47 stops functioning, the boiling operation can be permitted only when the bathroom remote controller 44B can be used instead, so that the reliability can be improved. .

  In the bathroom remote controller 44B having the same function as that of the kitchen remote controller 44A, when the operation unit and the display unit for executing the boiling-related operation are always present in the bathroom remote controller 44B, the bathroom remote controller 44B is viewed from the user. There is a possibility that the number of operation items becomes excessive, and the operability is degraded. For this reason, in the present embodiment, for example, a touch panel is mounted on the bathroom remote controller 44B, and only when the kitchen remote controller 44A is not connected to the control device 36, an operation unit and a display unit for executing the boiling-related operation. May appear on the touch panel. According to this configuration, even when the function of the bathroom remote controller 44B is equivalent to that of the kitchen remote controller 44A, the operability of the bathroom remote controller 44B can be favorably maintained.

  In the first and second embodiments, FIGS. 2 and 3 show specific examples of the boiling availability setting means. In the first and second embodiments, the HP unit 7 is described as an example of the heating device. However, the present invention may be applied to various heating devices other than the heat pump.

DESCRIPTION OF SYMBOLS 1 Compressor, 3 Water refrigerant heat exchanger, 4 Expansion valve, 5 Refrigerant piping, 6 Air heat exchanger, 7 HP unit (heating apparatus), 8 Hot water storage tank, 8a Water inlet, 8b Water outlet, 8c Hot water introduction Port, 8d hot water introduction outlet, 9 water supply pipe, 9a first water supply pipe, 9b second water supply pipe, 9c third water supply pipe, 10 water outlet pipe, 11 three-way valve, 12 heat source pump, 13 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 flow switch, 20 bath heat exchanger, 20a hot water introduction pipe, 20b hot water outlet pipe, 21 hot water supply pipe, 22 Mixing valve for hot water supply, 23 Mixing valve for bath, 24 1st hot water supply pipe, 25 2nd hot water supply pipe, 26 Solenoid valve for bathing, 27 Bathing piping, 28 Bathing return piping, 29 Bathing circulation Pump, 30 Bathtub, 31 Pressure reducing valve, 33 Tank unit, 34 Hot water tap, 35 Hot water storage type hot water heater, 36 Control device, 37 Bath temperature sensor, 38 Bath return temperature sensor, 42, 43 Hot water temperature sensor, 44A Kitchen remote control ( 1st remote control), 44B Bath remote control (2nd remote control), 45 bath flow sensor, 46 HEMS controller, 47 HEMS operation terminal

Claims (3)

A hot water storage tank for storing hot water;
A heating device for heating hot water to be stored in the hot water storage tank;
A controller for driving the heating device to perform a boiling operation for storing hot water in the hot water storage tank;
A remote control capable of performing a boiling-related operation for changing the execution state of the boiling operation;
When a HEMS operation terminal that is a part of a system that controls a plurality of electrical devices and is capable of performing the boiling-related operation is connected to the control device, the remote control is not connected to the control device. Even if the boiling operation is permitted, and the remote controller and the HEMS operation terminal are not connected to the control device, the boiling propriety setting means for prohibiting the boiling operation;
Hot water storage water heater equipped with. The remote controllers are two remote controllers that can execute the boiling-related operations.
The boiling permission / inhibition setting means is configured such that, even if one of the two remote controls is not connected to the control device, the other remote control and the HEMS operation terminal are connected to the control device. When boiling operation is permitted and the two remote controllers are not connected to the control device, the boiling operation is prohibited even if the HEMS operation terminal is connected to the control device. The hot water storage type water heater according to claim 1.   The hot water storage according to claim 2, wherein an operation unit and a display unit for performing the boiling-related operation appear on the other remote controller only when the one remote controller is not connected to the control device. Type water heater.

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