JPH09210464A - Device and method for controlling boiling of hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with exchange of individual control part by controlling boiling of hot water storage tanks of first and second hot water supply unit corresponding to the connection of the first and second hot water supply units to supply a large volume of hot water since the initial boiling. SOLUTION: A hot water storage type hot water supply unit 1 is provided with hot water storage tanks 5, 6, and the hot water storage tanks 5, 6 are provided with heating bodies 7, 8 and connected to each other in series through a connection pipe 9, and are provided with a control part 10 to control energization to the heating bodies 7, 8. A hot water storage type hot water supply unit 2 is provided with hot water storage tanks 13, 14 inside, the hot water storage tanks 13, 14 are provided with heating bodies 16, 17 respectively and connected to each other in series through a connection pipe 17, and are provided with a control part 18 to control energization to the heating bodies 15, 16. When the hot water storage type hot water supply units 1, 2 are connected in series through a connection pipe 19, the heating bodies 7, 8 of the hot water storage type hot water supply unit 1 closer to a hot water supply port 3 are energized, and the control parts 10, 18 are integratedly controlled by a control operation part 20 so as to boil water in the hot water storage tanks 5, 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling control device and a boiling control method for a water heater in which a plurality of water heater units having a plurality of hot water storage tanks are connected in series or in parallel.

[0002]

2. Description of the Related Art FIG. 5 is a configuration diagram in which a plurality of conventional hot water storage tanks are connected in series and a built-in hot water storage type water heater unit is connected in series. FIG. 6 is a state diagram of the hot water storage type water heater unit in the early stage of boiling.

In FIGS. 5 and 6, 1 is a hot water storage type water heater unit A, 2 is a hot water storage type water heater unit B, 3 is a hot water supply port A, 4 is a water supply port A, 5 is a hot water storage tank A, and 6 is a hot water storage tank. B and 7 are heating elements A, 8 is heating element B, 9 is connecting pipe A, 1
0 is the control unit A, 11 is the hot water supply port B, 12 is the water supply port B, 13
Is a hot water storage tank C, 14 is a hot water storage tank D, 15 is a heating element C, 16 is a heating element D, 17 is a connecting pipe B, 18 is a control unit B, and 19 is a connecting pipe A.

The hot water storage type hot water unit A: 1 is provided with a hot water supply port A: 3 and a water supply port A: 4, and the hot water storage type water heater unit B: 2 is provided with a hot water supply port B: 11 and a water supply port B. : 12 are provided and the hot water storage type water heater unit A:
1 and the hot water storage type water heater unit B: 2 are connected in series by a connection pipe A: 19.

The hot water storage type water heater unit A: 1 has a built-in hot water storage tank A: 5 and hot water storage tank B: 6. The hot water storage tank A: 5 has a heating element A: 7 and the hot water storage tank B: 6 has a hot water storage tank B: 6. A heating element B: 8 is attached, and the hot water storage tank A: 5 and the hot water storage tank B: 6 are connected in series by a connecting pipe A: 9. Further, the hot water storage type water heater unit A: 1 has a heating element A: 7 and a control section A: 10 for controlling energization to the heating element B: 8.

On the other hand, the hot water storage type water heater unit B: 2 also has a built-in hot water storage tank C: 13 and hot water storage tank D: 14,
A heating element C: 15 is attached to the hot water storage tank C: 13, a heating element D: 16 is attached to the hot water storage tank D: 14, and the hot water storage tank C: 13 and the hot water storage tank D: 14 are connected in series by a connecting pipe B: 17. It is connected to the. The hot-water storage water heater unit B: 2 has a heating element C: 15 and a control section B: 18 for controlling the energization of the heating element D: 16.

The hot water storage water heater unit A: 1 is heated by heating the heating element A: 7 to heat the hot water storage tank A: 5 to a predetermined temperature, and then heating the heating element B: 8 to turn on the hot water. Boil tank B: 6 to a predetermined temperature. In the same way, the heating element C: 15 is used for boiling the hot water storage water heater unit B: 2.
Is energized to boil the hot water storage tank C: 13 to a predetermined temperature, and then the heating element D: 16 is energized to hot water storage tank D:
Boil 14 to the desired temperature.

FIG. 6 is a state diagram of the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2 in the initial boiling stage. Each hot water storage water heater unit A: 1 and hot water storage water heater unit B: In 2, the hot water storage tank A: 5 and the hot water storage tank C: 13 are boiled up. Therefore,
In the initial boiling stage of the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2, hot water storage tank A: 5 is hot water, hot water storage tank C: 6 is water, and hot water storage tank C: 13 is hot water.・ Hot water storage tank D: 14 becomes water.

[0009]

The conventional hot water storage type hot water heater is controlled to individually boil the water. First, the hot water storage tank is boiled from the hot water storage tank close to the hot water supply port of the hot water storage water heater. Therefore, when the individual hot water storage water heaters are connected in series, there is a problem that a large amount of hot water cannot be immediately collected because the hot water storage tanks alternate between the hot water tanks and the hot water tanks during the initial boiling. Further, there is also a problem that in order to control the boiling of each hot water storage tank, the control unit of each hot water storage water heater unit must be replaced by connecting the individual hot water storage water heater unit.

The hot water storage type hot water heater of the present invention is made to solve the above-mentioned problems, and the boiling water of each hot water storage tank is raised according to the connection method of each hot water storage type hot water heater unit. By controlling, the large amount of hot water can be collected from the initial boiling time, and it is not necessary to replace the control part of each hot water storage water heater unit, and the boiling setting of each hot water storage tank is easy. The purpose is to be.

The first aspect of the present invention is capable of accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage water heater unit, and the boiling water of each hot water storage tank is raised. It is an object of the present invention to obtain a boiling control device for a water heater that can be appropriately and easily set.

A second aspect of the invention is capable of more accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage type water heater unit, and the boiling water of each hot water storage tank is changed. It is an object of the present invention to obtain a boiling control device for a water heater, which can appropriately and easily perform the raising setting.

A third aspect of the invention is capable of more accurately collecting a large amount of hot water from the time of initial boiling, and it is not necessary to replace the control unit of the hot water storage water heater unit, and the boiling water of each hot water storage tank is changed. It is an object of the present invention to obtain a boiling control device for a water heater, which can appropriately and easily perform the raising setting.

A fourth aspect of the present invention is capable of accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage water heater unit, and the boiling water of each hot water storage tank is raised. An object of the present invention is to obtain a boiling control device for a water heater, which enables more appropriate and easy setting.

A fifth aspect of the invention is capable of accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage type water heater unit, and the boiling water of each hot water storage tank is raised. It is an object of the present invention to provide a boiling control device for a water heater, which enables more appropriate and easy setting.

A sixth aspect of the invention is capable of accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage water heater unit, and the boiling water of each hot water storage tank is raised. An object of the present invention is to obtain a boiling control device for a water heater, which enables more appropriate and easy setting.

A seventh aspect of the invention is capable of accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage type water heater unit, and the boiling water of each hot water storage tank is raised. It is an object of the present invention to obtain a boiling control method for a water heater that can be set appropriately and easily.

An eighth aspect of the invention is capable of more accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage water heater unit, and the boiling water of each hot water storage tank is changed. It is an object of the present invention to obtain a boiling control method for a water heater, which can appropriately and easily set the temperature.

A ninth aspect of the present invention is capable of more accurately collecting a large amount of hot water from the time of initial boiling, and there is no need to replace the control unit of the hot water storage type water heater unit, and the boiling water of each hot water storage tank is changed. It is an object of the present invention to obtain a boiling control method for a water heater, which can appropriately and easily set the temperature.

[0020]

Means for Solving the Problems In the first invention,
A first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series, and a second water heater unit having at least one hot water storage tank provided with a heating element
A water heater unit for connecting the first and second water heater units, the first and second hot water corresponding to how to connect the first and second water heater units. It controls the boiling of the hot water tank of the water heater unit.

In the second invention, a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a plurality of heating elements provided with each heating element and connected in series with each other. A second water heater unit having a hot water storage tank for connecting the first and second water heater units, wherein the first and second water heater units are connected in correspondence with the first and second water heater units. 1
And, the boiling of the hot water storage tank of the second water heater unit is controlled.

In the third invention, a plurality of hot water storage tanks are built-in, and each hot water storage tank is provided with a heating element,
When the hot water storage tank is provided with a plurality of hot water storage water heater units connected in series, and when the hot water storage water heater unit is connected, all hot water storages connected corresponding to the connection method of the hot water storage water heater unit The boiling of the tank can be controlled.

In the fourth aspect of the present invention, a control operation unit for integrally controlling the control units of the respective water heater units for controlling the boiling of the hot water storage tank of each water heater unit is provided.

In the fifth aspect of the invention, a manual operation mode capable of controlling the boiling of each hot water storage tank is provided in the control operation section capable of operating the boiling control of all the connected hot water storage tanks.

In the sixth aspect of the present invention, the control operation section capable of operating the boiling control of all the connected hot water storage tanks is provided with an automatic operation mode for boiling the water heater alone.

In the seventh invention, a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a first water heater unit having at least one hot water storage tank provided with a heating element are provided. A second water heater unit and connecting the first and second water heater units, in the case where the first water heater unit and the second water heater unit are connected in series, The plurality of hot water storage tanks of the first water heater unit connected closer to the hot water supply port than the second water heater unit are preferentially boiled, and the first water heater unit and the second water heater unit When and are connected in parallel, the water is heated from the hot water storage tank of each water heater unit, which is close to the hot water inlet of each water heater unit.

In the eighth invention, a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a plurality of heating elements provided with each heating element and connected in series with each other are provided. A second water heater unit having a hot water storage tank, wherein the first and second water heater units are connected, wherein the first water heater unit and the second water heater unit are connected in series. In this case, the plurality of hot water storage tanks of the first water heater unit connected closer to the hot water supply port than the second water heater unit are preferentially boiled, and the first water heater unit and the first water heater unit are connected to each other. When the two water heater units are connected in parallel, the hot water storage tanks of the respective water heater units are boiled up from the hot water storage tanks close to the hot water inlet of each water heater unit. Than it is.

In the ninth invention, a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a plurality of heating water elements provided with each heating element and connected in series with each other are provided. A second water heater unit having a hot water storage tank and a control operation unit for controlling the first and second water heater units are provided, and the first and second water heater units are connected to each other. In a water heater unit controlled by the control operation unit, when the first water heater unit and the second water heater unit are connected in series, the water heater unit is closer to the hot water inlet than the second water heater unit. The plurality of hot water storage tanks of the connected first water heater unit are preferentially boiled by the manual mode of the control operation unit, and the first water heater unit and the first water heater unit When connected in parallel with the water heater unit of the above, it was made to boil from the hot water storage tank of each water heater unit near the hot water inlet of each water heater unit by the automatic operation mode of the control operation unit. It is a thing.

The embodiment of the present invention has the following concrete means. [Means 1] In the present invention, the boiling of each hot water storage tank of each hot water storage water heater unit can be controlled by the connection method of each hot water storage water heater unit. [Means 2] Further, a control operation unit for integrally controlling the control units of the individual hot water storage water heater units for controlling the boiling of the individual hot water storage tanks is provided. [Means 3] Further, the control operation section is provided with a manual operation mode capable of controlling the boiling of each hot water storage tank. [Means 4] Further, the control operation unit is provided with an automatic operation mode for boiling up each individual hot water storage type water heater.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4, in FIGS.
The same reference numerals as in FIG.

In FIGS. 1 and 2, 1 is a hot water storage type water heater unit A, 2 is a hot water storage type water heater unit B, 3 is a hot water supply port A, 4 is a water supply port A, 5 is a hot water storage tank A, and 6 is a hot water storage tank. B, 7 are heating elements A, 8 are heating elements B, 9 are connecting pipes A, 10
Is a control unit A, 11 is a hot water supply port B, 12 is a hot water supply port B, 13 is a hot water storage tank C, 14 is a hot water storage tank D, 15 is a heating element C,
16 is a heating element D, 17 is a connecting pipe B, 18 is a control unit B, 1
Reference numeral 9 is a connecting pipe A, and 20 is a control operation unit.

The hot water storage type water heater unit A: 1 is provided with a hot water supply port A: 3 and a water supply port A: 4, and the hot water storage type water heater unit B: 2 is provided with a hot water supply port B: 11 and a water supply port B. : 12 are provided and the hot water storage type water heater unit A:
1 and the hot water storage type water heater unit B: 2 are connected in series by a connecting pipe A: 19.

The hot water storage type water heater unit A: 1 has a built-in hot water storage tank A: 5 and hot water storage tank B: 6. The hot water storage tank A: 5 has a heating element A: 7 and the hot water storage tank B: 6 has a hot water storage tank B: 6. A heating element B: 8 is attached, and the hot water storage tank A: 5 and the hot water storage tank B: 6 are connected in series by a connecting pipe A: 9. Further, the hot water storage type water heater unit A: 1 has a heating element A: 7 and a control section A: 10 for controlling energization to the heating element B: 8.

On the other hand, the hot water storage water heater unit B: 2 also has a built-in hot water storage tank C: 13 and hot water storage tank D: 14,
A heating element C: 15 is attached to the hot water storage tank C: 13, a heating element D: 16 is attached to the hot water storage tank D: 14, and the hot water storage tank C: 13 and the hot water storage tank D: 14 are connected in series by a connecting pipe B: 17. It is connected to the. The hot-water storage water heater unit B: 2 has a heating element C: 15 and a control section B: 18 for controlling the energization of the heating element D: 16. Reference numeral 20 denotes a control operation unit that integrally controls the control unit A: 10 and the control unit B: 18.

In FIGS. 3 and 4, 1 is a hot water storage type water heater unit A, 2 is a hot water storage type water heater unit B, 3 is a hot water supply port A, 4 is a water supply port A, 5 is a hot water storage tank A, and 6 is a hot water storage tank. B, 7 are heating elements A, 8 are heating elements B, 9 are connecting pipes A, 10
Is a control unit A, 11 is a hot water supply port B, 12 is a hot water supply port B, 13 is a hot water storage tank C, 14 is a hot water storage tank D, 15 is a heating element C,
16 is a heating element D, 17 is a connecting pipe B, 18 is a control unit B, 2
Reference numeral 0 is a control operation unit, and 21 is a connecting pipe B.

The hot water storage type water heater unit A: 1 is provided with a hot water supply port A: 3 and a water supply port A: 4, and the hot water storage type water heater unit B: 2 is provided with a hot water supply port B: 11 and a water supply port B. : 12 are provided and the hot water storage type water heater unit A:
1 and the hot water storage water heater unit B: 2 are connected in parallel by a connection pipe A: 21.

The hot water storage type hot water unit A: 1 has a built-in hot water storage tank A: 5 and hot water storage tank B: 6. The hot water storage tank A: 5 has a heating element A: 7 and the hot water storage tank B: 6 has a hot water storage tank B: 6. A heating element B: 8 is attached, and the hot water storage tank A: 5 and the hot water storage tank B: 6 are connected in series by a connecting pipe A: 9. Further, the hot water storage type water heater unit A: 1 has a heating element A: 7 and a control section A: 10 for controlling energization to the heating element B: 8.

On the other hand, the hot water storage type water heater unit B: 2 also has a built-in hot water storage tank C: 13 and hot water storage tank D: 14,
A heating element C: 15 is attached to the hot water storage tank C: 13, a heating element D: 16 is attached to the hot water storage tank D: 14, and the hot water storage tank C: 13 and the hot water storage tank D: 14 are connected in series by a connecting pipe B: 17. It is connected to the. The hot-water storage water heater unit B: 2 has a heating element C: 15 and a control section B: 18 for controlling the energization of the heating element D: 16. Reference numeral 20 denotes a control operation unit that integrally controls the control unit A: 10 and the control unit B: 18.

1 and 2 show a hot water storage type water heater unit A: 1
And the hot water storage type water heater unit B: 2 are connected in series. 3 and 4 show a case where the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2 are connected in parallel, and are connected by a connection pipe B: 21.

Control unit A of each hot water storage type water heater unit:
A control operation unit 20 that integrally controls 10 and the control unit B: 18 is provided. For the boiling control function of the individual hot water storage tanks of the control units A: 10 and B: 18 of the individual hot water storage water heater units, the control operation unit 20 is controlled by the control units A: 10 and B:
By connecting with 18, the control operation unit 20 is integrated as a boiling control function. In this way, the boiling control function of the control operation unit 20 is exerted in an integrated manner including the boiling control function of the control units A: 10 and B: 18 of the hot water storage water heater unit, and the integrated boiling control is performed. Function can be realized.
The control operation unit 20 is provided with a manual operation mode for controlling the boiling of each hot water storage tank and an automatic operation mode for boiling the hot water storage water heater unit alone.

In this embodiment, when the connecting pipe A: 19 is connected in series as shown in FIGS. 1 and 2, the heating element A: 7 and the heating element B: 8 are energized and the hot water storage tank A: 5. Also, it can be set by the manual operation mode of the control operation unit 20 such that it is boiled from the hot water storage tank B: 6.

More specifically, it is as follows.
As shown in FIGS. 1 and 2, when the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2 are connected in series by the connection pipe A: 19, the hot water storage port is close to the hot water supply port A: 3. Hot water storage unit A: 1 hot water storage tank A: 5 and hot water storage tank B: 6
The control operation unit 20 controls so that the heating elements A: 7 and the heating elements B: 8 provided in the above are energized and boiled from the hot water storage tank A: 5 and the hot water storage tank B: 6. This boiling control is set by the manual operation mode in the control operation unit 20.

FIG. 2 is a state diagram in the early stage of boiling when the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2 are connected in series. The hot water storage water heater unit A: 1 is shown in FIG.
In, hot water storage tank A: 5 and hot water storage tank B: 6 are boiled up. Therefore, in the initial boiling stage of the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2, the hot water storage tank A: 5 is "hot water", the hot water storage tank C: 6 is "hot water", and the hot water storage is The tank C: 13 becomes "water" and the hot water storage tank D: 14 becomes "water". In the initial stage of boiling, the hot water in the hot water storage tank A: 5 and the hot water storage tank C: 6 are supplied through the hot water supply port 3.

Further, as shown in FIGS. 3 and 4, the connecting pipe B: 21
In the case of parallel connection, the heating element A: 7 and the heating element C: 15 are energized to be boiled from the hot water storage tank A: 5 and the hot water storage tank C: 13 by the automatic operation mode of the control operation unit 20. Since it can be set to perform boiling for a single hot water storage type water heater unit, a large amount of hot water can be collected even during initial boiling depending on how each hot water storage type water heater is connected.

More specifically, it is as follows.
As shown in FIGS. 3 and 4, when the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2 are connected in parallel with each other through the connection pipe B: 21, the hot water storage water heater unit is connected. A: 1 and a heating element A: 7 and a heating element C: 15 provided in a hot water storage tank A: 5 and a hot water storage tank C: 13 respectively provided in the hot water storage type water heater unit B: 2
To the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2, the hot water storage tank A: 5 and the hot water storage tank C:
The boiling is controlled by the control operation unit 20 so as to boil from 13.

FIG. 4 is a state diagram in the initial boiling stage when the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2 are connected in parallel. The hot water storage water heater unit A:
In 1 and the hot water storage type water heater unit B: 2, the hot water storage tank A: 5 and the hot water storage tank C: 13 are boiled up. Therefore, in the initial boiling stage of the hot water storage water heater unit A: 1 and the hot water storage water heater unit B: 2, the hot water storage tank A: 5 is "hot water", the hot water storage tank C: 6 is "water", and the hot water storage is The tank C: 13 is in "hot water" and the hot water storage tank D: 14 is in "water". In the initial stage of boiling, the hot water storage tank A: 5 and the hot water storage tank C: 1
3 hot water is supplied through the hot water supply port 3 and the hot water supply port 11.

This boiling control can be set so as to perform boiling in the case of a single hot water storage water heater unit by the automatic operation mode of the control operation unit 20, so that it corresponds to the connection method of individual hot water storage water heaters. As a result, a large amount of hot water can be collected during the initial boiling.

Further, since the boiling of each hot water storage tank can be controlled by the control operation unit 20, it is not necessary to replace the control unit 10 and the control unit 18 of each hot water storage water heater.

According to the embodiment of the present invention, since it is possible to control the boiling of each hot water storage tank corresponding to the connection method of each hot water storage type hot water heater unit, a large amount of hot water is collected from the initial boiling time. I can make hot water.

Further, according to the embodiment of the present invention, since the control operation unit for integrally controlling the control units of the individual hot water storage water heater units is provided, the control units of the individual hot water storage water heater units are provided. The boiling of individual hot water storage tanks can be controlled without replacement.

Further, according to the embodiment of the present invention, since the control operation section is provided with the manual operation mode and the automatic operation mode, it is easy to set the boiling of each hot water storage tank.

[Brief description of drawings]

FIG. 1 is a configuration diagram of series connection of hot water storage water heaters showing an embodiment of the present invention.

FIG. 2 is a diagram showing an initial boiling state of hot water storage hot water units connected in series according to the embodiment of the present invention.

FIG. 3 is a parallel connection configuration diagram of hot water storage water heaters showing an embodiment of the present invention.

FIG. 4 is an initial boiling state diagram of hot water storage type hot water heaters connected in parallel according to the embodiment of the present invention.

FIG. 5 is a series connection configuration diagram showing a conventional hot water storage type water heater.

FIG. 6 is an initial boiling state diagram of a conventional hot water storage type hot water heater connected in series.

[Explanation of symbols]

1 hot water storage type water heater unit A, 2 hot water storage type water heater unit B, 3 hot water supply port A, 4 water supply port A, 5 hot water storage tank A, 6 hot water storage tank B, 7 heating element A, 8 heating element B,
9 Connection pipe A, 10 Control part A, 11 Hot water supply port B, 12
Water inlet B, 13 hot water storage tank C, 14 hot water storage tank D,
15 heating element C, 16 heating element D, 17 connecting pipe B, 18
Control unit B, 19 Connection pipe A, 20 Control operation unit, 21
Connection tube B.

Claims (9)

[Claims] 1. A first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a second water heater unit having at least one hot water storage tank provided with a heating element. In which the first and second water heater units are connected, the hot water storage of the first and second water heater units corresponding to the connection method of the first and second water heater units. A boiling control device for a water heater, which controls boiling of a tank. 2. A first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series, and a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other. And a second water heater unit for connecting the first and second water heater units, the first and second water heater units corresponding to how to connect the first and second water heater units. A boiling control device for a water heater, which controls the boiling of a hot water storage tank of the water heater unit. 3. A hot water storage unit comprising a plurality of hot water storage tanks, a heating element provided for each hot water storage tank, and a plurality of hot water storage water heater units in which the hot water storage tanks are connected in series. When the above is connected, it is possible to control the boiling of all the hot water storage tanks connected according to the connection method of the hot water storage water heater unit. 4. The control operation unit for integrally controlling the control units of the respective water heater units for controlling the boiling of the hot water storage tanks of the individual water heater units is provided. 3. The boiling control device for a water heater according to any one of 3 above. 5. The control operation unit capable of operating the boiling control of all the connected hot water storage tanks is provided with a manual operation mode capable of controlling the boiling of each hot water storage tank. Boiling water heater control device. 6. The automatic operation mode for performing boiling when the water heater unit alone is provided in a control operation section capable of operating boiling control of all the hot water storage tanks connected thereto. A boiling control device for the electric water heater described. 7. A first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a second water heater unit having at least one hot water storage tank provided with a heating element. And connecting the first and second water heater units, in the case where the first water heater unit and the second water heater unit are connected in series, a second water heater unit A plurality of hot water storage tanks of the first water heater unit which are connected closer to the hot water supply port than the hot water supply port are preferentially boiled, and the first water heater unit and the second water heater unit are connected in parallel. In this case, the boiling control method for the water heater is characterized in that the water is heated from the hot water storage tank of each water heater unit near the hot water supply port of each water heater unit. . 8. A first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other. A second water heater unit and connecting the first and second water heater units, in the case where the first water heater unit and the second water heater unit are connected in series, The plurality of hot water storage tanks of the first water heater unit connected closer to the hot water supply port than the second water heater unit are preferentially boiled, and the first water heater unit and the second water heater unit When the and are connected in parallel, the water heater is characterized in that it is boiled from the hot water storage tank of each water heater unit, which is close to the hot water inlet of each water heater unit. Boiling control method. 9. A first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other, and a first water heater unit having a plurality of hot water storage tanks each provided with a heating element and connected in series with each other. Two water heater units and a control operation part for controlling the first and second water heater units are provided, the first and second water heater units are connected, and these water heater units are connected to each other. In the case of controlling by the control operation unit, when the first water heater unit and the second water heater unit are connected in series, the first water heater unit connected closer to the hot water supply port than the second water heater unit A plurality of hot water storage tanks of the water heater unit are preferentially boiled by a manual mode of the control operation unit, and the first water heater unit and the second water heater unit
When connected in parallel with the water heater unit of the above, it was made to boil from the hot water storage tank of each water heater unit near the hot water inlet of each water heater unit by the automatic operation mode of the control operation unit. A boiling control method for a water heater characterized by the following.