JPS6315033A - Hot water supplier with additional burning apparatus - Google Patents

Abstract

PURPOSE:To lower the cost for an automatic hot water supply function and to freely install the supplier by actuating a proportional control valve to control the quantity of a hot water supply burner based on signals from a hot water supply thermistor and opening a solenoid valve for additional burning when the signal from the hot water supplying exceeds the supply hot water capability, thereby causing a burner for additional burning to automatically supply hot water to the bathtub. CONSTITUTION:At the time of an automatic hot water supplying operation, a hot water supply control valve 24 is opened and water is through a hot water supply heat exchanger 1, and a proportional control valve 13 is actuated based on a signal from a thermistor 3 for supplying hot water, and the quantity of combustion of a hot water supply burner 14 is controlled to stably control the temperature of hot water to supply hot water automatically to a bathtub 4. In a case where the temperature of water is low in winter season or the like, when the hot water supply capability is exceeded and the signal from the hot water supplying thermistor 18 becomes lower than that equivalent to the automatic supply hot water set temperature, a pump 3 is operated, the passage of water is detected by a circulating water detection element 19, and an additional burning solenoid valve 15 is opened and an additional burning burner 16 is operated simultaneously. Thus, the temperature of hot water within the bathtub is raised to a desired bath heating temperature in a short period of time with a large capability thereby to automatically supply hot water.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a water heater with a reheating function that automatically supplies hot water to a bathtub.

Conventional technology In recent years, water heaters with reheating function have been developed as composite products that connect the water heater and bathtub, and combine the reheating device that circulates hot water with a pump. The automation of baths is progressing, including additions.

A conventional water heater with a reheating function will be described below with reference to the drawings.

FIG. 2 shows a schematic diagram of the configuration of the conventional example.

In the figure, (1) is a heat exchanger for hot water supply, which is connected to water supply ports 1a and tb. (2) is a rear-end collision heat exchanger, and a pump (3) is installed in the hot water passage leading from the hot water return port 2a connected to the hot water return port 2a and the hot water inlet 2b to the rear-end collision heat exchanger (2), and A bathtub (4) is connected to the hot water return port 2a and the hot water spout 2b via a connecting pipe (5) to form a hot water circulation passage. An exhaust pipe (6) is connected to each heat exchanger (11, +21), and the combustion exhaust gas is discharged to an exhaust port (8) by an exhaust fan (7).

It is also formed in a part of the case so that combustion air can be supplied from the air supply port (9).

The fuel passage branches from the original solenoid valve αυ to the hot water supply solenoid valve a.
z and the proportional control valve a3 to the hot water supply burner 0a, and through the reheating solenoid valve α9 to the reheating burner αe.

Water supply detection element σ that detects water supply in the water supply side passage and issues a signal
At the same time, a hot water supply thermistor α is provided at the outlet of the hot water supply heat exchanger (1). A circulating water detection element α9 is provided to detect the circulation of hot water between the pump (3) and the rear-end heat exchanger (2), and a reheating thermistor (2) is provided at the inlet of the rear-end heat exchanger (2). The hot water heater T2D is connected to the hot water supply port 1b through a hot water supply pipe to a bathroom or kitchen, for example, and a hot water supply control valve, hopper, and water level sensor (to) for automatically supplying hot water to the bathtub (4). An automatic hot water supply knit having a water supply system is installed branching off from the hot water supply pipe (c) and connected to the bathtub (4).

Actuators (electromagnetic valves, solenoid valves,
(pump, etc.) is configured to be operated by a control circuit (5) and a remote control (2).

Next, the operation will be explained.

By opening the hot water supply pipe υ, the water supply detection element o71 is operated, the main solenoid valve aυ, the hot water supply solenoid valve 02, and the proportional control valve Q hot water are opened, and the hot water supply burner (141) is ignited and the hot water supply thermistor αa is activated. The temperature of the hot water can be controlled by the remote control (
The proportional control valve o3 is operated with the output calculated by the control circuit (5) so that the hot water temperature set by the hot water temperature setting device (not shown) is reached, and the hot water supply burner α It is configured to stably control the temperature of hot water by controlling the amount of combustion.

On the other hand, by operating the reheat switch (not particularly shown) provided on the bottom of the remote control, the pump (3) is operated and the bathtub (
4) The water or hot water stored in advance circulates, the circulating water detection element an operates, and the main solenoid valve αB and the reheating solenoid valve α9 are activated.
The valve opens and the reheating burner (1e) is ignited.

The temperature of the returned water being circulated is sensed, and the rear-end heat exchanger (2
) The control circuit (5) is operated so that the bath boiling temperature reaches the signal from the reheating thermistor installed at the entrance of The heating solenoid valve (I5) is operated to control the combustion amount of the reheating burner αe, thereby stably controlling the circulating hot water and controlling the bath water temperature.

In addition, there is an automatic hot water switch (
(not shown), the automatic hot water supply unit's hot water supply control valve c! When valve 41 is opened, the proportional control valve α is operated with the output processed by the control circuit (3) so that the automatic hot water temperature is set by the hot water temperature setting device (not shown) on the remote control (to).
By operating the hot water supply burner α core and controlling the combustion amount of the hot water supply burner α core to stably control the hot water @ temperature, automatic hot water supply to the bathtub (4) and automatic temperature control of the bath N temperature are realized. There is.

Problems to be Solved by the Invention However, in the above configuration, the automatic hot water supply unit (to) must be installed in the immediate vicinity of the bathtub (4), and due to the structure of the building, the bathroom is not located in the center of the room. In some cases, it is impossible to install it, and even if it can be installed on the wall, it is problematic in terms of appearance and aesthetics of the building. Additionally, it was necessary to make holes in the bathtub for pipe connections at designated locations.

In view of the above-mentioned problems, the present invention aims to provide an automatic hot water supply function that is low in cost, free of installation, and effective in terms of workability and aesthetics.

Means for Solving the Problems The present invention provides a heat exchanger for hot water supply, a rear-end heat exchanger for a hot water circulation passage connected to a bathtub and for circulating hot water using a pump, a proportional control valve connected in series to the original solenoid valve, and a proportional control valve connected in series to the solenoid valve. A solenoid valve for hot water supply connected to a burner for hot water supply branched from the proportional control side valve and connected to the burner for hot water supply, a solenoid valve for follow-up connected to the burner for reheating, a thermistor for hot water supply provided at the outlet of the heat exchanger for hot water supply, and A reheating thermistor provided at the entrance of the reheating heat exchanger; an automatic hot water supply path for a bathtub having a hot water supply control valve that branches from a hot water supply path downstream of the hot water supply thermistor and connects to the bathtub to supply hot water to the bathtub; An automatic drain with a three-way electric valve that branches from the hot water circuit downstream of the reheating heat exchanger and drains the water in the bathtub, a cleaning agent tank and a cleaning agent tank for injecting the cleaning agent into the return port of the hot water circulation. The cleaning agent injection solenoid valve is opened, the hot water supply control valve is opened, and the proportional control valve is operated in response to a control signal calculated using the signal from the hot water supply thermistor to control the combustion amount of the hot water supply burner. If the signal from the thermistor exceeds the hot water supply capacity, the pump is operated, the follow-up solenoid valve is also opened, and the combustion burner is simultaneously combusted to automatically supply hot water to the bathtub. The connection between the automatic hot water supply and the hot water circulation path for reheating is made up of a single adapter installed on the bottom of the bathtub.

Function of the present invention) With the above configuration, during hot water supply operation, the proportional control valve is operated by the output calculated by the control circuit based on the signal from the hot water supply thermistor, and the combustion amount of the hot water supply burner is controlled, thereby stabilizing the hot water temperature. At the same time, during reheating operation, the proportional control valve is operated by the output calculated by the control circuit using the reheat thermistor signal, and the combustion amount of the reheat burner is controlled, thereby stably controlling the bath water temperature. can do.

In addition, during simultaneous operation, the control circuit operates the proportional control valve using the output calculated in the hot water supply mode to stably control the hot water temperature, and the reheating side uses the reheating thermistor signal to follow up. By controlling the opening and closing of the solenoid valve, the bathtub water temperature can be stably controlled.

Furthermore, during automatic hot water supply operation, by opening the hot water supply control valve, automatic hot water supply t7 to the bathtub through the hot water supply heat exchanger,
The automatic hot water supply water temperature is processed by the control circuit using the signal from the hot water supply thermistor, and the proportional control valve is operated to control the combustion amount of the hot water supply burner so that the bathtub temperature follows the desired bath boiling temperature. It can be completed by just automatic hot water supply operation without driving the machine.

In addition, when the hot water supply thermistor signal exceeds the hot water supply capacity during automatic hot water supply to the bathtub, the pump is operated, the follow-up solenoid valve is also opened, and the reheating burner is simultaneously combusted, allowing the automatic hot water supply circuit to The hot water and the hot water from the outlet of the reheating circulation passage are mixed with an adapter installed at the bottom of the bathtub, and are sprayed onto the bottom of the bathtub to maintain a constant temperature of hot water supply to the bathtub, making the hot water temperature distribution in the bathtub uniform, and The reheating thermistor accurately detects the temperature inside the bathtub by inhaling hot water from the top of the bathtub, which is not affected by the high temperature water from the reheating inlet and automatic hot water supply port, through the reheating return port installed in the bathtub. The bathtub water temperature can be automatically heated to the desired bath boiling temperature in a short time.

Furthermore, to clean the bathtub after bathing, the cleaning agent in the cleaning agent tank provided in the bathroom is injected into the return port of the hot water circulation path using the suction force of the pump by opening the cleaning agent injection solenoid valve. The injected cleaning agent can clean the inside of the bathtub while being circulated between the hot water circulation path and the bathtub by the rotation of the pump.

Also, by switching the three-way electric valve provided downstream of the reheating heat exchanger, water after bathing can be automatically drained. In addition, the number of parts can be reduced, the cost of the automatic water supply function can be reduced, and installation is free, making it easy to construct and aesthetically effective, thereby achieving the purpose.

Embodiment FIG. 1 shows a schematic diagram of the construction of an embodiment of the water heater with reheating device of the present invention.

The same symbols as in FIG. 2 indicate the same parts and portions.

In the figure, IC is an automatic hot water supply port, 2C is an automatic drain port, 翺 is a safety valve, (7) is an adapter, ■ is a three-way electric valve, ■ is a cleaning agent tank, and (b) is a cleaning agent injection solenoid valve.

The configuration of the water heater with reheating device of the present invention will be explained.

(1) is a heat exchanger for hot water supply; water supply port 1a and hot water supply port 1
b and the automatic hot water supply port 1c via the hot water supply control valve C41, and has a water supply detection element (such as a water amount sensor that counts the amount of water) αη that detects water supply and outputs a signal in the water supply side passage. (2) is a heat exchanger for reheating, which is connected to the hot water return port 2a, the hot water column bottom 2b, and the automatic drain port 2°. A pump (3) and a circulating water detection element a that detects the circulation of feed water are installed in the hot water passage from the hot water return port 2a to the reheating heat exchanger (2).
Also, a cleaning agent tank (to) is installed at the return port of the hot water passage.
A three-way electric valve 02 is installed in the hot water passage leading to the hot water inlet 2b and the reheating heat exchanger (2). Mouth 2
b is connected to an adapter (to) provided on the bottom of the bathtub (4) through a connecting pipe (5) to form a hot water circulation passage.

An exhaust stack (6) is connected to the heat exchangers (1) and (2),
Exhaust the combustion exhaust gases through the exhaust port (8) by the exhaust fan (7)
Configure it to emit to In addition, combustion air is supplied to the hot water inlet (
9) is formed in a part of the case so that it can be supplied from. The combustion passage connects the original solenoid valve αυ and the proportional control valve a3 in series, and branches through the hot water supply solenoid valve a3 to the hot water supply burner α4 and the reheating solenoid valve α9 to the reheating burner (Ie, Connect the branch so that the control valve 0 is connected in common.The signal of the thermistor OS for hot water provided at the outlet of the hot water heat exchanger (1) and the hot water temperature setting device (not shown) of the remote control (to) are connected. ) so that the proportional control valve
3 is operated to control the combustion amount of the hot water supply burner α→ to stably control the temperature of hot water.

On the other hand, the bath is heated using the signal from the reheating thermistor (to) installed at the entrance of the reheating heat exchanger (2) and the bath water temperature setting device (not shown) on the remote control (to). The proportional control valve αl is operated with the output calculated by the control circuit gradient so that the temperature is controlled, the combustion amount of the reheating burner (IQ) is controlled, the circulating water is stably controlled, and the bathtub water temperature is adjusted. It is configured to control.

In addition, in order to make the bath water temperature rise quickly, the proportional control valve α
The combustion amount of burner αG for reheating, which is controlled by the difference, is controlled at the maximum capacity without proportional control until the bath boiling temperature is set by the bath water temperature setting device, and when the boiling temperature is reached, the reheating electromagnetic The control circuit (equipment) is configured to close the valve (i!19).The solenoid valve α for hot water supply and the solenoid valve α9 for reheating are configured to open and close when controlling the respective hot water temperatures. It is composed of:

In addition, during simultaneous operation, the control circuit (5) operates the proportional control valve α-ken to stably control the hot water temperature using the output calculated in the hot water supply mode, and the reheating side is used for reheating. The bathtub water temperature is stabilized and controlled by controlling the opening and closing of the reheating solenoid valve α using the signal from the thermistor.

Next, during automatic hot water supply operation, the hot water supply control valve @ is placed upstream, and an automatic hot water supply path for the bathtub, which is provided with a safety valve (vacuum breaker) (g) downstream, is provided by branching from the downstream of the thermistor α barrel for hot water supply. Then, by opening the hot water supply control valve, the output of the proportional control valve is 0 through the hot water heat exchanger (1), which is processed by the control circuit (5) according to the signal from the thermistor α barrel for hot water supply. to control the combustion amount of the hot water supply burner α4 to stably control the hot water temperature
) is configured to automatically supply hot water. In addition, when the water temperature is low such as in winter, when the hot water supply capacity is exceeded and the signal of the hot water supply thermistor aυ becomes lower than the automatic hot water supply setting temperature, the pump (3) is operated and the circulating water detection element α1 is activated. By detecting water, opening the reheating solenoid valve αe, and simultaneously combusting the reheating burner αe, the bathtub water temperature can be automatically heated to the desired bath boiling temperature in a short time with high capacity. It is composed of: Furthermore, when cleaning the bathtub (4) after bathing, by operating the cleaning switch (not shown) on the remote control, the cleaning agent in the cleaning agent tank (2) installed in the bathroom is transferred to the cleaning agent injection electromagnetic device. Open the valve (b) and turn on the pump (3)
It is injected into the return port of the hot water circulation path using the suction force of the water. The injected cleaning agent cleans the inside of the bathtub while circulating between the hot water circulation path and the bathtub (4) by the rotation of the pump (3). Next, after washing the bathtub (4), the waste water is automatically drained by operating the pump (3) and switching the three-way electric valve to the automatic drain channel.

The operation of the above embodiment will be explained.

When a hot water heater Qυ in a bathroom or kitchen, for example, is opened through a hot water supply pipe (c) connected to the hot water supply port 1b, a water supply detection element (11) detects water supply and the hot water supply operation sequence is activated. The exhaust fan (7) rotates.The main solenoid valve αυ, the hot water supply solenoid valve αa1, and the proportional control well α3 are opened to keep the fuel ignited.

(The ignition holding means is not particularly shown.) When the hot water supply burner α is combusted, the hot water heat exchanger (1) is heated, and the hot water is discharged from the hot water tap through the hot water supply port 1b.

The hot water temperature is detected by the hot water supply thermistor α, and the output is calculated by the control circuit so that the hot water temperature is set by the hot water temperature setting device (not shown) on the remote controller 4. (2) is operated to control the combustion amount of the hot water supply burner α to stably control the hot water temperature.

On the other hand, the pump (3) and exhaust fan (power) are rotated by operating a reheating operation switch (not particularly shown) provided on the remote control (to).

When the hot water or water previously stored in the bathtub (4) is circulated by the pump (3), the circulating water detection element α1 detects it and a follow-up operation sequence is activated.
υ, the reheating solenoid valve α9 and the proportional control valve fi31 are opened to maintain the ignition of the fuel (the ignition retaining means is not particularly shown). When the reheating burner 09 burns, the reheating heat exchanger (2) is heated, and the heat is circulated in the bathtub (4) through the connecting pipe (5) from the hot outlet 2b and through the adapter (7). Hot water is circulated to the hot water return port 2a. Reheat the circulating hot water that is equal to the water temperature in the bathtub (4) - so that the bath boiling temperature is set by Mr. Kan's signal and the bathtub water temperature setting device (not shown) on the remote control (to). The proportional control valve α is operated using the output calculated by the control circuit, and the combustion amount of the reheating burner αG is controlled to stably control the circulating hot water and the bath water temperature.

In addition, in order to make the bath water temperature rise quickly, a proportional control valve (
Reheating burner controlled for 1 hot water (controls the combustion amount of 1e to the bath boiling temperature set with the bathtub water temperature setting device at maximum capacity without proportional control, and reheats when the boiling temperature is reached. Close the combustion solenoid valve α9.

In addition, when the automatic hot water supply operation switch provided on the remote control (to) is operated, the hot water supply control valve C4 is opened and the hot water supply heat exchanger (
11, hot water is automatically supplied to the bathtub (4) from the automatic hot water supply port 10 via the automatic hot water supply connection pipe Gυ, and from the adapter (to) provided on the bottom of the bathtub (4).

The water supply detection element (I7) detects the water supply and an automatic hot water supply operation sequence is activated, and the exhaust fan (7) rotates.

The main solenoid valve αυ, the hot water supply solenoid valve α, and the proportional control valve α are opened to keep the fuel ignited (the ignition holding means is not particularly shown). When the hot water supply burner α4 burns, the hot water heat exchanger (11) is heated, and hot water is automatically supplied from the automatic hot water supply inlet IC to the bathtub (4).The hot water supply temperature is detected by the hot water supply thermistor α2, and the remote control The proportional control valve α■ is operated with the output calculated by the control circuit (5) so that the hot water temperature set by the bathtub water temperature setting device (not shown) is reached, and the combustion amount of the hot water supply burner I is controlled. The hot water temperature is controlled stably and hot water is automatically supplied to the bathtub (4).

By doing this, it is possible to complete the automatic hot water supply operation only without reheating the bath to the desired temperature.

In addition, when the water temperature is low such as in winter, when the hot water supply capacity is exceeded and the signal from the thermistor α barrel for hot water becomes lower than the automatic hot water temperature setting, the pump (3) is operated and the reheating electromagnetic Valve αS is also opened and burner αe for reheating is also combusted at the same time to perform automatic hot water supply and reheating operation at the same time, resulting in a large-capacity remote control bath water temperature setting device (not shown).
The reheating heat exchanger (
The reheating thermistor installed upstream of 2) senses the temperature of the water in the bathtub (4), and by opening and closing the reheating solenoid valve α, the temperature of the bath water in the bathtub (4) is adjusted to the desired temperature. It can automatically supply hot water to the bath boiling temperature in a short period of time.

The amount of hot water supplied to the bathtub (4) uses a water amount sensor that counts the amount of water supplied to the water supply detection element αD, so it detects the amount of water for ignition and extinguishing, and automatically activates the hot water supply control valve C! (
4) The automatic hot water supply can be stopped by closing the valve.

The safety valve (vacuum breaker) (g) is designed to provide an air layer downstream from the hot water supply control valve @ to prevent backflow from the bathtub circulation path to the hot water supply circuit when automatic hot water supply operation is stopped.

In addition, the bathtub (4) can be cleaned after bathing by operating the cleaning switch (not shown) on the remote controller (to) to inject the cleaning agent in the cleaning agent tank (to) installed in the bathroom using the cleaning agent injection solenoid valve G4. is opened, the pump (3) is operated, and the hot water is injected into the return port of the hot water circulation path using the suction force of the pump (3).

The injected cleaning agent cleans the inside of the bathtub (4) while being circulated between the hot water circulation path and the bathtub (4) by operation of the pump (3). Next, switch the three-way electric valve 03 to the automatic drain channel to drain the waste water after cleaning the bathtub (4), and then use the pump (3) to drain the waste water.
The water in the bathtub (4) is drained from the automatic drain port 2C. When the circulating water detection element 0 senses that the water in the bathtub (4) has been completely drained, the three-way electric valve G3 and the pump (
3) can be stopped at the same time to automate the cleaning of the bathtub and the drainage of sewage in the bathtub.

Effect of the invention The present invention has the following effects due to the above configuration.

1. Since the hot water temperature is controlled by proportionally controlling the combustion amount using one proportional control valve for both hot water supply and reheating, the hot water temperature can be stabilized.

2. In particular, the bathtub water temperature can be controlled by proportional control through automatic hot water supply, so energy savings can be achieved compared to conventional hot water temperature control using Hl-Lo-OFF or ON-OFF control.

3. Since the automatic hot water supply function is built into the main body, the cost can be reduced, installation is free, and construction workability can be improved, and the appearance of the building is not impaired.

4. By changing the water supply detection element to a water flow sensor that counts the amount of water supplied, during automatic hot water supply, the amount of hot water supplied to the bathtub can be arbitrarily set and stopped automatically, and the amount of water for ignition and extinguishing can be adjusted as required by conventional methods. There is no need for a water level sensor to detect the water level in the bathtub other than the sensor for detection.

5. Since hot water can be supplied automatically with the bathtub lid closed, there is no leakage and it is economical to save energy. 06. The bath can be heated to the desired bath temperature without reheating, just by automatic hot water supply operation. This eliminates the need for reheating after automatic hot water supply as in conventional systems, which shortens the time it takes for the bath to boil, making it possible to enjoy an economical and comfortable bathing experience.

7. When the water temperature is low, such as during winter, if the hot water supply capacity is exceeded and the hot water supply thermistor signal becomes lower than the automatic hot water supply setting temperature, the pump is operated and the solenoid valve for reheating is also opened to perform reheating. By igniting the firing burner and performing automatic hot water supply and reheating operations at the same time, it is possible to automatically supply hot water in the bathtub to the desired bath boiling temperature in a short time with high capacity. In addition, automatic hot water supply and reheating outlet can be connected to the bathtub.
The adapter at the bottom of the bathtub allows the hot water to be collected in one place and mixed and then spouted out to the bottom of the bathtub, making it possible to make the temperature of the bathwater uniform.

8. Since the connection to the bathtub is at the bottom and the drainage function is built into the device, there is no need for a drain in the bathtub itself, and the conventional bathtub drain can be used as the adapter connection port, making it easy to attach the adapter to the bathtub. No hole drilling required.

9. Bathtubs can be automatically cleaned by injecting the detergent in the replenishable detergent tank installed in the bathroom into the hot water circulation path using the suction power of the pump into the return port of the hot water circulation path and circulating it between bathtubs. .

10. Bathtub water can be drained remotely, automating everything from supplying water to boiling water to cleaning and draining the bathtub after bathing.

[Brief explanation of the drawing]

Fig. 2 shows a schematic diagram of the construction of an embodiment of the water heater with reheating device of the present invention, and Fig. 2 shows a schematic diagram of the construction of a conventional example. 1: Heat exchanger for hot water supply 2: Heat exchanger for reheating h: Bomb 4: Bathtub 22, 5: Connection pipe 1]: Original solenoid valve
12: Solenoid valve for hot water supply 13: Proportional control valve 14: Burner for hot water supply 15: Solenoid valve for reheating 16: Burner for reheating 17: Water supply detection element 18: Thermistor for hot water supply
19: Circulating water detection element 20: Reheating thermistor 2
4: Hot water supply control valve 27: Control circuit 28: Remote control
3o: Adapter 32: Three-way electric valve 33: Cleaning agent tank 34: Cleaning agent injection solenoid valve 1a: Water supply port 1
b: Hot water supply port 1c: Automatic hot water supply port 2a: Hot water return port 2
b: Hot water spout 2C: Automatic drain port

Claims (1)

[Claims] A heat exchanger for hot water supply, a follow-up heat exchanger for a hot water circulation path that is connected to a bathtub and circulates hot water using a pump, a proportional control valve that is connected in series to the original solenoid valve, and a burner for hot water supply that is branched from and connected to the proportional control valve. A solenoid valve for hot water supply connected to the solenoid valve for reheating connected to the burner for reheating, a thermistor for hot water supply provided at the outlet of the heat exchanger for hot water supply, and a reheating solenoid valve provided at the inlet of the heat exchanger for reheating. an automatic bathtub water supply path having a hot water supply control valve that branches from the hot water supply passage downstream of the hot water supply thermistor, connects to the bathtub, and supplies hot water to the bathtub, and a hot water circulation path downstream of the reheating heat exchanger. an automatic drain channel having a three-way electric valve branching from the bathtub to drain water in the bathtub; a detergent tank and a detergent injection solenoid valve for injecting the detergent into the return port of the hot water circuit; and the hot water supply control valve. When the valve is opened and the proportional control valve is operated by a control signal calculated using the signal of the hot water supply thermistor to control the combustion amount of the hot water supply burner, and the signal of the hot water supply thermistor exceeds the hot water supply capacity. includes a control circuit that operates the pump, opens the reheating solenoid valve, and simultaneously burns the reheating burner to automatically supply hot water to the bathtub, and a connection between the automatic hot water supply to the bathtub and the hot water circulation path for reheating. A water heater with a reheating device, which consists of a single adapter installed on the bottom of the bathtub.