Gas water heater system

Abstract

The utility model belongs to the technical field of gas water heater systems, and discloses a gas water heater system, which is characterized in that a bypass switch valve for controlling the on-off of the gas water heater system is arranged on a bypass pipeline, and a water return switch valve for controlling the on-off of the gas water heater system is arranged on a water return pipeline, so that the conduction of an inner circulation loop and the conduction of an outer circulation loop are mutually independent; therefore, water preheating in the outer circulation loop and water preheating in the inner circulation loop are mutually independent and do not affect each other, the situation that when only one of the inner circulation loop and the outer circulation loop is conducted, the water preheating time is affected by the other circulation loop is avoided, and gas waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heater systems, in particular to a gas water heater system. Background Art

[0002] In the prior art, gas water heaters have the problems of temperature rise when water is stopped and temperature drop of secondary water. Specifically, after the user stops using water for a period of time, the gas water heater automatically stops heating, and the water in the water outlet pipe is still high-temperature hot water. Moreover, due to the residual temperature of the heat exchanger, the water in the heat exchange tube in the heat exchanger will continue to be heated. When the user uses water again, the high-temperature hot water in the water outlet pipe will be provided to the user first. This is the problem of temperature rise when water is stopped, which can easily scald the user. After the hot water in the water outlet pipe is discharged, the cold water in the water inlet pipe enters the heat exchanger and is delivered to the user after heat exchange and temperature rise in the heat exchanger. However, since the cold water in the water inlet pipe has not yet had time to exchange heat and temperature rise with the heat exchanger, low-temperature cold water is delivered to the water outlet pipe for the user. This is the problem of temperature drop of secondary water, which seriously affects the user experience.

[0003] To this end, the prior art proposes that between each ignition and shutdown, an internal circulation loop is formed inside the gas water heater to send the hot water in the hot water pipe to the cold water pipe, and the cold water in the cold water pipe to the heat exchanger, and the residual heat of the heat exchanger is used for heating to avoid the problem of alternating hot and cold water output.

[0004] However, for a gas water heater with a zero cold water function, the gas water heater also has an external circulation loop. When the water in the internal circulation loop circulates, it will inevitably cause the water in the external circulation loop to circulate as well. This will cause part of the hot water to be diverted to the external circulation loop. The process of replacing the cold water in the cold water pipe with hot water is relatively slow, wasting gas. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a gas water heater system, which can realize internal circulation preheating and external circulation preheating independently, avoid gas waste, and improve the user's water use experience.

[0006] The above technical problems are solved by the following technical solutions:

[0007] A gas water heater system comprises a gas water heater and a water return device, wherein the gas water heater comprises a main heat exchanger, the main heat exchanger has a cold water inlet and a hot water outlet, the cold water inlet is connected to a cold water pipe, and the hot water outlet is connected to a hot water pipe;

[0008] The gas water heater further comprises a bypass pipeline, one end of which is connected to the cold water pipe at a bypass connection position of the cold water pipe, and the other end of which is connected to the hot water pipe. A water pump is provided on the cold water pipe, and the water pump is located between the cold water inlet and the bypass connection position. A bypass switch valve and a bypass check valve are provided on the bypass pipeline, and the bypass check valve is used to allow water in the hot water pipe to flow to the cold water pipe in one direction through the bypass pipeline;

[0009] The water return device also includes a return water pipeline, which is arranged in parallel with the bypass pipeline. The bypass pipeline is closer to the main heat exchanger than the return water pipeline. A return water switch valve and a return water check valve are provided on the return water pipeline. The return water check valve is used to allow the water in the hot water pipe to flow in one direction to the cold water pipe through the return water pipeline.

[0010] Compared with the background technology, the gas water heater system provided by the utility model has the following beneficial effects:

[0011] By arranging a bypass switch valve that controls its own on-off on the bypass pipeline and a return water switch valve that controls its own on-off on the return water pipeline, the conduction of the inner circulation loop and the conduction of the outer circulation loop are independent of each other, so that the water preheating in the outer circulation loop and the water preheating in the inner circulation loop are independent of each other and do not affect each other, avoiding the water preheating time being affected by the other circulation loop when only one of the inner circulation loop and the outer circulation loop is turned on, thereby avoiding gas waste.

[0012] In some embodiments, the bypass switch valve is disposed at the inlet of the bypass check valve;

[0013] And / or, the water return switch valve is arranged at the inlet of the water return one-way valve.

[0014] In some embodiments, the gas water heater further includes a master controller, the master controller is connected to a first wireless communication unit, and the water return device further includes:

[0015] A water return controller, wherein the water return controller is connected to a second wireless communication unit, the second wireless communication unit and the first wireless communication unit are capable of wireless communication, and the water return controller is electrically connected to the water return switch valve;

[0016] The energy storage battery is used to supply power to the water return switch valve and the water return controller.

[0017] In some embodiments, the gas water heater system further comprises a water return housing, wherein the water return controller, the water return check valve, the water return switch valve and the energy storage battery are all arranged in the water return housing;

[0018] Both ends of the cold water pipe are arranged outside the water return housing; and / or the hot water pipe is arranged outside the water return housing.

[0019] In some embodiments, the outer wall of the water return housing is provided with a waterproof layer.

[0020] In some embodiments, the water return housing is filled with potting glue, and the water return controller, the water return check valve, and the water return switch valve are encapsulated in the potting glue.

[0021] In some embodiments, the energy storage battery is detachably installed in the return water shell, and a disassembly and assembly port is provided on the return water shell for allowing the energy storage battery to enter and exit the return water shell through the disassembly and assembly port; the return water shell is sealed with a movable sealing cover for opening and closing the disassembly and assembly port.

[0022] In some embodiments, a partition is provided in the return water shell, and the partition divides the inner cavity of the return water shell into a first installation cavity and a second installation cavity which are not connected to each other. The energy storage battery is located in the first installation cavity, and the return water controller, the return water check valve, and the return water switch valve are located in the second installation cavity.

[0023] In some embodiments, the cold water pipe is provided with an insulated water tank, and the insulated water tank is located between the water pump and the cold water inlet;

[0024] The gas water heater also includes a first temperature detection unit for detecting the outlet water temperature of the thermal insulation water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the principle of the gas water heater system provided by the embodiment of the utility model.

[0026] In the figure:

[0027] 100, gas water heater; 101, cold water pipe; 102, main heat exchanger; 103, hot water pipe; 104, bypass pipeline; 105, bypass switch valve; 106, bypass check valve; 107, water pump; 108, insulation water tank; 109, first temperature detection unit; 110, second temperature detection unit; 111, main controller; 112, first wireless communication unit; 113, cold water main pipe; 114, flow detection unit;

[0028] 200, water return device; 201, water return pipeline; 202, water return switch valve; 203, water return check valve; 204, water return controller; 205, energy storage battery; 206, second wireless communication unit; 207, third temperature detection unit;

[0029] 300. Water-using parts. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 1 As shown, an embodiment of the utility model provides a gas water heater system, including a gas water heater 100, the gas water heater 100 includes a burner and a main heat exchanger 102, the main heat exchanger 102 has a cold water inlet and a hot water outlet, the cold water inlet is connected to a cold water pipe 101, the hot water outlet is connected to a hot water pipe 103, and a water pump 107 is provided on the cold water pipe 101.

[0035] The cold water pipe 101 and the hot water pipe 103 are connected at the water-using end through a mixing valve, and the outlet of the mixing valve is connected to a water-using component 300, such as a faucet or a shower. When the gas water heater 100 is working, the water pump 107 sends cold water into the main heat exchanger 102 through the cold water inlet, and the burner works to heat the cold water flowing through the main heat exchanger 102 to form high-temperature hot water, which is sent to the hot water pipe 103 through the hot water outlet. The cold water and the high-temperature hot water are mixed in the mixing valve and sent to the water-using component 300 for users to use.

[0036] The gas water heater 100 further includes a bypass pipeline 104, one end of which is connected to the cold water pipe 101 at the bypass connection position of the cold water pipe 101, and the other end is connected to the hot water pipe 103, and the water pump 107 is located between the cold water inlet and the bypass connection position. For ease of understanding, the two ends of the bypass pipeline 104 are respectively recorded as a bypass water inlet end and a bypass water outlet end, the bypass water inlet end is connected to the hot water pipe 103, and the bypass water outlet end is connected to the cold water pipe 101 at the bypass connection position of the cold water pipe 101.

[0037] The gas water heater system further includes a cold water main pipe 113 , which is connected to the cold water pipe 101 at a cold water supply position of the cold water pipe 101 , and a bypass connection position is located between the cold water supply position and the water pump 107 .

[0038] The bypass pipeline 104 is provided with a bypass switch valve 105 and a bypass check valve 106. The bypass check valve 106 is used to allow the water in the hot water pipe 103 to flow to the cold water pipe 101 in one direction through the bypass pipeline 104. Exemplarily, the bypass switch valve 105 is provided at the inlet of the bypass check valve 106. The bypass pipeline 104 and the main heat exchanger 102 are connected end to end to form an internal circulation loop, and the bypass switch valve 105 controls the on-off of the internal circulation loop.

[0039] The water return device 200 further includes a water return pipeline 201, which is arranged in parallel with the bypass pipeline 104, and the water return pipeline 201 is closer to the main heat exchanger 102 than the bypass pipeline 104. In other words, the water return pipeline 201 is closer to the mixing valve than the bypass pipeline 104. Specifically, the water return pipeline 201 is arranged near the mixing valve, and the distance between the water return pipeline 201 and the mixing valve can be limited so that the water return pipeline 201 is as close to the mixing valve as possible.

[0040] The return water pipeline 201 is provided with a return water switch valve 202 and a return water check valve 203. The return water check valve 203 is used to allow the water in the hot water pipe 103 to flow to the cold water pipe 101 in one direction through the return water pipeline 201. Exemplarily, the return water switch valve 202 is provided at the inlet of the return water check valve 203. The main heat exchanger 102 and the return water pipeline 201 are connected end to end to form an external circulation loop, and the return water switch valve 202 controls the on-off of the external circulation loop.

[0041] When the return water switch valve 202 is controlled to make the external circulation loop conductive, the main heat exchanger 102 and the water pump 107 are controlled to work, and the water in the external circulation loop circulates to preheat the water in the external circulation loop.

[0042] When the bypass switch valve 105 is controlled to make the internal circulation loop conductive, the water pump 107 is controlled to operate, and the water in the internal circulation loop circulates to preheat the water in the internal circulation loop.

[0043] By arranging a bypass switch valve 105 for controlling its own on-off on the bypass pipeline 104 and a return water switch valve 202 for controlling its own on-off on the return water pipeline 201, the conduction of the inner circulation loop and the conduction of the outer circulation loop are independent of each other, so that the water preheating in the outer circulation loop and the water preheating in the inner circulation loop are independent of each other and do not affect each other, avoiding the water preheating time being affected by the other circulation loop when only one of the inner circulation loop and the outer circulation loop is turned on, thereby avoiding gas waste.

[0044] In some embodiments, the gas water heater 100 also includes a main controller 111, the bypass switch valve 105 is an electromagnetic switch valve, the bypass switch valve 105, the water pump 107 and the main controller 111 are electrically connected, and the main controller 111 controls the opening and closing of the bypass switch valve 105 and the start and stop of the water pump 107.

[0045] In some embodiments, the water return device 200 further includes a water return controller 204 that is communicatively connected to the master controller 111. The water return switch valve 202 is a solenoid switch valve, and the water return switch valve 202 is electrically connected to the water return controller 204. The water return controller 204 controls the opening and closing of the water return switch valve 202.

[0046] In some embodiments, the main controller 111 is connected to the return water controller 204 through a wireless communication module. Specifically, the wireless communication module includes a first wireless communication unit 112 and a second wireless communication unit 206. The first wireless communication unit 112 is electrically connected to the main controller 111, and the second wireless communication unit 206 is electrically connected to the return water controller 204. The first wireless communication unit 112 and the second wireless communication unit 206 can be connected to each other by wireless communication. In this way, the communication line connecting the main controller 111 and the return water controller 204 can be eliminated, the exposed wiring can be reduced, the wiring chaos can be avoided, the aesthetic effect of the gas water heater system can be improved, and the user experience can be improved.

[0047] In some embodiments, the water return device 200 further includes an energy storage battery 205, which is used to power the water return switch valve 202, the bypass switch valve 105, and the water return controller 204. The water return device 200 is powered by the energy storage battery 205 alone, and there is no need to arrange exposed wires, which reduces exposed wiring, avoids wiring chaos, improves the aesthetic effect of the gas water heater system, and thus improves the user experience.

[0048] Since the return water device 200 is close to the mixing valve, the return water device 200 is more likely to contact water. Therefore, in some embodiments, the gas water heater system further includes a return water housing, and the return water controller 204, the return water check valve 203, the return water switch valve 202 and the energy storage battery 205 are all arranged in the return water housing, and the outer wall of the return water housing is provided with a waterproof layer. The return water controller 204, the return water check valve 203, the return water switch valve 202 and the energy storage battery 205 are waterproofed by the return water housing and the waterproof layer arranged on the outer wall of the return water housing to ensure that each electrical component in each return water device 200 can work normally.

[0049] Since the electrical components in the water return device 200 generate heat during operation, in order to ensure that the electrical components in the water return device 200 do not fail to work normally due to excessive temperature, in some embodiments, both ends of the cold water pipe 101 pass through the water return housing. The cold water flowing in the cold water pipe 101 cools down the electrical components in the water return housing to prevent the temperature in the water return housing from being too high and affecting the operation of the electrical components.

[0050] In some embodiments, the hot water pipe 103 is disposed outside the water return housing, so that the hot water flowing in the hot water pipe 103 can be prevented from affecting the temperature in the water return housing.

[0051] In some embodiments, the energy storage battery 205 is detachably installed in the return water shell, and a disassembly port is provided on the return water shell for allowing the energy storage battery 205 to enter and exit the return water shell through the disassembly port; the return water shell is sealed with a movable sealing cover for opening and closing the disassembly port.

[0052] When the energy storage battery 205 runs out of power, the disassembly and assembly port can be opened through the sealing cover to replace the energy storage battery 205 to meet the power demand of the electrical components in the water return device 200.

[0053] Exemplarily, when the sealing cover closes the disassembly opening, a sealing member, such as a sealing strip, is provided between the contact surface of the sealing cover and the water return housing to prevent water vapor from entering the water return housing through a gap between the sealing cover and the water return housing.

[0054] In some embodiments, the return water shell is filled with potting glue, and the return water controller 204, the return water check valve 203, and the return water switch valve 202 are encapsulated in the potting glue, and the return water controller 204, the return water check valve 203, and the return water switch valve 202 are sealed and waterproofed by the potting glue.

[0055] Specifically, a partition is provided in the return water shell, which divides the return water shell into a first installation cavity and a second installation cavity which are not connected to each other. The energy storage battery 205 is detachably arranged in the first installation cavity, and the return water controller 204, the return water check valve 203, and the return water switch valve 202 are located in the second installation cavity to prevent water vapor from entering the second installation cavity when replacing the energy storage battery 205.

[0056] In some embodiments, a heat preservation water tank 108 is provided on the cold water pipe 101, and the heat preservation water tank 108 is located between the water pump 107 and the cold water inlet; the gas water heater 100 further includes a first temperature detection unit 109, which is used to detect the outlet water temperature of the heat preservation water tank 108. Exemplarily, the first temperature detection unit 109 is a temperature sensor electrically connected to the main controller 111.

[0057] In the process of preheating the water in the inner circulation loop, the cold water in the insulation water tank 108 is continuously sent to the main heat exchanger 102, and the hot water continuously enters the insulation water tank 108. When the outlet water temperature of the insulation water tank 108 rises to the first set temperature, the water preheating in the inner circulation loop ends, and the insulation water tank 108 is basically full of hot water. When the user uses hot water, the hot water in the insulation water tank 108 will enter the hot water pipe 103 through the main heat exchanger 102 for the user to use. When all the hot water in the insulation water tank 108 flows out, the gas water heater 100 has been running for a period of time, and the main heat exchanger 102 has been able to stably heat the cold water flowing into it, so that the mixing valve will not have cold water flowing out, so that the user can directly flow out the hot water when opening the mixing valve of the gas water heater 100, and there is no problem of alternating between hot and cold water, thereby avoiding waste of water resources.

[0058] In some embodiments, the gas water heater 100 further includes a second temperature detection unit 110 for detecting the water temperature of the hot water outlet, and the second temperature detection unit 110 is electrically connected to the main controller 111. When the user does not use hot water, the water temperature of the hot water outlet is monitored in real time by the second temperature detection unit 110. When the water temperature of the hot water outlet is lower than the second set temperature, the water in the external circulation loop is preheated so that when the user uses water, hot water flows out, realizing the zero cold water function. Exemplarily, the second temperature detection unit 110 is a temperature sensor.

[0059] In some embodiments, the water return device 200 further includes a third temperature detection unit 207 for detecting the inlet temperature of the water return switch valve 202, and the third temperature detection unit 207 is electrically connected to the water return controller 204. Exemplarily, the third temperature detection unit 207 is a temperature sensor. In the process of preheating the water in the external circulation loop, the third temperature detection unit 207 detects the inlet temperature of the water return switch valve 202 in real time. When the inlet temperature of the water return switch valve 202 meets the requirements, the water preheating in the external circulation loop ends, and the water return switch valve 202 is controlled to be closed.

[0060] In some embodiments, a flow detection unit 114 is provided at the inlet of the thermal insulation water tank 108 to detect the water flow at the inlet of the thermal insulation water tank 108. Exemplarily, the flow detection unit 114 is a flow sensor.

[0061] In some embodiments, the gas water heater 100 further includes an internal circulation control operation unit and an external circulation control operation unit, wherein the internal circulation control operation unit is used to start and close the internal circulation preheating function, and the external circulation control operation unit is used to start and close the external circulation preheating function. Exemplarily, the external circulation control operation unit and the internal circulation control operation unit are both arranged on the shell of the gas water heater 100 and are electrically connected to the main controller 111. It should be noted that the external circulation control operation unit and the internal circulation control operation unit can be a button switch, a touch screen, etc., which are not specifically limited here.

[0062] In other embodiments, the external circulation control operation unit and the internal circulation control operation unit can also be both arranged on the return water shell and electrically connected to the return water controller 204; the external circulation control operation unit can also be arranged on the shell of the gas water heater 100 and electrically connected to the main controller 111, and the internal circulation control operation unit can be arranged on the return water shell and electrically connected to the return water controller 204.

[0063] If the internal circulation preheating function is turned on, when the user stops using the gas water heater 100, the burner is controlled to be extinguished, the water pump 107 is controlled to work, and the bypass switch valve 105 is controlled to open. The water in the internal circulation loop circulates until the outlet water temperature of the insulated water tank 108 is not less than the first preset temperature. In this way, the water in the internal circulation loop is preheated, and the water pump 107 and the bypass switch valve 105 are turned off.

[0064] If the external circulation preheating function is turned on, when the user stops using the gas water heater 100, the water temperature at the hot water outlet is monitored in real time, and when the water temperature at the hot water outlet is lower than the second preset temperature, the burner and the water pump 107 are controlled to work, and the return water switch valve 202 is opened, and the water in the external circulation loop circulates until the water temperature at the water inlet end of the external circulation reaches the third preset temperature, that is, the preheating of the water in the external circulation loop is completed, and the water pump 107, the burner and the return water switch valve 202 are turned off.

[0065] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A gas water heater system, characterized in that: The invention comprises a gas water heater (100) and a water return device (200), wherein the gas water heater (100) comprises a main heat exchanger (102), wherein the main heat exchanger (102) has a cold water inlet and a hot water outlet, wherein the cold water inlet is connected to a cold water pipe (101), and the hot water outlet is connected to a hot water pipe (103); The gas water heater (100) further comprises a bypass pipeline (104), one end of the bypass pipeline (104) being connected to the cold water pipe (101) at a bypass connection position of the cold water pipe (101), and the other end being connected to the hot water pipe (103); a water pump (107) being provided on the cold water pipe (101), and the water pump (107) being located between the cold water inlet and the bypass connection position; a bypass switch valve (105) and a bypass check valve (106) being provided on the bypass pipeline (104); and the bypass check valve (106) being used to allow water in the hot water pipe (103) to flow in one direction to the cold water pipe (101) via the bypass pipeline (104); The water return device (200) further comprises a water return pipeline (201), wherein the water return pipeline (201) and the bypass pipeline (104) are arranged in parallel, the bypass pipeline (104) is closer to the main heat exchanger (102) than the water return pipeline (201), and the water return pipeline (201) is provided with a water return switch valve (202) and a water return check valve (203), and the water return check valve (203) is used to allow water in the hot water pipe (103) to flow in one direction to the cold water pipe (101) through the water return pipeline (201).

2. The gas water heater system according to claim 1, characterized in that: The bypass switch valve (105) is arranged at the inlet of the bypass check valve (106); And / or, the water return switch valve (202) is arranged at the inlet of the water return check valve (203).

3. The gas water heater system according to claim 2, characterized in that: The gas water heater (100) further comprises a master controller, wherein the master controller is connected to a first wireless communication unit (112), and the water return device (200) further comprises: A water return controller (204), the water return controller (204) being connected to a second wireless communication unit (206), the second wireless communication unit (206) and the first wireless communication unit (112) being capable of wireless communication, and the water return controller (204) being electrically connected to the water return switch valve (202); The energy storage battery (205) is used to supply power to the water return switch valve (202) and the water return controller (204).

4. The gas water heater system according to claim 3, characterized in that: It also includes a water return housing, wherein the water return controller (204), the water return check valve (203), the water return switch valve (202) and the energy storage battery (205) are all arranged in the water return housing; Both ends of the cold water pipe (101) are arranged outside the water return housing; and / or the hot water pipe (103) is arranged outside the water return housing.

5. The gas water heater system according to claim 4, characterized in that: The outer wall of the water return housing is provided with a waterproof layer.

6. The gas water heater system according to claim 4, characterized in that: The water return housing is filled with potting glue, and the water return controller (204), the water return check valve (203), and the water return switch valve (202) are encapsulated in the potting glue.

7. The gas water heater system according to claim 6, characterized in that: The energy storage battery (205) is detachably installed in the water return housing, and a disassembly and assembly port is provided on the water return housing for allowing the energy storage battery (205) to enter and exit the water return housing through the disassembly and assembly port; the water return housing is sealed with a movable sealing cover for opening and closing the disassembly and assembly port.

8. The gas water heater system according to claim 7, characterized in that: A partition is provided in the water return housing, and the partition divides the inner cavity of the water return housing into a first installation cavity and a second installation cavity which are not connected to each other. The energy storage battery (205) is located in the first installation cavity, and the water return controller (204), the water return check valve (203), and the water return switch valve (202) are located in the second installation cavity.

9. The gas water heater system according to any one of claims 1 to 8, characterized in that: The cold water pipe (101) is provided with a heat preservation water tank (108), and the heat preservation water tank (108) is located between the water pump (107) and the cold water inlet; The gas water heater (100) further comprises a first temperature detection unit (109) for detecting the outlet water temperature of the heat-insulating water tank (108).

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