A gas-fired heating hot water boiler and its control method

Abstract

This invention relates to a gas-fired heating and hot water boiler and its control method. The gas-fired heating and hot water boiler includes a heating return pipe, a heat exchange pipe, and a heating outlet pipe connected in sequence, a heating device, a plate heat exchanger, and a circulating water pump. The plate heat exchanger is connected to the heating outlet pipe, the heating return pipe, the bathroom inlet pipe, and the bathroom outlet pipe, respectively. A cooling device includes cooling pipes, a second and third-way electrically controlled valve, and cooling components. The cooling device is located on a branch pipe of the heating return pipe or on a branch pipe at the heating outlet end. The cooling components are located on the cooling pipes. This invention, by installing a cooling function on a branch pipe of the heating return pipe or the heating outlet pipe, allows hot water in the heat exchange pipe to be transported to the cooling pipe for cooling when the bathroom water supply is turned off in bathroom mode. This avoids the problem of hot water entering the heat exchange pipe for heat exchange and generating high-temperature water, thus preventing high-temperature alarms caused by high temperature.

Description

Technical Field

[0001] This invention relates to gas-fired heating and hot water boilers, and more particularly to a gas-fired heating and hot water boiler and its control method. Background Technology

[0002] For gas-fired heating and hot water boilers with heating functions, when only the bathroom function is used and heating is not required, the water undergoes heat exchange in the main heat exchanger and then in a plate heat exchanger to provide bathroom water. When the bathroom water is turned off, a large amount of residual heat remains in the combustion chamber of the gas-fired heating and hot water boiler. This residual heat continues to heat the water in the main heat exchanger, causing it to become high-temperature water. This high-temperature water alarm is triggered, affecting user experience and extending the lifespan of the main heat exchanger. Summary of the Invention

[0003] One of the technical problems solved by this invention is to provide a gas-fired heating and hot water boiler that can solve the problem of high temperature alarm in existing gas-fired heating and hot water boilers when the bathroom water is turned off in summer when only the bathroom mode is available.

[0004] The second technical problem solved by this invention is to provide a control method for a gas-fired heating and hot water boiler, which can solve the problem of high temperature alarm in the gas-fired heating and hot water boiler in the prior art when the bathroom water is turned off in the summer when only the bathroom mode is available.

[0005] One of the above-mentioned technical problems is solved by the following technical solution:

[0006] A gas-fired heating and hot water boiler includes:

[0007] A heating circulation pipeline, which is connected to an external tap water pipeline, includes a heating return pipe, a heat exchange pipe and a heating outlet pipe connected in sequence.

[0008] Heating device, the heating device being used to heat the heating circulation pipeline;

[0009] A plate heat exchanger, wherein the first inlet of the plate heat exchanger is connected to the heating outlet pipe via a first three-way electrically controlled valve, and the first outlet of the plate heat exchanger is connected to the heating return pipe; the heating return pipe, the heat exchange pipe, the heating outlet pipe, and the plate heat exchanger form a bathroom circulation pipeline; the second inlet of the plate heat exchanger is connected to the bathroom inlet pipe, and the second outlet of the plate heat exchanger is connected to the bathroom outlet pipe;

[0010] A circulating water pump is installed on the bathroom circulation pipeline;

[0011] A cooling device includes a cooling pipe, a second three-way electrically controlled valve, and a cooling component. The inlet of the cooling pipe is connected to the heating return water pipe via the second three-way electrically controlled valve, and the outlet of the cooling pipe is connected to the heating return water pipe; alternatively, the inlet of the cooling pipe is connected to the heating outlet water pipe via the second three-way electrically controlled valve, and the outlet of the cooling pipe is connected to the heating outlet water pipe. The cooling component is disposed on the cooling pipe and is used to cool the water entering the cooling pipe.

[0012] Furthermore, the cooling component is a water storage tank.

[0013] Furthermore, the volume of the water storage tank is greater than L.

[0014] Furthermore, the water storage tank contains cold water.

[0015] Furthermore, the gas-fired heating and hot water boiler also includes a shell, and the heating device includes a burner and a main heat exchanger disposed within the shell, the main heat exchanger having the heat exchange tube and the heat exchange tube being located above the burner.

[0016] Furthermore, a gas pipe is installed at the bottom of the housing, which is connected to the burner to deliver external gas to the burner; an air outlet is provided at the top of the housing.

[0017] Furthermore, the circulating water pump is installed on the heating return water pipe, and the circulating water pump is also connected to the second outlet end of the plate heat exchanger.

[0018] Furthermore, when the inlet end of the cooling pipe is connected to the heating return water pipe through the second three-way solenoid valve and the outlet end is connected to the heating return water pipe, the first inlet end of the circulating water pump is connected to the plate heat exchanger, the second inlet end of the circulating water pump is connected to the heating return water pipe, and the outlet end of the circulating water pump is connected to the second three-way solenoid valve.

[0019] Furthermore, it also includes a one-way valve, wherein the one-way valve is disposed on the cooling pipe, and the inlet of the one-way valve is connected to the inlet end of the cooling pipe, and the outlet of the one-way valve is connected to the outlet end of the cooling pipe.

[0020] When the inlet end of the cooling pipe is connected to the heating return water pipe through the second three-way solenoid valve, and the outlet end of the cooling pipe is connected to the heating return water pipe, the one-way valve is located between the outlet end of the cooling pipe and the cooling component.

[0021] When the inlet of the cooling pipe is connected to the heating outlet pipe via a second three-way electrically controlled valve, and the outlet of the cooling pipe is connected to the heating outlet pipe, the one-way valve is located between the outlet of the cooling pipe and the cooling component.

[0022] The second technical problem mentioned above is solved by the following technical solution:

[0023] A control method for a gas-fired heating and hot water boiler, applied to a gas-fired heating and hot water boiler as described in one of the objectives of this invention, the control method comprising:

[0024] Water heater startup procedure: When the gas-fired heating water heater is connected to the power supply and started, determine whether the gas-fired heating water heater is in bathroom mode. If so, execute the bathroom startup procedure.

[0025] Bathroom start-up steps: Connect the heating outlet pipe to the first inlet of the plate heat exchanger by using the first three-way solenoid valve, and open the second inlet and third outlet of the plate heat exchanger; use the circulating water pump to transport the water in the heating return pipe to the heat exchange tube of the main heat exchanger for heating.

[0026] Bathroom water supply shutdown procedure: When the water supply to the bathroom is stopped, close the first outlet and the second inlet of the plate heat exchanger; connect the heating return pipe and the cooling pipe through the second three-way solenoid valve, so that the hot water in the heat exchange tubes can enter the cooling element for cooling; or connect the heating outlet pipe and the cooling pipe through the second three-way solenoid valve, so that the hot water in the heat exchange tubes can enter the cooling element for cooling.

[0027] Compared with the prior art, the gas-fired heating and hot water boiler of the present invention has the following advantages: The present invention adds a cooling device to the circulation pipeline of bathroom water, so that when the bathroom water is turned off, the hot water formed after heat exchange in the main heat exchanger is transported to the cooling device for cooling, so as to avoid the problem of hot water directly entering the main heat exchanger and generating high temperature water under the action of the waste heat of the burner, which would lead to a high temperature alarm. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of a gas-fired heating hot water boiler with cooling pipes located in a branch of the heating return water pipe, as provided by the present invention.

[0029] Figure 2 A schematic diagram of the structure of a gas-fired heating hot water boiler with cooling pipes located on a branch of the heating water outlet pipe, as provided by the present invention.

[0030] Labeling explanations: 1. Shell; 11. Heat exchange tube; 12. Burner; 13. Gas pipe; 14. Air outlet;

[0031] 2. Circulating water pump;

[0032] 3. First three-way electrically controlled valve;

[0033] 41. Second and third-way electrically controlled valves; 42. Cooling components; 43. Check valves; 44. Cooling piping;

[0034] 5. Plate heat exchanger;

[0035] 61. Heating return pipe; 62. Heating outlet pipe; 63. Bathroom outlet pipe; 64. Bathroom inlet pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] This invention provides a preferred embodiment of a gas-fired heating and hot water boiler, such as... Figure 1-2 As shown, it includes heating circulation pipes, heating devices, plate heat exchangers 5, circulating water pumps 2 and cooling devices.

[0041] The heating circulation pipeline is connected to an external water supply pipeline. Specifically, the heating circulation pipeline includes a heating return pipe 61, a heat exchange pipe 11, and a heating outlet pipe 62 connected in sequence. After the external water supply pipeline is connected to the heating circulation pipeline, tap water is transported into the heating circulation pipeline, thereby circulating between the heating return pipe 61, the heat exchange pipe 11, and the heating outlet pipe 62 to achieve heating.

[0042] Heating devices are used to heat the heating circulation pipes, that is, to achieve heating by heating the water in the circulation pipes.

[0043] More preferably, the gas-fired heating and hot water boiler includes a shell 1, and the heating device includes a burner 12 and a main heat exchanger disposed within the shell 1. The main heat exchanger has heat exchange tubes 11 located above the burner 12. Heat is provided by the burner 12, thereby exchanging heat with the water within the heat exchange tubes 11.

[0044] Furthermore, the first inlet of the plate heat exchanger 5 is connected to the heating outlet pipe 62 through the first three-way solenoid valve 3, and the first outlet of the plate heat exchanger 5 is connected to the heating return pipe 61.

[0045] The heating return pipe 61, heat exchange pipe 11, heating outlet pipe 62 and plate heat exchanger 5 form a bathroom circulation pipeline, and bathroom water supply is realized through the bathroom circulation pipeline.

[0046] In addition, the tap water pipe enters the plate heat exchanger 5 through the bathroom inlet pipe 64, and then enters the plate heat exchanger 5 through the heating return pipe 61, heat exchange pipe 11, and heating outlet pipe 62. Finally, it enters the bathroom outlet pipe 63 through the second outlet end of the plate heat exchanger 5 to realize bathroom water supply.

[0047] Preferably, the circulating water pump 2 is installed on the bathroom circulation pipe to provide power for water circulation. In this embodiment, the circulating water pump 2 is installed on the heating return water pipe 61, and the circulating water pump 2 is connected to the first outlet end of the plate heat exchanger 5, so as to transport the water in the plate heat exchanger 5 to the heat exchange tube 11 for heating, so as to form a water circulation for bathroom water supply.

[0048] The cooling device includes a cooling pipe 44, a second three-way electrically controlled valve 41, and a cooling component 42. The cooling component 42 is located on the cooling pipe 44 and is used to cool the water entering the cooling pipe 44.

[0049] Among them, such as Figure 1As shown, the cooling pipe 44 is located on a branch of the heating return water pipe 61. The inlet of the cooling pipe 44 is connected to the heating return water pipe 61 via a second three-way solenoid valve 41, and the outlet of the cooling pipe 44 is also connected to the heating return water pipe 61. That is, by placing the cooling pipe 44 on a branch of the heating return water pipe 61, when the bathroom is closed, hot water is transported from the heating return water pipe 61 to the cooling pipe 44 via the second three-way solenoid valve 41, so that the hot water is cooled by the cooling component 42.

[0050] More specifically, the second three-way solenoid valve 41 is installed on the heating return water pipe 61, and the second three-way solenoid valve 41 is also connected to the water inlet of the cooling pipe 44. By controlling the second three-way solenoid valve 41, the heating return water pipe 61 can be connected to the cooling pipe 44, so that hot water can enter the cooling pipe 44 and then enter the cooling component 42 for cooling.

[0051] A circulating water pump 2 is installed on the heating return water pipe 61, and its outlet is connected to a second three-way solenoid valve 41 via the heating return water pipe 61. The first inlet of the circulating water pump 2 is connected to the heating return water pipe 61, and the second inlet is connected to the first outlet of the plate heat exchanger 5. When the bathroom is closed, by controlling the second three-way solenoid valve 41, the circulating water pump 2 can transport the hot water in the plate heat exchanger 5 through the heating return water pipe 61 to the cooling pipe 44. Alternatively, the circulating water pump 2 can also be installed on the heating outlet water pipe 62, connected to the first inlet of the plate heat exchanger 5, to drive the entire bathroom water circulation. Simultaneously, one end of the second three-way solenoid valve 41 is connected to the first outlet of the plate heat exchanger 5, one end is connected to the heating return water pipe 61, and one end is connected to the cooling pipe 44. The present invention does not provide a connection diagram of the circulating water pump 2 installed on the heating outlet pipe 62. The specific installation can be adjusted according to the requirements. The installation position of the circulating water pump 2 is not limited to the structure given in this embodiment.

[0052] Preferably, the present invention further includes a one-way valve 43. The one-way valve 43 is disposed on the cooling pipe 44, and the inlet of the one-way valve 43 is connected to the inlet end of the cooling pipe 44, and the outlet of the one-way valve 43 is connected to the outlet end of the cooling pipe 44. By setting the one-way valve 43, the water flow direction of the cooling pipe 44 is ensured to be from its inlet end to its outlet end, and backflow of water is prevented.

[0053] Furthermore, when the inlet end of the cooling pipe 44 is connected to the heating return water pipe 61 via the second three-way solenoid valve 41, and the outlet end of the cooling pipe 44 is connected to the heating return water pipe 61, the one-way valve 43 is located between the outlet end of the cooling pipe 44 and the cooling component 42; when the inlet end of the cooling pipe 44 is connected to the heating outlet water pipe 62 via the second three-way solenoid valve 41, and the outlet end of the cooling pipe 44 is connected to the heating outlet water pipe 62, the one-way valve 43 is located between the outlet end of the cooling pipe 44 and the cooling component 42. In this embodiment, in addition to preventing the backflow of water from outside the cooling pipe 44, the one-way valve can also block the heat from the water flow from the heat exchange pipe when the heating mode is activated, preventing the heat from the water in the heat exchange pipe from being transferred to the cooling component 42.

[0054] Preferably, such as Figure 2 As shown, the cooling pipe 44 can also be installed on a branch of the heating outlet pipe 62. When the bathroom is closed, hot water can be transported from the heating outlet pipe 62 to the cooling pipe 44 via the second three-way solenoid valve 41, so that the hot water can be cooled by the cooling element 42. That is, the inlet end of the cooling pipe 44 is connected to the heating outlet pipe 62 via the second three-way solenoid valve 41, and the outlet pipe is connected to the heating outlet pipe 62, and the second three-way solenoid valve 41 is located at the end of the heating outlet pipe 62 near the heat exchange tube 11. The part of the cooling pipe 44 connected to the heating outlet pipe 62 can be connected by a three-way pipe, which can be set according to the requirements. The first three-way solenoid valve 3 is installed on the heating outlet pipe 62, and on the heating outlet pipe 62, the first three-way solenoid valve 3 is located after the second three-way solenoid valve 41, so as to ensure that after the bathroom is closed, the hot water first enters the cooling pipe 44 through the second three-way solenoid valve 41 for cooling. Similarly, a one-way valve 43 is located between the cooling element 42 and the second three-way solenoid valve 41 to prevent water in the cooling element 42 from flowing back into the heat exchange tube 11.

[0055] Preferably, the cooling component 42 is a water storage tank, in which cold water is placed to cool the hot water entering the cooling component 42. More preferably, the volume of the water storage tank is greater than 5L to ensure maximum cooling effect.

[0056] Preferably, a gas pipe 13 is installed at the bottom of the housing 1, and the gas pipe 13 is connected to the burner 12 for supplying external gas to the burner 12. An air outlet 14 is provided at the top of the housing 1 for discharging the gas generated inside the burner 12.

[0057] like Figure 1When the cooling pipe 44 shown is located as a branch pipe of the heating return water pipe 61: In summer, when heating is not required, the gas-fired heating water boiler is only in bathroom mode. When the bathroom is turned on, the heating outlet pipe 62 is connected to the first inlet end of the plate heat exchanger 5 through the first three-way solenoid valve 3. At the same time, the second outlet end and the second inlet end of the plate heat exchanger 5 are opened. Tap water enters the plate heat exchanger 5 through the tap water pipe, and under the action of the circulating water pump 2, the tap water is transported to the heat exchange tube 11 for heating. It then enters the plate heat exchanger 5 through the heating outlet pipe 62 and the first three-way solenoid valve 3, and then enters the bathroom outlet pipe 63 through the second outlet end of the plate heat exchanger 5 to realize bathroom water supply.

[0058] When the bathroom water supply is turned off, both the second inlet and the second outlet of the plate heat exchanger 5 are closed. At this time, the hot water from the heat exchange tube 11 will enter the plate heat exchanger 5 through the heating outlet pipe 62 and the first three-way solenoid valve 3. By controlling the second three-way solenoid valve 41, the heating return pipe 61 is connected to the cooling pipe 44. Under the action of the circulating water pump 2, the hot water in the plate heat exchanger 5 can be transported to the cooling pipe 44, and then to the cooling element 42 for cooling. This avoids the problem of hot water directly entering the heat exchange tube 11 through the heating pipe, which would cause the water temperature to be too high under the action of the waste heat of the burner 12, resulting in high-temperature water alarm and affecting the service life of the main heat exchanger.

[0059] Similarly, such as Figure 2 As shown, when the cooling pipe 44 is located on a branch pipe of the heating water outlet pipe 62, in summer, when heating is not required, the gas-fired heating water heater is only in bathroom mode. When the bathroom is turned on, the heat exchange pipe 11 is connected to the heating water outlet pipe 62 through the second three-way solenoid valve 41, and the heating water outlet pipe 62 is connected to the first inlet end of the plate heat exchanger 5 through the first three-way solenoid valve 3. The second outlet end and the second inlet end of the plate heat exchanger 5 are opened, and tap water enters the plate heat exchanger 5 through the tap water pipe. Under the action of the circulating water pump 2, the tap water is transported to the heat exchange pipe 11 for heating, and then enters the plate heat exchanger 5 through the heating water outlet pipe 62 and the first three-way solenoid valve 3. Finally, it enters the bathroom water outlet pipe 63 through the second outlet end of the plate heat exchanger 5 to realize bathroom water supply.

[0060] When the bathroom water supply is turned off, both the second inlet and the second outlet of the plate heat exchanger 5 are closed. The outlet of the heat exchange tube 11 is connected to the cooling pipe 44 via the second three-way solenoid valve 41. This allows the hot water in the heat exchange tube 11 to enter the cooling element 42 of the cooling pipe 44 for cooling, preventing hot water from re-entering the heat exchange tube 11 through the plate heat exchanger 5 and the heating return water pipe 61, which could cause high-temperature water, trigger an alarm, and affect the service life of the main heat exchanger. Simultaneously, the one-way valve 43 prevents water in the cooling element 42 of the cooling pipe 44 from flowing back into the heat exchange tube 11.

[0061] In addition, during winter, since the gas-fired heating and hot water boiler operates in a mode that combines heating and bathroom functions, when the bathroom is closed, the hot water in the heat exchange tube 11 will enter the heating outlet pipe 62 through the first three-way electric control valve 3 to form a heating cycle. Therefore, there will be no problem of hot water entering the heat exchange tube 11 and causing the water temperature to be too high.

[0062] Based on the gas-fired heating boiler provided by this invention, this invention also provides a control method for a gas-fired heating hot water boiler, specifically including the following steps:

[0063] When the cooling pipe 44 is located on a branch of the heating return water pipe 61:

[0064] Start-up steps: After the gas-fired heating and hot water boiler is connected to power and started, determine whether the gas-fired heating and hot water boiler is in bathroom mode. If so, execute the bathroom start-up steps.

[0065] In this invention, after the gas-fired heating and hot water boiler is started, it first determines whether it is in bathroom mode. If so, the cooling function needs to be activated. Conversely, if the gas-fired heating and hot water boiler is in both bathroom and heating mode, it will still be running even when the bathroom mode is turned off. Therefore, the problem of hot water entering the heat exchange tube 11 and generating high-temperature water will not occur. Thus, this invention only addresses the case where the gas-fired heating and hot water boiler is only in bathroom mode.

[0066] The bathroom start-up procedure involves opening both the second outlet and the second inlet of the plate heat exchanger 5, and using the circulating water pump 2 to transport the water in the heating return pipe 61 to the heat exchange pipe 11 for heating. At the same time, the heating return pipe 61 is connected to the plate heat exchanger 5 through the first three-way solenoid valve 3, so that the water in the heating return pipe 61 is transported to the plate heat exchanger 5, and then the water is delivered to the bathroom outlet pipe 63 through the second outlet of the plate heat exchanger 5.

[0067] Bathroom shutdown procedure: When the water supply to the bathroom stops, the second outlet and the second inlet of the plate heat exchanger 5 are closed. The heating return pipe 61 is connected to the cooling pipe 44 through the second three-way solenoid valve 41. Under the action of the circulating water pump 2, the hot water of the plate heat exchanger 5 is transported to the cooling pipe 44 and cooled in the cooling component 42.

[0068] This invention connects the heating return pipe 61 to the cooling pipe 44 via the second three-way electric control valve 41 when the bathroom water supply is stopped. This prevents the hot water in the plate heat exchanger 5 from entering the heat exchange tube 11 through the heating return pipe 61 and causing high temperature water alarm. Instead, the hot water is delivered to the cooling component 42 of the heating water pipe for cooling.

[0069] Similarly, when the cooling pipe 44 is located on a branch of the heating water outlet pipe 62: when the gas-fired heating hot water boiler is only in bathroom mode, the above-mentioned stop step is as follows: when the bathroom stops using water, the heating water outlet pipe 62 is connected to the cooling pipe 44 through the second three-way electric control valve 41, so that the hot water in the heating water outlet pipe 62 can directly enter the cooling pipe 44 for cooling, avoiding the problem of high-temperature water entering the heat exchange tube 11 after passing through the plate heat exchanger 5 and the heating return water pipe 61, causing high-temperature water and alarm.

[0070] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0071] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A combination gas fired water heating and space heating boiler, characterized in that, The application relates to a gas heating water heater, which comprises the following parts: a heating cycle pipeline, which is communicated with an external tap water pipeline and comprises a heating return water pipeline (61), a heat exchange pipeline (11) and a heating outlet water pipeline (62) connected in sequence; a heating device for heating the heating cycle pipeline; a plate heat exchanger (5), a first water inlet end of which is communicated with the heating outlet water pipeline (62) through a first three-way electric control valve (3), and a first water outlet end of which is communicated with the heating return water pipeline (61); the heating return water pipeline (61), the heat exchange pipeline (11), the heating outlet water pipeline (62) and the plate heat exchanger (5) form a bathroom cycle pipeline; a second water inlet end of the plate heat exchanger (5) is communicated with a bathroom water inlet pipeline (64), and a second water outlet end of the plate heat exchanger (5) is communicated with a bathroom water outlet pipeline (63); a circulating water pump (2) arranged on the bathroom cycle pipeline; a cooling device, which comprises a cooling pipeline (44), a second three-way electric control valve (41) and a cooling element (42); a water inlet end of the cooling pipeline (44) is communicated with the heating return water pipeline (61) through the second three-way electric control valve (41), a water outlet end of the cooling pipeline (44) is communicated with the heating return water pipeline (61), or the water inlet end of the cooling pipeline (44) is connected with the heating outlet water pipeline (62) through the second three-way electric control valve (41), and the water outlet end of the cooling pipeline (44) is communicated with the heating outlet water pipeline (62); the cooling element (42) is arranged on the cooling pipeline (44) and used for cooling water entering the cooling pipeline (44).

2. The combination as claimed in claim 1, wherein the gas-fired heating water heater is a combination of a gas-fired heating water heater and a gas-fired heating water heater. The cooling element (42) is a water storage tank.

3. The combination as claimed in claim 2, wherein the gas-fired heating water heater is a combination of a gas-fired heating water heater and a gas-fired heating water heater. The volume of the water storage tank is greater than 5L.

4. The combination as claimed in claim 3, wherein the gas-fired heating water heater is a combination of a gas-fired heating water heater and a gas-fired heating water heater. Cold water is contained in the water storage tank.

5. The combination as claimed in claim 1, wherein the gas heating water heater is a combination of a gas heating water heater and a gas heating system. The gas heating water heater further comprises a shell (1), the heating device comprises a burner (12) and a main heat exchanger arranged in the shell (1), the main heat exchanger has the heat exchange pipeline (11) and the heat exchange pipeline (11) is located above the burner (12).

6. The combination as claimed in claim 5, wherein the gas burner is a gas combi boiler. A gas pipeline (13) is arranged on the bottom of the shell (1) and connected with the burner (12) and used for conveying external gas to the burner (12); an air outlet (14) is arranged on the top of the shell (1).

7. The combination as claimed in claim 1, wherein the gas heating water heater is a combination of a gas heating water heater and a gas heating system. The circulating water pump (2) is arranged on the heating return water pipeline (61) and communicated with the second water outlet end of the plate heat exchanger (5).

8. The combination as claimed in claim 7, wherein the gas-fired heating water heater is a combination of a gas-fired heating water heater and a gas-fired heating water heater. When the water inlet end of the cooling pipeline (44) is communicated with the heating return water pipeline (61) through the second three-way electric control valve (41) and the water outlet end is communicated with the heating return water pipeline (61), the first water inlet end of the circulating water pump (2) is communicated with the plate heat exchanger (5), the second water inlet end of the circulating water pump (2) is communicated with the heating return water pipeline (61), and the water outlet end of the circulating water pump (2) is communicated with the second three-way electric control valve (41).

9. The combination as claimed in claim 1, wherein the gas fired water heating unit is a combination of a gas fired water heater and a gas fired space heating unit. The application further comprises a one-way valve (43), wherein the one-way valve (43) is arranged on the cooling pipeline (44), the water inlet of the one-way valve (43) is communicated with the water inlet end of the cooling pipeline (44), and the water outlet of the one-way valve (43) is communicated with the water outlet end of the cooling pipeline (44); When the water inlet end of the cooling pipeline (44) is communicated with the heating return water pipeline (61) through the second three-way electric control valve (41), and the water outlet end of the cooling pipeline (44) is communicated with the heating return water pipeline (61), the one-way valve (43) is arranged between the water outlet end of the cooling pipeline (44) and the cooling member (42); When the water inlet end of the cooling pipeline (44) is connected with the heating outlet water pipeline (62) through the second three-way electric control valve (41), and the water outlet end of the cooling pipeline (44) is communicated with the heating outlet water pipeline (62), the one-way valve (43) is arranged between the water outlet end of the cooling pipeline (44) and the cooling member (42).

10. A control method of a gas-fired heating water heater, applied to the gas-fired heating water heater of any one of claims 1-9, characterized in that, The control method comprises: The water heater starts step: when the gas heating water furnace is connected to the electricity and starts, it is judged whether the gas heating water furnace is in the bathroom mode, if yes, the bathroom starting step is executed; The bathroom starting step: the first three-way electric control valve (3) is used to connect the heating outlet water pipeline (62) with the first water inlet end of the plate heat exchanger (5), and the second water inlet end and the second water outlet end of the plate heat exchanger (5) are opened; the circulating water pump (2) is used to transport the water in the heating return water pipeline (61) to the heat exchange pipeline (11) of the main heat exchanger for heating; The bathroom stopping step: when the bathroom water stops, the second water outlet end and the second water inlet end of the plate heat exchanger (5) are closed; the second three-way electric control valve (41) is used to make the heating return water pipeline (61) communicated with the cooling pipeline (44), so that the hot water in the heat exchange pipeline (11) enters the cooling member (42) to cool, or the second three-way electric control valve (41) is used to make the heating outlet water pipeline (62) communicated with the cooling pipeline (44), so that the hot water in the heat exchange pipeline (11) enters the cooling member (42) to cool.

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