Gas water heater

Abstract

The utility model belongs to the technical field of water heaters, and particularly discloses a gas water heater which comprises a water inlet pipe, a heat exchanger and a water outlet pipe which are sequentially communicated in the water flow direction, and further comprises a water mixing tank and a bypass pipe, the water mixing tank is arranged on the water outlet pipe, and a water inlet, a bypass water inlet and a water outlet are formed in the water mixing tank. The water inlet is used for being communicated with the water outlet end of the heat exchanger, the water outlet is communicated with the water using end through the water outlet pipe, the two ends of the bypass pipe are communicated with the bypass water inlet and the water inlet pipe respectively, a bypass valve used for adjusting the water flow is arranged on the bypass pipe, and the vertical distance H1 between the bypass water inlet and the water inlet is larger than the vertical distance H2 between the bypass water inlet and the water outlet. According to the gas water heater disclosed by the utility model, on the basis of solving the problem of water stop temperature rise during secondary starting, the outlet water temperature in the water stop temperature drop stage can be improved, and the structure of the water mixing tank is simplified while the water stop temperature drop is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water heater technical field especially relates to gas water heater. BACKGROUND

[0002] The gas water heater is the heating equipment that the high temperature flue gas produced by the combustion of gas in the burner and the water in the heat exchanger are heated through heat exchange, and then realize hot water output. The existing gas water heater includes water inlet pipe, heat exchanger and water outlet pipe which are communicated in sequence. The cold water of water inlet enters the heat exchanger and exchanges heat with the heat exchanger, and the hot water after heating is discharged from the water outlet for user to use.

[0003] In the process of using the gas water heater, the user may encounter the situation of needing to pause water output and close the gas water heater. When the water heater is extinguished, the water in the heat exchanger is in a static state, so it is continuously heated by the residual heat of the heat exchanger, resulting in the water temperature rising higher than the set water temperature. When the gas water heater is started again, the high-temperature water heated by the residual heat of the heat exchanger flows out through the water outlet pipe, making the water temperature significantly higher than the set water temperature and forming a water temperature rise. Then, the cold water newly flowing into the water inlet pipe flows through the heat exchanger and flows out without being fully heated, making the water temperature significantly lower than the set water temperature and forming a water temperature drop. Therefore, when the user starts the gas water heater again, the problems of excessively high water temperature and excessively low water temperature may occur in succession. Especially when the user starts the gas water heater again, the gas water heater usually ignites to heat the heat exchanger after detecting a certain water flow in the water inlet pipe, so there is a time difference between the water inlet of the water inlet pipe and the start of the burner. The situation of excessively low water temperature may last for a long time, which greatly affects the user's experience. SUMMARY

[0004] The utility model solves the technical problem to provide a kind of gas water heater, it can solve the problem that the existing gas water heater appears in succession when starting again that water temperature is too high and water temperature is too low, and the situation of water temperature being too low can last for a long time, which greatly affects the user's experience.

[0005] The second technical problem solved by the utility model is to provide a gas stove with a water mixing tank that can maintain the flatness and aesthetics of the panel, prevent water from entering through the gap and cause malfunctions, and facilitate the disassembly and maintenance of the panel, improving the user's experience.

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

[0007] The application provides a gas water heater, which comprises a water inlet pipe, a heat exchanger and a water outlet pipe which are sequentially connected in a water flow direction, a water mixing tank and a bypass pipe, the water mixing tank is arranged on the water outlet pipe, the water mixing tank is provided with a water inlet, a bypass water inlet and a water outlet, the water inlet is used for connecting a water outlet end of the heat exchanger, the water outlet is connected with a water end through the water outlet pipe, the bypass pipe is connected with the bypass water inlet and the water inlet pipe respectively, and a bypass valve for adjusting water flow is arranged on the bypass pipe, wherein the vertical distance between the bypass water inlet and the water inlet is H1, the vertical distance between the bypass water inlet and the water outlet is H2, and H1>H2.

[0008] Compared with the background art, the gas water heater has the beneficial effects that: the water mixing tank is arranged at the outlet end of the heat exchanger, and the bypass pipe with the flow adjusting bypass valve is arranged between the water mixing tank and the water inlet pipe, in the scene of temporarily closing and restarting the gas water heater, the valve opening degree is adjusted to be large, part of the water flow in the water inlet pipe is divided to flow to the water outlet pipe through the bypass pipe, meanwhile, another part of the water flow flows into the heat exchanger from the water inlet pipe, thus, the high-temperature water remaining in the heat exchanger flows into the water mixing tank and mixes with the cold water in the bypass pipe, the high-temperature water generated due to the residual heat in the heat exchanger after the short stop is neutralized, and the water temperature rise during the stop is reduced; meanwhile, during the process of starting the burner to normal heating, the water flow flowing to the heat exchanger through the water inlet pipe is reduced due to the division, in order to ensure that the water outlet temperature is unchanged, the water flow in the heat exchanger is heated to a higher temperature, compared with the prior art without the bypass pipe, more heat energy can be stored, the water mixing tank is arranged downstream of the heat exchanger, the vertical distance H1 between the bypass water inlet and the water inlet is greater than the vertical distance H2 between the bypass water inlet and the water outlet, the area above the bypass water inlet is equivalent to an energy storage expansion unit of the heat exchanger, thus, by limiting the two distance values, the energy storage space above can be increased, the heat exchanger and the water mixing tank can store more energy, the bypass valve can be adjusted to be small or closed through time delay, the cold water generated before the burner is heated during normal heating is neutralized, and the water temperature drop during the stop is reduced; due to the energy storage expansion effect of the water mixing tank, the heat exchange volume requirement of the heat exchanger is effectively reduced, and the compactness and small size of the heat exchanger are beneficial; by limiting the distance difference between the bypass water inlet, the water inlet and the water outlet, the energy storage space of the water mixing tank can be increased, the basic water mixing function can be ensured, the water mixing tank structure is simplified, the structural materials of the water mixing tank are reduced, and no additional flow resistance structure needs to be arranged.

[0009] In one of the embodiments, the ratio of H1 to H2 is greater than or equal to 2:1.

[0010] In one of the embodiments, a partition plate is arranged in the water mixing tank to divide the internal space into an energy storage mixing area and a drainage area, the partition plate is provided with flow guide holes to communicate the energy storage mixing area and the drainage area, the volume of the energy storage mixing area is greater than that of the drainage area, the water inlet and the bypass water inlet are arranged in the energy storage mixing area, and the water outlet is arranged in the drainage area.

[0011] In one of the embodiments, the volume ratio of the energy storage mixing area to the drainage area is greater than or equal to 3:1.

[0012] In one of the embodiments, the partition plate is provided with a plurality of flow guide holes, and the plurality of flow guide holes are arranged uniformly.

[0013] In one of the embodiments, the bypass valve is a water proportional valve with adjustable opening degree.

[0014] In one of the embodiments, the bypass valve is a three-way water proportional valve, the three-way water proportional valve has one inlet end and two outlet ends, the inlet end and one of the outlet ends are connected with the water inlet pipe, and the other outlet end is connected with the bypass pipe.

[0015] In one of the embodiments, the bypass valve is an on-off valve, at least one branch pipe is further arranged on the bypass pipe, at least two on-off valves are arranged in series on the bypass pipe, and the branch pipe is connected in parallel with one of the on-off valves; or, the bypass valve is an on-off valve, at least two on-off valves are arranged on the bypass pipe, and all the on-off valves are connected in parallel.

[0016] In one of the embodiments, the gas water heater further comprises a water inlet temperature sensor and / or a heat exchange outlet water temperature sensor, the water inlet temperature sensor is arranged on the water inlet pipe, and the water inlet temperature sensor is communicatively connected to the controller; and / or,

[0017] The gas water heater further comprises a heat exchange outlet water temperature sensor, the heat exchange outlet water temperature sensor is arranged between the heat exchanger and the water mixing tank, and the heat exchange outlet water temperature sensor is communicatively connected to the controller.

[0018] In one of the embodiments, the gas water heater further comprises an outlet water temperature sensor, the outlet water temperature sensor is arranged downstream of the water mixing tank, and the outlet water temperature sensor is communicatively connected to the controller. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure schematic diagram of the gas water heater provided by the first embodiment of the utility model;

[0020] Figure 2 A structure schematic diagram of the gas water heater provided by the second embodiment of the utility model;

[0021] Figure 3 A structure schematic view of the gas water heater is provided for the third embodiment of the present application.

[0022] Figure 4 A structure schematic view of the gas water heater is provided for the fourth embodiment of the present application.

[0023] Label explanation:

[0024] 1, water inlet pipe; 2, heat exchanger; 3, water outlet pipe; 4, mixed water tank; 41, water inlet; 42, bypass water inlet; 43, water outlet; 44, energy storage mixing area; 45, drainage area; 46, partition plate; 5, bypass pipe; 6, bypass valve; 61, three-way water proportional valve; 62, branch pipe; 63, on-off valve; 71, water inlet temperature sensor; 72, water inlet flow sensor; 8, heat exchange water outlet temperature sensor; 9, water outlet temperature sensor. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] The terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] Embodiment one

[0030] As Figure 1 shown, the utility model embodiment provides a gas water heater, gas water heater is used to solve the existing gas water heater in secondary start will appear in turn water temperature is too high and water temperature is too low, and water temperature is too low The condition will last for a long time, greatly influence user experience problem.

[0031] The gas water heater comprises a water inlet pipe 1, a heat exchanger 2 and a water outlet pipe 3 communicated in sequence along the water flow direction. Among them, the water inlet pipe 1 is used to connect the water supply end, the water inlet pipe 1 flows for the cold water provided by the water supply end, the cold water flows into the heat exchanger 2 to realize heat exchange and temperature rise, and the hot water flows from the water outlet pipe 3 to the water end for user use. The gas water heater further comprises a water mixing tank 4 and a bypass pipe 5, the water mixing tank 4 is arranged on the water outlet pipe 3, the water mixing tank 4 is provided with a water inlet 41, a bypass water inlet 42 and a water outlet 43, the water inlet 41 is used to communicate the water outlet end of the heat exchanger 2, and the water outlet 43 is communicated with the water end through the water outlet pipe 3. The two ends of the bypass pipe 5 are communicated with the bypass water inlet 42 and the water inlet pipe 1 respectively, and the bypass valve 6 for adjusting water flow is arranged on the bypass pipe 5. The water mixing tank 4 is a tank body with a certain volume, the hot water flowing out of the heat exchanger 2 and the cold water flowing out of the bypass pipe 5 are mixed in the water mixing tank 4, to form warm water meeting user demand and flow to the water end through the water outlet pipe 3. Along the water flow direction, the vertical distance between the bypass water inlet 42 and the water inlet 41 is H1, and the vertical distance between the bypass water inlet 42 and the water outlet 43 is H2, and H1 is greater than H2.

[0032] By setting the water mixing tank 4 at the outlet end of the heat exchanger 2, and setting the bypass pipe 5 with the flow regulating bypass valve 6 between the water mixing tank 4 and the water inlet pipe 1, in the scenario of short-term shutdown and secondary start of the gas water heater, the valve opening is adjusted to increase, part of the water flow in the water inlet pipe 1 is diverted to flow to the water outlet pipe 3 from the bypass pipe 5, and the other part of the water flow flows from the water inlet pipe 1 into the heat exchanger 2, thereby the high-temperature water remaining in the heat exchanger 2 flows into the water mixing tank 4 and mixes with the cold water in the bypass pipe 5 to neutralize the high-temperature water in the heat exchanger 2 due to residual heat after short shutdown, and to reduce the water temperature rise during shutdown; at the same time, during the normal heating process of the burner, the water flow from the water inlet pipe 1 to the heat exchanger 2 is reduced due to diversion, in order to ensure that the outlet water temperature remains unchanged, the water flow in the heat exchanger 2 will be heated to a higher temperature, compared with the prior art without the bypass pipe 5, more heat energy can be stored, and because the water mixing tank 4 is set downstream of the heat exchanger 2, and the vertical distance H1 between the bypass water inlet 42 and the water inlet 41 is greater than the vertical distance between the bypass water inlet 42 and the water outlet 43, and the area above the bypass water inlet 42 is equivalent to the energy storage expansion unit of the heat exchanger 2, therefore by limiting the size of the two distances, the energy storage space above can be increased, and the heat exchanger 2 and the water mixing tank 4 can obtain more energy storage, which is convenient for neutralizing the cold water that the burner has not had time to heat before normal heating by adjusting or closing the bypass valve 6 in a delayed manner, and to reduce the water temperature drop during shutdown. Due to the energy storage expansion effect of the water mixing tank 4, the gas water heater of the embodiment effectively reduces the demand for heat exchange volume of the heat exchanger 2, which is beneficial to the compactness and miniaturization of the heat exchanger 2; by limiting the distance difference between the bypass water inlet 42 and the water inlet 41 and the water outlet 43, the energy storage space of the water mixing tank 4 can be increased, while the basic water mixing function is ensured, the water mixing tank 4 structure is simplified, the structure material of the water mixing tank 4 is reduced, and no additional flow resistance structure needs to be set.

[0033] Specifically, the ratio of the vertical distance H1 between the bypass water inlet 42 and the water inlet 41 to the vertical distance H2 between the bypass water inlet 42 and the water outlet 43 is greater than or equal to 2:1. Exemplarily, Figure 1 H1 is the vertical distance between the bypass water inlet 42 and the water inlet 41, and H2 is the vertical distance between the bypass water inlet 42 and the water outlet 43. In the embodiment, the ratio of the vertical distance H1 between the bypass water inlet 42 and the water inlet 41 to the vertical distance H2 between the bypass water inlet 42 and the water outlet 43 is 3:1. On the one hand, the cold water entering the bypass water inlet 42 can form flow resistance to the hot water between the bypass water inlet 42 and the water inlet 41, and on the other hand, the cold water entering the bypass water inlet 42 can be fully mixed with the hot water between the bypass water inlet 42 and the water outlet 43. In other embodiments, the ratio of the vertical distance H1 between the bypass water inlet 42 and the water inlet 41 to the vertical distance H2 between the bypass water inlet 42 and the water outlet 43 can be 4:1, or 4.5:1, 5:1, etc.

[0034] In the embodiment, the water mixing tank 4 is provided with a partition plate 46, which divides the internal space of the water mixing tank 4 into an energy storage mixing area 44 and a drainage area 45. The partition plate 46 is provided with flow guide holes to communicate the energy storage mixing area 44 and the drainage area 45. The volume of the energy storage mixing area 44 is greater than that of the drainage area 45. The water inlet 41 and the bypass water inlet 42 are arranged in the energy storage mixing area 44, and the water outlet 43 is arranged in the drainage area 45. Through the arrangement of the baffle, the mixed water formed in the energy storage mixing area 44 is accelerated in the process of entering the drainage area 45 through the flow guide holes, and the flow rate is relatively large and forms a turbulent effect, further improving the mixing effect of hot water and cold water, so that the water temperature of the water outlet 43 is more stable. Moreover, the partition plate 46 has a flow blocking effect at the same time, preventing the rapid loss of hot water in the water mixing tank 4 during the secondary start of the gas water heater, and gradually mixing the hot water in the water mixing tank 4 with cold water to improve the problem of water temperature drop during shutdown. The volume of the energy storage mixing area 44 is greater than that of the drainage area 45, which ensures that the energy storage mixing area 44 has sufficient volume for energy storage during the shutdown of the gas water heater.

[0035] Optionally, the volume of the energy storage mixing area 44 and the drainage area 45 is greater than or equal to 3:1. In the embodiment, the volume ratio of the energy storage mixing area 44 and the drainage area 45 is 3:1. In other embodiments, the volume ratio of the energy storage mixing area 44 and the drainage area 45 can be 4:1, or 5:1, 7:1, etc.

[0036] In order to further improve the turbulent effect of the partition plate 46, the partition plate 46 is provided with a plurality of flow guide holes, which are uniformly arranged. The shape and number of the flow guide holes are not limited in the embodiment.

[0037] The bypass valve 6 is a water proportional valve with adjustable opening. By adjusting the opening of the water proportional valve, the flow of the bypass pipe 5 is steplessly adjusted, and the bypass ratio of the bypass pipe 5 has a larger adjustment range and higher adjustment accuracy.

[0038] The gas water heater is also provided with a water inlet temperature sensor 71 arranged in the water inlet pipe 1 for measuring the temperature of the cold water in the water inlet pipe 1. The water inlet temperature sensor 71 is communicatively connected to the controller and transmits the detected temperature of the cold water in the water inlet pipe 1 to the controller.

[0039] The gas water heater is also provided with a heat exchange outlet water temperature sensor 8, which is arranged between the heat exchanger 2 and the mixing tank 4. The heat exchange outlet water temperature sensor 8 is used to measure the temperature of the hot water flowing out of the heat exchanger 2, and is communicatively connected to the controller and transmits the detected temperature value to the controller. According to the measured value of the inlet water temperature sensor 71 and the user-set water temperature, the controller can adjust the set outlet water temperature of the heat exchanger 2. According to the set outlet water temperature of the heat exchanger 2 and the actual outlet water temperature of the heat exchanger 2 detected by the heat exchange outlet water temperature sensor 8, the opening of the bypass valve 6 can be adjusted to adapt to the change of the outlet water temperature of the heat exchanger 2, so that the actual outlet water temperature of the outlet water pipe 3 meets the user-set water temperature requirement.

[0040] Optionally, the gas water heater is also provided with an outlet water temperature sensor 9 arranged downstream of the mixing tank 4, which is communicatively connected to the controller. The outlet water temperature sensor 9 detects the actual outlet water temperature of the outlet water pipe 3, and the controller compares the detected actual outlet water temperature with the user-set water temperature, thereby adjusting the opening of the bypass valve 6 so that the actual outlet water temperature of the outlet water pipe 3 is closer to the user-set water temperature, further improving the user's experience.

[0041] The inlet water pipe 1 is provided with an inlet water flow sensor 72 for sensing whether there is water flow in the inlet water pipe 1, which is communicatively connected to the controller. The controller controls the opening and closing of the burner (not shown in the figure) according to the transmission signal of the inlet water flow sensor 72. The burner starts to work only after cold water flows through the inlet water pipe 1, thereby improving safety and avoiding overheating of the heat exchanger 2.

[0042] Embodiment Two

[0043] In this embodiment, a gas water heater is provided, and the basic structure of the gas water heater provided in this embodiment is the same as that of Embodiment One, only the arrangement structure of the bypass valve 6 is different. This embodiment will not repeat the same structures of the above-mentioned embodiments.

[0044] In this embodiment, as shown in Figure 2 The bypass valve 6 is a three-way water proportional valve 61, which has one inlet end and two outlet ends. The inlet end and one of the outlet ends are connected to the inlet water pipe 1, and the other outlet end is connected to the bypass pipe 5. That is, the three-way water proportional valve 61 is arranged at the communication position of the bypass pipe 5 and the inlet water pipe 1. Through the three-way water proportional valve 61, the cold water flow into the mixing tank 4 and the heat exchanger 2 can be steplessly adjusted, respectively.

[0045] Embodiment Three

[0046] In the embodiment, a gas water heater is provided, and the basic structure of the gas water heater provided in the embodiment is the same as that of the first embodiment, and only the arrangement structure of the bypass valve 6 is different. The same structures of the above embodiments will not be described herein again.

[0047] In the embodiment, as shown in Figure 3 , the bypass valve 6 is a switch valve 63, and at least one branch pipe 62 is further arranged on the bypass pipe 5, and at least two switch valves 63 are arranged in series on the bypass pipe 5, and the branch pipe 62 is connected in parallel with one of the switch valves 63. For example, as shown in Figure 3 , two switch valves 63 and one branch pipe 62 are arranged on the bypass pipe 5, the two switch valves 63 are connected in series, and the branch pipe 62 is connected in parallel with one of the switch valves 63 located upstream. When the two switch valves 63 are opened at the same time, the flow rate of the bypass pipe 5 inputting the mixing water tank 4 is the flow rate of the water inlet pipe 1 inputting the bypass pipe 5; when the switch valve 63 connected in parallel with the branch pipe 62 is closed, the flow rate of the bypass pipe 5 inputting the mixing water tank 4 is the flow rate of the downstream switch valve 63; and when the switch valve 63 located downstream is closed, the flow rate of the bypass pipe 5 inputting the mixing water tank 4 is 0. That is, three-grade flow rate adjustment can be realized.

[0048] Embodiment Four

[0049] In the embodiment, a gas water heater is provided, and the basic structure of the gas water heater provided in the embodiment is the same as that of the first embodiment, and only the arrangement structure of the bypass valve 6 is different. The same structures of the above embodiments will not be described herein again.

[0050] In the embodiment, as shown in Figure 4 , the bypass valve 6 is a switch valve 63, and at least two switch valves 63 are arranged on the bypass pipe 5, and all the switch valves 63 are connected in parallel. For example, as shown in Figure 4 , two switch valves 63 connected in parallel are arranged on the bypass pipe 5. The flow rates of the two switch valves 63 are the same, when the two switch valves 63 are opened at the same time, the flow rate of the bypass pipe 5 inputting the mixing water tank 4 is the flow rate of the water inlet pipe 1 inputting the bypass pipe 5; when one of the switch valves 63 is opened and the other switch valve 63 is closed, the flow rate of the bypass pipe 5 inputting the mixing water tank 4 is the flow rate of the one switch valve 63; and when the two switch valves 63 are closed at the same time, the flow rate of the bypass pipe 5 inputting the mixing water tank 4 is 0. That is, three-grade flow rate adjustment can be realized.

[0051] In other embodiments, the at least two switch valves 63 connected in parallel can be switch valves 63 with different flow rates, so that more-grade flow rate adjustment modes can be realized.

[0052] In the specific contents of the foregoing specific embodiments, each technical feature can be combined arbitrarily without contradiction, and to make the description brief, all possible combinations of the foregoing technical features are not described, however, as long as the combinations of the technical features do not exist contradiction, it should be considered that it is within the scope of the description.

[0053] The specific contents of the foregoing specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A gas water heater comprising a water inlet pipe (1), a heat exchanger (2) and a water outlet pipe (3) connected in sequence along the direction of water flow, characterized in that, The gas water heater further comprises a water mixing tank (4) and a bypass pipe (5), the water mixing tank (4) is arranged on the water outlet pipe (3), the water mixing tank (4) is provided with a water inlet (41), a bypass water inlet (42) and a water outlet (43), the water inlet (41) is used for connecting the water outlet end of the heat exchanger (2), the water outlet (43) is connected to the water end through the water outlet pipe (3), the two ends of the bypass pipe (5) are connected to the bypass water inlet (42) and the water inlet pipe (1) respectively, the bypass pipe (5) is provided with a bypass valve (6) for adjusting the water flow, wherein the vertical distance between the bypass water inlet (42) and the water inlet (41) is H1, the vertical distance between the bypass water inlet (42) and the water outlet (43) is H2, H1>H2.

2. The gas water heater of claim 1, wherein, The ratio of H1 to H2 is greater than or equal to 2:

1.

3. The gas water heater of claim 1, wherein, The water mixing tank (4) is provided with a partition plate (46) to divide the internal space into an energy storage mixing area (44) and a drainage area (45), the partition plate (46) is provided with a flow guide hole to connect the energy storage mixing area (44) and the drainage area (45), the volume of the energy storage mixing area (44) is greater than that of the drainage area (45), the water inlet (41) and the bypass water inlet (42) are arranged in the energy storage mixing area (44), and the water outlet (43) is arranged in the drainage area (45).

4. The gas water heater of claim 3, wherein, The volume ratio of the energy storage mixing area (44) to the drainage area (45) is greater than or equal to 3:

1.

5. The gas water heater of claim 3, wherein, The partition plate (46) is provided with a plurality of flow guide holes arranged uniformly.

6. The gas water heater of claim 1, wherein, The bypass valve (6) is a water proportional valve with adjustable opening degree.

7. The gas water heater of claim 1, wherein, The bypass valve (6) is a three-way water proportional valve (61), the three-way water proportional valve (61) has one inlet end and two outlet ends, the inlet end and one of the outlet ends are connected to the water inlet pipe (1), and the other outlet end is connected to the bypass pipe (5).

8. The gas water heater of claim 1, wherein, The bypass valve (6) is a switch valve (63), at least one branch pipe (62) is further arranged on the bypass pipe (5), at least two switch valves (63) are arranged in series on the bypass pipe (5), and the branch pipe (62) is connected in parallel with one of the switch valves (63); or, the bypass valve (6) is a switch valve (63), at least two switch valves (63) are arranged on the bypass pipe (5), and all the switch valves (63) are connected in parallel.

9. The gas water heater according to any one of claims 1 to 8, wherein, The gas water heater further comprises a water inlet temperature sensor (71), the water inlet temperature sensor (71) is arranged on the water inlet pipe (1), and the water inlet temperature sensor (71) is communicatively connected to the controller; and / or, The gas water heater further comprises a heat exchange outlet water temperature sensor (8), the heat exchange outlet water temperature sensor (8) is arranged between the heat exchanger (2) and the water mixing tank (4), and the heat exchange outlet water temperature sensor (8) is communicatively connected to the controller.

10. The gas water heater according to any one of claims 1 to 8, wherein, The gas water heater further comprises a water outlet temperature sensor (9) arranged downstream of the water mixing tank (4), and the water outlet temperature sensor (9) is communicatively connected to the controller.

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