Gas water heater

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a gas water heater. The gas water heater comprises a heat exchanger, a cold water inlet pipe and a hot water outlet pipe which are sequentially connected, and further comprises a three-way reversing valve, a drainage pipe, a bypass pipe and a switching valve. The three-way reversing valve controls the second valve port to be communicated with the first valve port or the third valve port; the upper end of the drainage pipe is connected to the third valve port; the bypass pipe is connected between the drainage pipe and the hot water outlet pipe, an intersection port is formed in the joint of the bypass pipe and the drainage pipe, and the third valve port, the intersection port and the drainage port are sequentially arranged from top to bottom; the switch valve is arranged on the bypass pipe and used for controlling the on-off of the bypass pipe; and the controller is in communication connection with the three-way reversing valve and the switch valve. According to the gas water heater, the drainage effect of the gas water heater can be improved, and the anti-freezing performance is improved.

Description

Technical Field

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

[0002] After the gas water heater is used, there will be residual water in the water inlet and outlet pipes and the heat exchanger. When the temperature is low in winter, the residual water will easily freeze and cause the pipes to crack. At the very least, it will affect the service life of the heat exchanger. At worst, it will cause the heat exchanger or even the entire gas water heater to need to be replaced.

[0003] A gas water heater is provided in the prior art, which includes a heat exchanger, a cold water inlet pipe connected to the water inlet end of the heat exchanger, and a hot water pipe connected to the water outlet end of the heat exchanger. The cold water inlet pipe is provided with an inlet switch valve upstream of the bypass pipe, the bypass pipe is provided with a bypass switch valve, the bypass switch valve is provided between the drain pipe and the cold water inlet pipe, and the drain pipe is provided with a drain valve. When the gas water heater supplies hot water, the inlet switch valve is opened, the bypass switch valve and the drain valve are closed, so that the cold water enters the heat exchanger through the cold water inlet pipe and is heated to form hot water, and the hot water flows out to the water use end through the hot water pipe; when antifreeze is required, the inlet switch valve is disconnected, the bypass switch valve and the drain valve are opened, so that part of the water in the heat exchanger can enter the bypass pipe and then be discharged through the drain pipe.

[0004] Although the gas water heater provided by the prior art can achieve drainage and anti-freezing, when the stored water enters the bypass pipe through the hot water pipe and the cold water inlet pipe and then is discharged from the drain pipe, it is easy for the remaining water to be difficult to drain due to water tension and internal pressure problems of the pipe during the discharge process, thereby affecting the heat exchange effect of the gas water heater. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a gas water heater, which can effectively solve the technical problem that the residual water in the existing gas water heater is difficult to be completely discharged, improve the drainage smoothness of the gas water heater, and improve the antifreeze performance of the gas water heater.

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

[0007] A gas water heater comprises a heat exchanger, a cold water inlet pipe connected to the water inlet end of the heat exchanger and a hot water outlet pipe connected to the water outlet end of the heat exchanger, and the gas water heater further comprises:

[0008] A three-way reversing valve having a first valve port, a second valve port and a third valve port, wherein the first valve port and the second valve port are connected in series to the cold water inlet pipe, and the first valve port is located upstream of the second valve port, and the three-way reversing valve controls the second valve port to be connected to the first valve port or the third valve port;

[0009] A drain pipe, the upper end of which is connected to the third valve port and the lower end of which forms a drain port;

[0010] A bypass pipe is connected between the drain pipe and the hot water outlet pipe, a junction is formed at the connection between the bypass pipe and the drain pipe, and the third valve port, the junction and the drain port are arranged in sequence from top to bottom;

[0011] A switch valve, which is arranged in the bypass pipe and used to control the on-off of the bypass pipe, or is arranged between the drain port and the junction port and used to control the on-off of the drain pipe;

[0012] The controller is communicatively connected with the three-way reversing valve and the switch valve.

[0013] Compared with the background technology, the gas water heater of the utility model has the following beneficial effects: by setting the three-way reversing valve, the switch valve, the drain pipe and the bypass pipe, the gas water heater can be automatically switched between the normal working mode and the drain mode, so that when the gas water heater needs to be anti-freeze, the gas water heater is automatically switched to the drain mode to reduce the water in the heat exchanger and its associated pipelines, and reduce the probability of the heat exchanger being cracked due to freezing; because the third valve port, the intersection port and the drain port are arranged in sequence from top to bottom, the gas water heater is In the drainage mode, the water flowing downward from the third valve port to the intersection impacts the water flowing from the bypass pipe to the intersection, thereby destroying the tension of the water at the intersection, so that the two water flows can flow smoothly through the intersection to the drain port below. At the same time, the external air can also flow upward to the cold water inlet pipe after passing through the drain port, the intersection and the third valve port in sequence under the negative pressure formed by the water flow, thereby balancing the pressure in the pipeline, better facilitating the drainage of the remaining water, improving the drainage effect, and thus improving the antifreeze effect of the gas water heater.

[0014] In one embodiment, the connection position between the bypass pipe and the hot water outlet pipe forms a bypass connection position, and a one-way fluid switch is provided on the hot water outlet pipe. The one-way fluid switch is located downstream of the bypass connection position and is used to detect whether there is water flowing at the water outlet end of the hot water outlet pipe. The one-way fluid switch is communicatively connected to the controller.

[0015] In one of the embodiments, the gas water heater further includes an antifreeze temperature sensor, which is disposed at the heat exchanger and is used to detect the temperature at the heat exchanger, and the antifreeze temperature sensor is communicatively connected to the controller.

[0016] In one of the embodiments, the controller is connected to the mains via a power supply connector, and the gas water heater further comprises a battery, which is electrically connected to the controller, and the battery is used to supply power to the controller.

[0017] In one embodiment, the storage battery is a capacitor battery.

[0018] In one embodiment, the switch valve and the three-way reversing valve are both solenoid valves.

[0019] In one embodiment, the drain pipe, the three-way reversing valve, the switch valve and the bypass pipe are all located outside the casing of the gas water heater.

[0020] In one embodiment, the three-way reversing valve, the switch valve and the bypass pipe are located inside the casing of the gas water heater, and the drain outlet of the drain pipe extends downwardly out of the casing.

[0021] In one embodiment, the gas water heater includes a wireless communication module, and the wireless communication module is communicatively connected to the controller.

[0022] In one of the embodiments, a water flow sensor is provided on the cold water inlet pipe, and the water flow sensor is communicatively connected with the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a gas water heater provided in Embodiment 1 of the utility model;

[0024] Figure 2 A schematic diagram of the structure of a gas water heater provided in Embodiment 2 of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of a gas water heater provided in Embodiment 3 of the present utility model.

[0026] Description of labels:

[0027] 1. Cold water inlet pipe; 11. First cold water pipe section; 12. Second cold water pipe section; 2. Hot water outlet pipe; 21. First hot water pipe section; 22. Second hot water pipe section; 3. Heat exchanger; 4. Three-way reversing valve; 4A. First valve port; 4B. Second valve port; 4C. Third valve port; 5. Drain pipe; 6. Bypass pipe; 7. Switch valve; 8. Controller; 9. Battery; 10. Antifreeze temperature sensor; 20. One-way fluid switch; 30. Water flow sensor; 40. Casing; 50. Power supply connector; 60. Wireless communication module;

[0028] E. Intersection; F. Bypass connection location. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] Embodiment 1

[0034] like Figure 1 As shown, this embodiment provides a gas water heater, which includes a housing 40, a heat exchanger 3, a combustion assembly, a cold water inlet pipe 1, a hot water outlet pipe 2, and a controller 8. The heat exchanger 3 and the combustion assembly are both located inside the housing 40, and the cold water inlet pipe 1 is connected to the water inlet end of the heat exchanger 3, and the hot water outlet pipe 2 is connected to the water outlet end of the heat exchanger 3; the combustion assembly is used to generate high-temperature flue gas by combustion, so that the high-temperature flue gas heats the water flowing through the heat exchanger 3 when flowing through the heat exchanger 3 to generate hot water, and the hot water is supplied to the water use end through the hot water outlet pipe 2; the controller 8 is connected to the combustion assembly in communication to control the opening and closing of the gas water heater and the heating power.

[0035] In this embodiment, the gas water heater further comprises a three-way reversing valve 4, a drain pipe 5, a switch valve 7 and a bypass pipe 6. The three-way reversing valve 4 has a first valve port 4A, a second valve port 4B and a third valve port 4C. The first valve port 4A and the second valve port 4B are connected in series to the cold water inlet pipe 1, and the first valve port 4A is located upstream of the second valve port 4B. The three-way reversing valve 4 controls the second valve port 4B to selectively communicate with the first valve port 4A or the third valve port 4C; the upper end of the drain pipe 5 is connected to the third valve port 4C, and the lower end of the drain pipe 5 forms a drain port; the bypass pipe 6 is connected between the drain pipe 5 and the hot water outlet pipe 2, and the junction E is formed at the junction of the bypass pipe 6 and the drain pipe 5, and the third valve port 4C, the junction E and the drain port are arranged in sequence from top to bottom; the switch valve 7 is arranged on the bypass pipe 6 and used to control the on-off of the bypass pipe 6, or the switch valve 7 is arranged between the drain port and the junction E and used to control the on-off of the drain pipe 5. The switch valve 7 and the three-way reversing valve 4 are both communicatively connected to the controller 8 .

[0036] For the convenience of description, the pipe section of the cold water inlet pipe 1 between the water inlet end of the cold water inlet pipe 1 and the first valve port 4A is called the first cold water pipe section 11, and the pipe section of the cold water inlet pipe 1 between the second valve port 4B and the heat exchanger 3 is called the second cold water pipe section 12. The bypass connection position F is formed at the connection between the bypass pipe 6 and the hot water outlet pipe 2, the portion of the hot water outlet pipe 2 located upstream of the bypass connection position F is called the first hot water pipe section 21, and the portion of the hot water outlet pipe 2 located downstream of the bypass connection position F is called the second hot water pipe section 22.

[0037] The gas water heater provided in this embodiment has a normal working mode and a drainage mode by setting a three-way reversing valve 4 and a switch valve 7: when the gas water heater is in the normal working mode, the first valve port 4A and the second valve port 4B are connected, the third valve port 4C is disconnected from the first valve port 4A and the second valve port 4B, the bypass pipe 6 is disconnected, and cold water can enter the heat exchanger 3 through the cold water inlet pipe 1 and be heated, and then flow out from the hot water outlet pipe 2 to realize normal heating of the gas water heater; when the gas water heater is in the drainage mode, the first valve port 4A and the third valve port 4C are connected. The second valve port 4B is disconnected, the second valve port 4B is connected to the third valve port 4C, and the switch valve 7 is opened to make the bypass pipe 6 or the drain pipe 5 conductive, so that the remaining water in the second cold water pipe section 12 can be discharged through the second cold water pipe section 12, the three-way reversing valve 4 and the drain pipe 5 in sequence, and the remaining water in the first hot water pipe section 21 can be discharged through the first hot water pipe section 21, the bypass pipe 6 and the drain pipe 5 in sequence, and the remaining water in the heat exchanger 3 partially flows out of the drain outlet through the second cold water pipe section 12, and partially flows out of the drain outlet through the first hot water pipe section 21, thereby realizing the drainage and antifreeze effect of the gas water heater.

[0038] That is, the gas water heater provided in this embodiment can realize automatic switching between the normal working mode and the drainage mode by providing the three-way reversing valve 4, the switch valve 7, the drainage pipe 5 and the bypass pipe 6, so that when the gas water heater needs to be protected from freezing, the gas water heater is automatically switched to the drainage mode to reduce the water in the heat exchanger 3 and its associated pipelines, thereby reducing the probability of the heat exchanger 3 being cracked due to freezing; because the third valve port 4C, the intersection port E and the drainage port are arranged in sequence from top to bottom, when the gas water heater is in the drainage mode, water from the third valve port 4C and the intersection port E and the drainage port are automatically switched to the drainage mode. The water flow from the three-valve port 4C downward to the intersection E collides with the water flow from the bypass pipe 6 to the intersection E, thereby destroying the tension of the water at the intersection E, so that the two water flows can smoothly flow through the intersection E to the drain outlet below. At the same time, the external air can also flow upward to the cold water inlet pipe 1 after passing through the drain outlet, intersection E and the third valve port 4C in sequence under the action of the negative pressure formed by the water flow, thereby balancing the pressure in the pipeline, better facilitating the drainage of the remaining water, improving the drainage effect, and thus improving the antifreeze effect of the gas water heater.

[0039] In one embodiment, the gas water heater further includes an antifreeze temperature sensor 10, which is disposed at the heat exchanger 3 and is used to detect the temperature at the heat exchanger 3. The antifreeze temperature sensor 10 is communicatively connected to the controller 8, so that the controller 8 determines whether the gas water heater needs to be switched to the drainage mode according to the temperature value detected by the antifreeze temperature sensor 10.

[0040] That is, when the temperature value detected by the antifreeze temperature detection device is lower than the preset temperature value, the controller 8 controls the three-way reversing valve 4 and the switch valve 7 to operate synchronously, so that the three-way reversing valve 4 is switched to a state where the second valve port 4B and the third valve port 4C are connected, and the switch valve 7 is switched to an open circuit state, thereby switching the gas water heater to the drainage mode. The preset temperature value is greater than and less than or equal to 5°C, preferably less than or equal to 3°C.

[0041] In one embodiment, the antifreeze temperature sensor 10 detects the temperature inside the heat exchanger 3 to improve detection reliability. In other embodiments, the antifreeze temperature sensor 10 can also detect the temperature of the outer surface of the heat exchanger 3.

[0042] In one embodiment, the switch valve 7 is arranged on the bypass pipe 6 to reduce the amount of hot water entering the bypass pipe 6 when the gas water heater is heating, thereby reducing the amount of water stored in the pipeline after the gas water heater stops heating.

[0043] In one embodiment, the three-way reversing valve 4 and the switch valve 7 are both solenoid valves, so as to improve the control convenience and control reliability of the three-way reversing valve 4 and the switch valve 7 by the controller 8.

[0044] In order to further improve the performance of the gas water heater, in one embodiment, the gas water heater further includes a one-way fluid switch 20, which is arranged at the second hot water pipe section 22 and is used to detect whether water is used at the water-using end. The one-way fluid switch 20 is communicatively connected with the controller 8. When the gas water heater is in the drainage mode, and the one-way fluid switch 20 detects that water is used at the water-using end, the controller 8 controls the three-way reversing valve 4 and the switch valve 7 to switch the state, so as to switch the gas water heater to the normal working mode, meet the user's hot water demand, improve the automaticity and convenience of switching between the drainage mode and the normal working mode of the gas water heater, and improve the performance of the gas water heater.

[0045] In one embodiment, a water flow sensor 30 is further provided on the cold water inlet pipe 1, and the water flow sensor 30 is used to measure the flow of cold water entering the cold water inlet pipe 1. The water flow sensor 30 is communicatively connected with the controller 8, so that the controller 8 can control the combustion power of the combustion assembly according to the flow detected by the water flow sensor 30.

[0046] The water flow sensor 30 is preferably arranged on the cold water inlet pipe section 1, thereby avoiding misjudgment of the controller 8 caused by water flowing through the water flow sensor 30 in the drainage mode of the gas water heater, thereby improving the reliability of the use of the gas water heater.

[0047] Furthermore, a cold water thermometer is provided on the cold water inlet pipe 1, and the cold water thermometer is used to detect the temperature of the cold water entering the cold water inlet pipe 1. The cold water thermometer is connected to the controller 8 for communication, and the controller 8 can adjust the power of the combustion component according to the temperature value detected by the cold water thermometer. The cold water thermometer is preferably provided in the first cold water pipe section 11.

[0048] In one embodiment, the three-way reversing valve 4, the switch valve 7 and the bypass pipe 6 are installed inside the casing 40 of the gas water heater to improve the overall aesthetics of the gas water heater. The drain outlet of the drain pipe 5 extends outside the casing 40 to discharge water to the outside of the gas water heater.

[0049] The controller 8 is connected to the mains via the power connector 50, so that when the mains operates normally, the controller 8 is powered. To further improve the safety of the gas water heater, in one embodiment, the gas water heater further includes a battery 9, which is electrically connected to the controller 8 and is used to supply power to the controller 8 when the mains is off.

[0050] That is, when the 220V mains is normally powered, the controller 8 is powered by the mains; when the mains is cut off, the battery 9 supplies power to the controller 8, so that the controller 8 can immediately control the switching of the three-way reversing valve 4 and the switch valve 7 after the power is cut off, so as to switch the gas water heater to the drainage mode. This setting can enable the controller 8 to switch the gas water heater to the drainage mode in time after the power is cut off due to the user being away for a long time or moving out, thereby avoiding the problem that the gas water heater cannot be switched to the drainage mode due to the power outage in winter when the temperature is low, and better ensure that the gas water heater is always in the drainage mode during a long-term power outage, avoiding the problem that the residual water cannot be discharged due to the power outage, improving the safety of the gas water heater, and improving the user experience of the gas water heater.

[0051] In one embodiment, the battery 9 is a capacitor battery, which is small in size and can automatically charge the controller 8 in a short time after the mains power is cut off, thereby reducing the cost of the battery 9; at the same time, it can also be automatically charged when the controller 8 is connected to the mains power, thereby realizing automatic charging and discharging of the battery 9, reducing the replacement frequency of the battery 9, improving the reliability of the battery 9, and improving the reliability of the gas water heater.

[0052] Embodiment 2

[0053] like Figure 2 As shown, this embodiment provides a gas water heater, and the gas water heater provided in this embodiment has a structure basically the same as that in Embodiment 1, with only some differences in settings. This embodiment will no longer repeat the same contents as Embodiment 1.

[0054] In this embodiment, the drain pipe 5, the three-way reversing valve 4, the switch valve 7 and the bypass pipe 6 are all located outside the casing 40 of the gas water heater, thereby making it convenient for users to disassemble and repair the switch valve 7 and the three-way reversing valve 4.

[0055] Furthermore, the one-way fluid switch 20 is disposed outside the housing 40 .

[0056] Embodiment 3

[0057] like Figure 3 As shown, this embodiment provides a gas water heater, and the gas water heater provided in this embodiment has a structure basically the same as that in Embodiment 1, with only some differences in settings. This embodiment will no longer repeat the same contents as Embodiment 1.

[0058] In this embodiment, the gas water heater includes a wireless communication module 60, which is connected to the controller 8 for communication. The wireless communication module 60 is used to receive instructions sent by the user through wireless transmission and transmit the instructions to the controller 8. By providing the wireless communication module 60, it is convenient for the user to control the operation of the gas water heater through wireless control, thereby improving the flexibility of use of the gas water heater.

[0059] Furthermore, the controller 8 includes a remote control module, and the user can send instructions to the wireless communication module 60 through a remote controller or a mobile phone to achieve remote control of the gas water heater.

[0060] For example, the user can send a command to switch the gas water heater to the normal working mode or the drainage mode through remote control; or when the user sends a water use instruction to the controller 8 through remote control, and the current gas water heater is in the drainage mode, the controller 8 controls the switch valve 7 and the three-way reversing valve 4 to automatically switch to switch the gas water heater to the daily working mode.

[0061] It is understandable that the principle and specific implementation method of controlling the operation of the gas water heater by remote control or PP and other remote control methods are prior art, and this embodiment does not limit this.

[0062] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A gas water heater, comprising a heat exchanger (3), a cold water inlet pipe (1) connected to the water inlet end of the heat exchanger (3), and a hot water outlet pipe (2) connected to the water outlet end of the heat exchanger (3), characterized in that: The gas water heater also includes: A three-way reversing valve (4) having a first valve port (4A), a second valve port (4B) and a third valve port (4C), wherein the first valve port (4A) and the second valve port (4B) are connected in series to the cold water inlet pipe (1), and the first valve port (4A) is located upstream of the second valve port (4B), and the three-way reversing valve (4) controls the second valve port (4B) to be connected to the first valve port (4A) or the third valve port (4C); A drainage pipe (5), the upper end of which is connected to the third valve port (4C) and the lower end of which forms a drainage port; a bypass pipe (6) connected between the drain pipe (5) and the hot water outlet pipe (2); a junction (E) is formed at the connection between the bypass pipe (6) and the drain pipe (5); the third valve port (4C), the junction (E) and the drain port are arranged in sequence from top to bottom; an on-off valve (7), which is arranged in the bypass pipe (6) and is used to control the on-off of the bypass pipe (6), or is arranged between the drain port and the junction (E) and is used to control the on-off of the drain pipe (5); The controller (8) is communicatively connected to the three-way reversing valve (4) and the switch valve (7).

2. The gas water heater according to claim 1, characterized in that: The connection position between the bypass pipe (6) and the hot water outlet pipe (2) forms a bypass connection position (F); the hot water outlet pipe (2) is provided with a one-way fluid switch (20); the one-way fluid switch (20) is located downstream of the bypass connection position (F) and is used to detect whether water flows at the outlet end of the hot water outlet pipe (2); the one-way fluid switch (20) is communicatively connected with the controller (8).

3. The gas water heater according to claim 1, characterized in that: The gas water heater further comprises an antifreeze temperature sensor (10), wherein the antifreeze temperature sensor (10) is arranged on the heat exchanger (3) and is used to detect the temperature at the heat exchanger (3), and the antifreeze temperature sensor (10) is communicatively connected with the controller (8).

4. The gas water heater according to claim 1, characterized in that: The controller (8) is connected to the mains electricity via a power supply connector (50); the gas water heater further comprises a battery (9); the battery (9) is electrically connected to the controller (8); and the battery (9) is used to supply power to the controller (8).

5. The gas water heater according to claim 4, characterized in that: The storage battery (9) is a capacitor battery.

6. The gas water heater according to claim 1, characterized in that: The switch valve (7) and the three-way reversing valve (4) are both solenoid valves.

7. The gas water heater according to any one of claims 1 to 6, characterized in that: The drainage pipe (5), the three-way reversing valve (4), the switch valve (7) and the bypass pipe (6) are all located outside the casing (40) of the gas water heater.

8. The gas water heater according to any one of claims 1 to 6, characterized in that: The three-way reversing valve (4), the switch valve (7) and the bypass pipe (6) are located inside the casing (40) of the gas water heater, and the drainage outlet of the drainage pipe (5) extends downwardly outside the casing (40).

9. The gas water heater according to any one of claims 1 to 6, characterized in that: The gas water heater comprises a wireless communication module (60), and the wireless communication module (60) is communicatively connected with the controller (8).

10. The gas water heater according to any one of claims 1 to 6, characterized in that: The cold water inlet pipe (1) is provided with a water flow sensor (30), and the water flow sensor (30) is communicatively connected with the controller (8).

Images