Control method of gas water heater system and gas water heater system

Abstract

The invention relates to the technical field of control of gas water heater systems, and discloses a control method of a gas water heater system and the gas water heater system.The gas water heater system comprises a gas water heater and a bath controller, the gas water heater is in communication connection with the bath controller, and the bath controller is located near a water using point; a water electromagnetic valve is arranged on a water outlet pipeline of the water using point, and the bath controller is in communication connection with the water electromagnetic valve; the method comprises the steps that the gas water heater responds to a water turning-off request of water using equipment of the gas water heater system, and a combustor of the gas water heater is controlled to be turned off; and after the burner of the gas water heater flames out, the bath controller delays the preset time to close the water electromagnetic valve. After the burner flames out, the waste heat of the gas water heater heats the cold water entering the heat exchanger within the preset time, and the situation that due to the fact that the waste heat of the gas water heater continues to heat the hot water in the heat exchanger pipe, the water supply is cut off, and the temperature rises when the gas water heater boils water again is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of gas water heater technology, specifically to a control method for a gas water heater system and a gas water heater system. Background Technology

[0002] When a gas water heater is turned off midway through use, the residual heat continues to heat the water in the heat exchanger tubes. This can cause a temperature rise issue when the water is turned back on shortly after the water is turned off, which can easily scald users and affect the user experience. Summary of the Invention

[0003] In view of this, the present invention provides a control method for a gas water heater system and a gas water heater system, which can improve the problem of users being easily scalded due to excessively high temperature caused by water outage.

[0004] In a first aspect, the present invention provides a control method for a gas water heater system, the gas water heater system including a gas water heater and a bathroom controller, the gas water heater being communicatively connected to the bathroom controller, the bathroom controller being located near the point of use, the water outlet pipe of the point of use being equipped with a water solenoid valve, and the bathroom controller being communicatively connected to the water solenoid valve; the method includes:

[0005] The gas water heater responds to the water shut-off request from the water-using equipment in the gas water heater system by controlling the burner of the gas water heater to shut off.

[0006] After the burner of the gas water heater is turned off, the water controller closes the water solenoid valve after a preset delay.

[0007] The control method of the gas water heater system in this embodiment of the invention, after controlling the burner of the gas water heater to shut off in response to the water shut-off request of the water-using equipment, delays for a preset time before closing the water solenoid valve of the gas water heater. That is, after the gas water heater is turned off, the water solenoid valve remains open for a corresponding time, allowing cold water to enter the heat exchange tubes of the heat exchanger for heat exchange. This portion of cold water can absorb more heat from the heat exchanger, thereby reducing the overall temperature rise. Even if the water is turned on again in a short time, it is less likely to cause scalding. This improves the problem of users being easily scalded due to excessively high temperature rise caused by water shut-off.

[0008] In some alternative implementations, the method further includes: before closing the water solenoid valve after a preset delay time.

[0009] Obtain the water quality inside the heat exchanger of the gas water heater and the current water flow rate in the water circuit;

[0010] Calculate the preset time based on the water quality and current water flow.

[0011] In some alternative implementations, the method further includes: before closing the water solenoid valve after a preset delay time.

[0012] Obtain the water quality, preset temperature rise, inlet and outlet water temperature difference, and current water flow rate inside the heat exchanger of the gas water heater;

[0013] The preset time is calculated based on the water quality inside the heat exchanger, the preset temperature rise, the temperature difference between the inlet and outlet water, and the current water flow rate.

[0014] In some optional implementations, a preset time is calculated based on the mass of the water in the heat exchanger, the preset temperature rise, the inlet and outlet water temperature difference, and the current water flow rate, including:

[0015] The preset time is calculated using the following formula:

[0016]

[0017] Where α represents a thermal efficiency coefficient;

[0018] L represents the length of the water pipe in the heat exchanger of the gas water heater;

[0019] d represents the inner diameter of the water pipe in the heat exchanger of the gas water heater;

[0020] ρ represents the density of water;

[0021] Indicates the mass of water;

[0022] Q represents the current water flow rate;

[0023] ΔT t Indicates the preset temperature rise;

[0024] t2 represents the current outlet water temperature;

[0025] t1 represents the current inlet water temperature;

[0026] t1-t2 represents the temperature difference between the inlet and outlet water.

[0027] In some alternative implementations, the method further includes: before the water solenoid valve is closed by the bathroom controller after a preset delay time.

[0028] To obtain the quality of the water inside the heat exchanger of a gas water heater;

[0029] Within a preset time after receiving a water shut-off request, the water flow rate of the gas water heater is adjusted based on the quality of the water in the heat exchanger.

[0030] In some alternative implementations, the water flow rate of the gas water heater is adjusted based on the quality of the water within the heat exchanger, including:

[0031] Obtain the preset temperature rise of the heat exchanger and the temperature difference between the inlet and outlet water;

[0032] The delayed water flow rate of the gas water heater is determined based on the water quality in the heat exchanger, the preset temperature rise, the temperature difference between the inlet and outlet water, and the preset time.

[0033] Upon receiving a request to turn off the water, adjust the water flow of the gas water heater to a delayed flow rate;

[0034] Within a preset time period, the gas water heater is controlled to operate with a delayed water flow.

[0035] In some optional implementations, the delayed water flow rate of the gas water heater is determined based on the mass of the water in the heat exchanger, the preset temperature rise, the inlet and outlet water temperature difference, and the preset time, including:

[0036] The delayed water flow rate is determined using the following formula:

[0037]

[0038] Q1 represents the delayed water flow rate;

[0039] α represents a thermal efficiency coefficient;

[0040] L represents the length of the water pipe in the heat exchanger of the gas water heater;

[0041] d represents the inner diameter of the water pipe in the heat exchanger of the gas water heater;

[0042] ρ represents the density of water;

[0043] Indicates the mass of water;

[0044] ΔT1 represents the preset time;

[0045] ΔT t Indicates the preset temperature rise;

[0046] t2 represents the current outlet water temperature;

[0047] t1 represents the current inlet water temperature;

[0048] t1-t2 represents the temperature difference between the inlet and outlet water.

[0049] In a second aspect, the present invention provides a gas water heater system, comprising: a gas water heater and a bathroom controller, wherein the gas water heater and the bathroom controller are communicatively connected, the bathroom controller is located near a water point, a water outlet pipe at the water point is provided with a water solenoid valve, and the bathroom controller is communicatively connected to the water solenoid valve; the gas water heater system executes the control method of the gas water heater system of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0050] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 A schematic diagram of the bathroom controller for a gas water heater system is shown.

[0052] Figure 2 A schematic diagram of the display information of the bathroom controller in some optional embodiments is shown;

[0053] Figure 3 This is a flowchart illustrating the control method of a gas water heater system according to an embodiment of the present invention;

[0054] Figure 4 This is a flowchart illustrating a control method for another gas water heater system according to an embodiment of the present invention;

[0055] Figure 5 This is a flowchart illustrating a control method for a gas water heater system according to an embodiment of the present invention.

[0056] Figure 6 This is a schematic diagram of the hardware structure of a controller according to an embodiment of the present invention. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] This invention provides a control method and system for a gas water heater to solve the problem of temperature rise during water outages in gas water heaters. Specifically, when the water is turned off midway through use, residual heat continues to heat the water in the heat exchanger tubes, causing a temperature rise when the water is turned back on. This can easily scald users and negatively impact the user experience; this is commonly referred to as water outage temperature rise. This invention provides a control method for a gas water heater system primarily to address this problem.

[0059] To better describe the control method of the gas water heater according to the embodiments of the present invention, the application scenario of the present invention will be briefly described first. The embodiments of the present invention can be applied to a gas water heater system, which may include a gas water heater and a bathroom controller. The gas water heater and the bathroom controller are communicatively connected. The bathroom controller is located near the point of use, and the water outlet pipe of the point of use is equipped with a water solenoid valve. The bathroom controller and the water solenoid valve are communicatively connected.

[0060] Figure 1 A schematic diagram of the bathroom controller for a gas water heater system is shown, such as... Figure 1 As shown, the bathroom controller is equipped with a temperature sensor (not shown) and a communication module (not shown). The bathroom controller is installed in the water circuit of the gas water heater and before the water outlet device. Based on the temperature collected by the temperature sensor in the bathroom controller, the first display area 106 of the bathroom controller can display the water temperature flowing through the bathroom controller in real time, and the second display area 105 can display the preset water outlet temperature in real time. The preset water outlet temperature is the preset water outlet temperature set by the user through the temperature decrease button 103 and the temperature increase button 104 of the bathroom controller. The communication module is used to establish communication with the gas water heater. Optionally, the user can send a water use request or a water shut-off request to the gas water heater by pressing the power button 102; the bathroom controller controls the water solenoid valve to open or close, so as to realize the water supply of the water-using device 101.

[0061] In some alternative implementations, the gas water heater system's shower controller may display only the preset outlet water temperature, without displaying the water temperature flowing through the shower controller. Figure 2 The diagram illustrates the display information of the bathroom controller in some optional implementations, such as... Figure 2 As shown, the display area of ​​the bathroom controller only shows the preset water temperature.

[0062] According to an embodiment of the present invention, a control method for a gas water heater system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0063] This embodiment provides a control method for a gas water heater system, which can be used in the aforementioned gas water heater system. The gas water heater system includes a gas water heater and a bathroom controller. The gas water heater and the bathroom controller are communicatively connected. The bathroom controller is located near the water point. The water outlet pipe of the water point is equipped with a water solenoid valve. The bathroom controller and the water solenoid valve are communicatively connected. Figure 3 This is a flowchart of a control method for a gas water heater system according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps:

[0064] In step S301, the gas water heater responds to the water shut-off request from the water-using equipment in the gas water heater system by controlling the burner of the gas water heater to shut off.

[0065] Specifically, when a user needs to use water or turn off the water, they can press the corresponding button on the gas water heater's panel or the bathroom controller. The controller then receives this button press information and receives the water usage request or water shut-off request. In practical applications, other methods, such as voice control, can also be used.

[0066] When a gas water heater system receives a water shut-off request, the heater control unit or controller can respond to the water shut-off request from the water-using equipment of the gas water heater and promptly control the burner of the gas water heater to shut off, thereby reducing energy consumption.

[0067] Step S302: The water controller closes the water solenoid valve after a preset delay time.

[0068] Specifically, after the burner of a gas water heater is turned off, the heat exchanger stores some residual heat. If the water solenoid valve is closed directly at this time, the residual heat in the heat exchanger will reheat the water in the heat exchange tubes, continuously heating the water to a temperature exceeding the preset outlet water temperature. Therefore, the preset delay time can be a fixed time set in advance, or it can be determined in real time based on parameters such as the water quality in the gas water heater's heat exchanger and the temperature difference between the inlet and outlet water.

[0069] The control method for a gas water heater system in this embodiment of the invention, after controlling the burner of the gas water heater to shut off in response to a water shut-off request from the water-using device, delays for a preset time before closing the water solenoid valve. That is, even after the gas water heater is turned off, cold water continues to enter the heat exchanger tubes. This cold water entering the heat exchanger absorbs more heat from the heat exchanger, thus mitigating the problem of excessively high temperatures due to water outages, which could easily scald users.

[0070] This embodiment provides a control method for a gas water heater system, which can be used in the aforementioned gas water heater system. The gas water heater system includes a gas water heater and a bathroom controller. The gas water heater and the bathroom controller are communicatively connected. The bathroom controller is located near the water point. The water outlet pipe of the water point is equipped with a water solenoid valve. The bathroom controller and the water solenoid valve are communicatively connected. Figure 4 This is a flowchart of a control method for a gas water heater system according to an embodiment of the present invention, such as... Figure 4 As shown, the process includes the following steps:

[0071] In step S401, the gas water heater responds to the water shut-off request from the water-using equipment in the gas water heater system by controlling the burner of the gas water heater to shut off.

[0072] Please see the above for details. Figure 3 Step S301 of the illustrated embodiment will not be described again here.

[0073] Step S402: Obtain the water quality, preset temperature rise, inlet and outlet water temperature difference, and current water flow rate in the heat exchanger of the gas water heater.

[0074] Specifically, the mass of water inside the heat exchanger refers to the mass of water that the heat exchange tubes of the heat exchanger can hold, which can be pre-stored in the memory of the gas water heater.

[0075] In other embodiments, the parameters of the heat exchange tube can also be stored in advance. The parameters of the gas water heater's heat exchanger, such as its diameter, are fixed. Based on the parameters of the gas water heater's capacity and the density of the water, the quality of the water in the gas water heater's heat exchanger can be directly determined.

[0076] The preset temperature rise is stored in the gas water heater's memory and can be directly retrieved during calculation. It can be set according to actual conditions. For example, the average temperature rise of the gas water heater under various conditions can be used as the preset temperature rise, or the maximum temperature rise occurring under various conditions can be used as the preset temperature rise; alternatively, the temperature rise parameter required by industry standards can be used as the preset temperature rise. The inlet and outlet water temperature difference can be calculated directly from the temperature obtained by the temperature sensor, and the current water flow rate can be directly obtained by the water flow sensor.

[0077] Step S403: Calculate the preset time based on the water quality, preset temperature rise, inlet and outlet water temperature difference, and current water flow rate.

[0078] In some alternative implementations, a preset time is calculated based on the mass of water in the heat exchanger, the preset temperature rise, the temperature difference between the inlet and outlet water, and the current water flow rate.

[0079] Specifically, the preset time can be calculated using the following formula:

[0080]

[0081] Where α represents a thermal efficiency coefficient; and 0 < α ≤ 1.

[0082] L represents the length of the water pipe in the heat exchanger of the gas water heater, which is a fixed parameter of the heat exchanger.

[0083] d represents the inner diameter of the water pipe in the heat exchanger of the gas water heater, which is a fixed parameter of the heat exchanger;

[0084] ρ represents the density of water, which is a constant;

[0085] Indicates the mass of water;

[0086] Q represents the current water flow rate;

[0087] ΔTt This indicates the preset temperature rise, which is a constant.

[0088] t2 represents the preset water temperature, which is a parameter received from the display of the bath controller or control panel; for example, if the user sets the water temperature to 40°, then t2 is 40°.

[0089] t1 represents the current inlet water temperature, which can be obtained from the temperature sensor at the inlet end;

[0090] t1-t2 represents the temperature difference between the inlet and outlet water.

[0091] Step S404: After the burner of the gas water heater is turned off, the bathroom controller closes the water solenoid valve after a preset delay.

[0092] When a water shut-off request is received, a timer starts. After a preset time is determined and the timer reaches the preset time, the water solenoid valve is shut off.

[0093] This embodiment provides a control method for a gas water heater system, which can be used in the aforementioned gas water heater system. The gas water heater system includes a gas water heater and a bathroom controller. The gas water heater and the bathroom controller are communicatively connected. The bathroom controller is located near the water point. The water outlet pipe of the water point is equipped with a water solenoid valve. The bathroom controller and the water solenoid valve are communicatively connected. Figure 5 This is a flowchart of a control method for a gas water heater system according to an embodiment of the present invention, such as... Figure 5 As shown, the process includes the following steps:

[0094] In step S501, the gas water heater responds to the water shut-off request from the water-using equipment in the gas water heater system by controlling the burner of the gas water heater to shut off.

[0095] Please see the above for details. Figure 3 Step S301 of the illustrated embodiment will not be described again here.

[0096] Step S502: Obtain the mass of the water inside the heat exchanger of the gas water heater.

[0097] Please refer to step S402 for details, which will not be repeated here.

[0098] Step S503: Within a preset time after receiving the water shut-off request, adjust the water flow rate of the gas water heater based on the quality of the water in the heat exchanger.

[0099] In some alternative implementations, step S503 may include:

[0100] Step S5031: Obtain the preset temperature rise of the heat exchanger and the temperature difference between the inlet and outlet water.

[0101] In addition to the water quality, it is also necessary to obtain the preset temperature rise of the heat exchanger and the temperature difference between the inlet and outlet water. Please refer to step S402 for details, which will not be repeated here.

[0102] Step S5032: Determine the delayed water flow rate of the gas water heater based on the water quality in the heat exchanger, the preset temperature rise, the temperature difference between the inlet and outlet water, and the preset time.

[0103] Specifically, the delayed water flow rate can be determined using the following formula in step S5032 above:

[0104]

[0105] Q1 represents the delayed water flow rate;

[0106] α represents a thermal efficiency coefficient;

[0107] L represents the length of the water pipe in the heat exchanger of the gas water heater;

[0108] d represents the inner diameter of the water pipe in the heat exchanger of the gas water heater;

[0109] ρ represents the density of water;

[0110] Indicates the mass of water;

[0111] ΔT1 represents the preset time;

[0112] ΔT t Indicates the preset temperature rise;

[0113] t2 represents the current outlet water temperature;

[0114] t1 represents the current inlet water temperature;

[0115] t1-t2 represents the temperature difference between the inlet and outlet water.

[0116] Step S5033: Upon receiving a water shut-off request, adjust the water flow rate of the gas water heater to a delayed water flow rate, and control the gas water heater to operate at the delayed water flow rate for a preset time.

[0117] Specifically, the preset time is a fixed value. Upon receiving a water shut-off request, the water flow rate of the gas water heater is adjusted to a delayed flow rate. Within the preset time, the gas water heater is controlled to operate at the delayed flow rate. This effectively controls the duration of the preset time and quickly resolves the issue of temperature rise during water outages.

[0118] Step S504: After the burner of the gas water heater is turned off, the bathroom controller closes the water solenoid valve after a preset delay.

[0119] Please see the above for details. Figure 3 Step S302 of the illustrated embodiment will not be described again here.

[0120] The control method for the gas water heater described above can be configured in the gas water heater system in the form of multiple functional modules. The further functional descriptions of each module and unit are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0121] In this embodiment, the various functional modules of the gas water heater system are presented in the form of functional units. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0122] This invention also provides a controller, which can be a controller for the gas water heater in a gas water heater system or a controller for the bathroom heater. The controller for the gas water heater or the controller for the bathroom heater cooperates with each other to execute the control method for the gas water heater provided in the above embodiments.

[0123] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a controller provided in an optional embodiment of the present invention, such as... Figure 6 As shown, the controller includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise as required. The processors can process instructions executed within the controller, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple controllers can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 6 Take a processor 10 as an example.

[0124] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0125] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0126] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the controller. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the controller via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0127] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0128] The controller also includes a communication interface 30 for communicating with other devices or communication networks.

[0129] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0130] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0131] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended technical solutions.

Claims

1. A control method for a gas water heater system, the gas water heater system comprising a gas water heater and a bathroom controller, the gas water heater being communicatively connected to the bathroom controller, the bathroom controller being located near the point of use, characterized in that, The water outlet pipe at the water point is equipped with a water solenoid valve, and the bath controller is communicatively connected to the water solenoid valve; the method includes: The gas water heater responds to a water shut-off request from the water-using equipment in the gas water heater system by controlling the burner of the gas water heater to shut off; After the burner of the gas water heater is turned off, the bath controller closes the water solenoid valve after a preset delay.

2. The method according to claim 1, characterized in that, Before the water solenoid valve is closed by the water controller after a preset delay time, the method further includes: The mass of water in the heat exchanger of the gas water heater, the preset temperature rise, the inlet and outlet water temperature difference, and the current water flow rate are obtained. The preset time is calculated based on the mass of water in the heat exchanger, the preset temperature rise, the temperature difference between the inlet and outlet water, and the current water flow rate.

3. The method according to claim 2, characterized in that, The calculation of the preset time based on the mass of water in the heat exchanger, preset temperature rise, inlet and outlet water temperature difference, and current water flow rate includes: The preset time is calculated using the following formula: Where α represents a thermal efficiency coefficient; L represents the length of the heat exchange tube in the heat exchanger of the gas water heater; d represents the inner diameter of the heat exchange tube in the heat exchanger of the gas water heater; ρ represents the density of water; This indicates the mass of the water; Q represents the current water flow rate; ΔT t This indicates the preset temperature rise; t2 represents the current outlet water temperature; t1 represents the current inlet water temperature; t1-t2 represents the temperature difference between the inlet and outlet water.

4. The method according to claim 1, characterized in that, Before the water solenoid valve is closed by the water controller after a preset delay time, the method further includes: Obtain the mass of the water inside the heat exchanger of the gas water heater; Within the preset time period after receiving the water shut-off request, the water flow rate of the gas water heater is adjusted based on the quality of the water in the heat exchanger.

5. The method according to claim 4, characterized in that, The adjustment of the water flow rate of the gas water heater based on the mass of the water in the heat exchanger includes: The preset temperature rise and inlet / outlet water temperature difference of the heat exchanger are obtained; The delayed water flow rate of the gas water heater is determined based on the mass of the water in the heat exchanger, the preset temperature rise, the temperature difference between the inlet and outlet water, and the preset time. Upon receiving the water shut-off request, the water flow rate of the gas water heater is adjusted to the delayed water flow rate, and the gas water heater is controlled to operate at the delayed water flow rate within the preset time.

6. The method according to claim 5, characterized in that, The determination of the delayed water flow rate of the gas water heater based on the mass of the water in the heat exchanger, the preset temperature rise, the inlet and outlet water temperature difference, and the preset time includes: The delayed water flow rate is determined using the following formula: Wherein, Q1 represents the delayed water flow rate; α represents a thermal efficiency coefficient; L represents the length of the heat exchange tube in the heat exchanger of the gas water heater; d represents the inner diameter of the heat exchange tube in the heat exchanger of the gas water heater; ρ represents the density of water; This indicates the mass of the water; ΔT1 represents the preset time; ΔT t This indicates the preset temperature rise; t2 represents the current outlet water temperature; t1 represents the current inlet water temperature; t1-t2 represents the temperature difference between the inlet and outlet water.

7. A gas-fired water heater system, comprising: A gas water heater and a bathroom controller, wherein the gas water heater and the bathroom controller are communicatively connected, and the bathroom controller is located near the point of use, characterized in that the water outlet pipe of the point of use is equipped with a water solenoid valve, and the bathroom controller is communicatively connected to the water solenoid valve; the gas water heater system executes the control method of the gas water heater system according to any one of claims 1 to 6.

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