A water heater

By designing a water collection box and a water pump in the water heater, the problem of the safety valve draining water onto the wet ground is solved, resulting in a better user experience and safety, and simplifying the cleaning process.

CN224470458UActive Publication Date: 2026-07-07QINGDAO ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE HAIER WATER HEATER CO LTD +1

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
QINGDAO ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE HAIER WATER HEATER CO LTD
Filing Date
2025-06-30
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The safety valve drain outlet of existing water heaters drains water into the ground, causing the ground to become damp, affecting the user experience and reducing safety.

Method used

The design includes a water collection box to collect water discharged from the safety valve, and a pumping unit to guide the water into the outlet pipe. Combined with a water level detection device and a controller, the pumping unit is opened and closed to prevent water overflow.

Benefits of technology

It improves user experience and safety, avoids damp floors and water spills, and simplifies manual cleaning procedures.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a water heater, water inlet pipe and water outlet pipe are provided on water heater body, safety valve is provided on water inlet pipe, and the water outlet is provided on safety valve, the water heater still includes the water receiving box, and the water receiving box is configured to receive the water flowing out from the water outlet, avoids the problem that the ground is damp and the user is easy to fall down caused by the direct drainage to the ground, improves user experience and use safety, and the water in the water receiving box is pumped to the water outlet pipe, avoids the water in the water receiving box from overflowing after being full, and manual water pouring is not needed, and user experience is further improved.
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Description

Technical Field

[0001] This utility model belongs to the field of household appliance technology, and in particular relates to a water heater. Background Technology

[0002] The water heater's inlet pipe is equipped with a safety valve. During the heating process, if the internal water pressure becomes too high, the safety valve opens to release pressure and drain the water. A drain outlet is connected to the safety valve, and the water flowing out of the safety valve is discharged through this outlet.

[0003] In related technologies, the drain outlet is connected to a guide pipe, which directs the water flowing out of the safety valve to the ground, making the ground wet. This not only affects the user experience but also makes users more prone to slipping, thus reducing safety. Utility Model Content

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides a water heater.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] In some embodiments of this application, a water heater is provided, comprising:

[0007] The water heater body is provided with an inlet pipe and an outlet pipe, the inlet pipe is provided with a safety valve, and the safety valve is provided with a drain outlet.

[0008] A water collection box, configured to collect water flowing out of the drain outlet;

[0009] The pumping unit is configured to pump water from the water receiving box to the water outlet pipe.

[0010] Compared with existing technologies, the above technical solution has the following advantages or beneficial effects:

[0011] The water heater in this application uses a water collection box to hold the water flowing out of the safety valve, avoiding the problem of the ground becoming wet and users easily slipping and falling due to the direct flow of drainage onto the ground, thus improving the user experience and safety.

[0012] The water in the water collection box is pumped to the water outlet pipe by the pumping unit. The water in the water collection box flows out with the water outlet pipe, which prevents the water in the water collection box from overflowing when it is full. This eliminates the need for manual emptying of water and further improves the user experience.

[0013] In some embodiments of this application, the water heater further includes:

[0014] A water level detection device, configured to detect the water level in the water receiving box;

[0015] A controller configured to control the opening and closing of the pumping unit based on feedback data from the water level detection device.

[0016] In some embodiments of this application, the pumping unit includes a pump; the inlet of the pump is connected to an inlet branch pipe, the inlet of the inlet branch pipe being close to the bottom of the water receiving box; the outlet of the pump is connected to an outlet branch pipe, the outlet branch pipe being connected to the outlet pipe.

[0017] In some embodiments of this application, the water heater further includes a fixing base, which is disposed at the bottom of the water heater body. The inlet pipe and the outlet pipe pass through the fixing base, and the water receiving box is connected to the fixing base.

[0018] In some embodiments of this application, the water pump is mounted on the fixed base.

[0019] In some embodiments of this application, the water receiving box is detachably connected to the fixing base.

[0020] In some embodiments of this application, the water receiving box is configured to move along a first horizontal direction to be installed on the fixed base, and the water receiving box is also configured to move along a second horizontal direction to separate from the fixed base; the first horizontal direction and the second horizontal direction are opposite in direction.

[0021] In some embodiments of this application, slots are provided on the two opposite outer sidewalls of the fixing base, and the slots extend along the width direction of the fixing base; insertion portions are provided on the two opposite inner sidewalls of the water receiving box, and the insertion portions extend along the width direction of the water receiving box; the insertion portions are disposed in the slots.

[0022] In some embodiments of this application, the slot is provided with a connecting rib, and the connecting rib and the bottom of the slot form an insertion opening; the insertion part includes a first insertion part, which is inserted into the insertion opening.

[0023] In some embodiments of this application, a first limiting portion is provided on the bottom of the slot; the insertion portion includes a second insertion portion, and a second limiting portion is provided on the second insertion portion; the first limiting portion cooperates with the second limiting portion.

[0024] In some embodiments of this application, a notch is provided on the circumferential wall of the water receiving box, and the water inlet pipe and the water outlet pipe are directly opposite the notch. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of a water heater according to some embodiments;

[0027] Figure 2 This is another structural diagram of a water heater according to some embodiments;

[0028] Figure 3 for Figure 2 A structural diagram omitting the water receiving box;

[0029] Figure 4 This is a structural diagram of a water receiving box according to some embodiments;

[0030] Figure 5 for Figure 4 Enlarged view of section A in the middle;

[0031] Figure 6 This is a structural diagram of a mounting bracket according to some embodiments.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Water heater body; 110. Mounting bracket; 120. Inlet pipe; 130. Outlet pipe; 140. Safety valve; 150. Drain outlet;

[0034] 200, Fixing base; 210, Slot; 211, Insert; 212, First limiting part; 213, Connecting rib; 220, Bottom wall; 230, Circumferential wall; 240, Screw post; 250, First opening; 260, Second opening;

[0035] 300. Water receiving box; 310. Insertion part; 311. First insertion part; 312. Second insertion part; 313. Insertion tongue; 314. Second limiting part; 320. Base plate; 330. Circumferential side plate; 340. Notch; 350. Indicator part;

[0036] 400. Pumping unit; 410. Water pump; 420. Inlet branch pipe; 430. Outlet branch pipe;

[0037] 500. Water level detection device. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0043] An electric water heater is a type of water heater that uses electricity as its primary energy source. The high-temperature heat generated after the power is turned on directly heats the water stored in the water heater to produce hot water.

[0044] Electric water heaters typically consist of a water tank, an electric heating element, and an electronic control board. The water tank has a storage cavity to store water to be heated. The electric heating element is inserted into the storage cavity of the water tank. The electronic control board is used to control the electric heating element to operate by turning the power on and off, so that the water in the tank is heated to the set temperature.

[0045] For the water tank of an electric water heater, the tank generally consists of an outer shell and an inner tank, with an insulation layer between them. The outer shell is usually made of plastic to meet the requirements of aesthetic and diverse designs; the inner tank can be made of metal or plastic, depending on the needs.

[0046] In addition, the insulation layer formed between the outer shell and the inner liner is commonly made of materials such as asbestos, sponge, foam plastic, and polyurethane foam. In conventional technology, foaming is usually used to form the insulation layer in order to achieve good insulation effect.

[0047] For water tanks with metal inner liner, corrosion can easily occur inside due to water quality. Therefore, magnesium rods are installed on the water tank and inserted into the water storage cavity inside the tank.

[0048] The water tank is also equipped with an inlet pipe and an outlet pipe. The inlet pipe is used to deliver cold water into the water storage cavity formed inside the water tank, while the hot water in the water storage cavity is output from the outlet pipe.

[0049] For electric heating components, electric heating methods such as electric heating wires, magnetic energy, or silicon tube heating can be used to heat the water stored in the water storage chamber.

[0050] The control board is used to receive detection signals from relevant sensors (such as water temperature sensors and flow sensors) and control the power supply to and from the electric heating components.

[0051] When the electric water heater is working, the electric control board controls the electric heating element to be powered on and heated. When the water temperature in the tank reaches the set value, the electric control board controls the electric heating element to be powered off.

[0052] In some embodiments of this application, a water heater is provided. Figure 1 This is a structural diagram of a water heater viewed from the front. Figure 2 This is a structural diagram of a water heater viewed from the rear. The water heater includes a water heater body 100, on which an inlet pipe 120 and an outlet pipe 130 are provided. A water storage chamber is formed inside the water heater body 100, the inlet pipe 120 supplies water to the water storage chamber, and the water in the water storage chamber flows out through the outlet pipe 130.

[0053] A mounting bracket 110 is provided on the back side of the water heater body 100. The mounting bracket 110 is fixed to the wall with screws to achieve fixed installation of the water heater.

[0054] A safety valve 140 is installed on the water inlet pipe 120, and a drain outlet 150 is installed on the safety valve 140. During the heating process of the water heater, when the internal pressure of the water circuit is too high, the safety valve 140 opens to release pressure and drain water. The drain outlet 150 is connected to the safety valve 140, and the water flowing out of the safety valve 140 is discharged through the drain outlet 150.

[0055] In related technologies, the drain outlet 150 is connected to a guide pipe, which guides the water flowing out of the safety valve 140 to the ground, making the ground wet. This not only affects the user experience, but also makes it easy for users to slip and fall, thus reducing the safety of use.

[0056] To solve this technical problem, the water heater of this application also includes a water receiving box 300, which is configured to collect water flowing out from the drain outlet 150. Figure 4 This is a structural diagram of a water receiving box 300. Figure 5 for Figure 4 Enlarged view of section A.

[0057] The water heater also includes a water pumping section 400, which is configured to pump water from the water receiving box 300 to the water outlet pipe 130.

[0058] The water heater in this application uses a water collection box 300 to collect the water flowing out of the safety valve 140, avoiding the problem of the ground becoming wet and users easily slipping and falling due to the direct flow of drainage onto the ground, thus improving the user experience and safety.

[0059] The water in the water collection box 300 is pumped through the pumping unit 400 to the water outlet pipe 130. The water in the water collection box 300 flows out with the water outlet pipe 130, which prevents the water in the water collection box 300 from overflowing when it is full. This eliminates the need for manual emptying of water and further improves the user experience.

[0060] In some embodiments of this application, reference is made to Figure 2 The water heater also includes a water level detection device 500, which is configured to detect the water level in the water receiving box 300. For example, the water level detection device 500 is a water level sensor probe.

[0061] The water heater also includes a controller configured to control the opening and closing of the pumping unit 400 based on feedback data from the water level detection device 500.

[0062] When the water level detection device 500 detects that the water level in the water receiving box 300 has risen to the first water level threshold set by the system, the controller controls the pumping unit 400 to start. The pumping unit 400 pumps the water in the water receiving box 300 into the water outlet pipe 130 to discharge the water in the water receiving box 300 in a timely manner and prevent the water in the water receiving box 300 from overflowing.

[0063] When the water level detection device 500 detects that the water level in the water receiving box 300 has dropped to the second water level threshold set by the system, the controller controls the pumping unit 400 to shut down. The first water level threshold is greater than the second water level threshold. This avoids frequent starting of the pumping unit 400.

[0064] In some embodiments of this application, reference is made to Figure 3 , Figure 3 for Figure 2 A structural diagram omitting the water receiving box 300 shows a pumping unit 400 including a pump 410. The inlet of the pump 410 is connected to an inlet branch pipe 420, the inlet of which is located near the bottom of the water receiving box 300. The outlet of the pump 410 is connected to an outlet branch pipe 430, which is connected to an outlet pipe 130. The controller is configured to control the start and stop of the pump 410 based on feedback data from the water level detection device 500.

[0065] The inlet of the water inlet branch pipe 420 of the water pump 410 is set close to the bottom of the water receiving box 300, so that the water pump 410 can reliably draw water from the water receiving box 300 and improve drainage reliability.

[0066] In some embodiments of this application, the water heater also includes a fixing base 200, which is disposed at the bottom of the water heater body 100, and the inlet pipe 120 and the outlet pipe 130 pass through the fixing base 200. Figure 6 This is a structural diagram of the fixing base 200. The water receiving box 300 is connected to the fixing base 200.

[0067] The water receiving box 300 is set on the fixing base 200, which facilitates the installation of the water receiving box 300. Only structural modifications to the existing fixing base 200 are needed to meet the installation requirements of the water receiving box 300, without the need to modify the structure of the water heater body 100.

[0068] In some embodiments of this application, the water pump 410 is mounted on the fixed base 200. For example, the water pump 410 is fixed to the bottom of the fixed base 200 by means of screws or the like, making full use of the space between the fixed base 200 and the water receiving box 300, resulting in a compact structure.

[0069] Furthermore, when the water collection box 300 is removed from the mounting base 200 for cleaning or replacement, since the water pump 410 is fixed on the mounting base 200, the removal of the water collection box 300 will not involve the removal of the water pump 410, simplifying the removal process and avoiding the problem of reduced water pumping reliability caused by frequent contact with the water pump 410.

[0070] In some embodiments of this application, a recess is formed on the bottom plate 320 of the water receiving box 300, for example, the recess is a pit structure, and the water inlet of the water inlet branch pipe 420 is located in the recess.

[0071] The water receiving box 300 includes a base plate 320 and four circumferential side plates 330. A recess is provided on the base plate 320, which serves to collect water. The inlet of the water inlet branch pipe 420 is located in the recess, which helps to further improve the reliability of drainage.

[0072] In some embodiments of this application, the water receiving box 300 is detachably connected to the fixing base 200. For example, the water receiving box 300 is detachably connected to the fixing base 200 by means of buckles, screws, etc., so as to facilitate the cleaning and replacement of the water receiving box 300.

[0073] In some embodiments of this application, reference is made to Figure 2 and Figure 4 A notch 340 is provided on the circumferential wall 230 of the water receiving box 300, and the inlet pipe 120 and the outlet pipe 130 are directly opposite the notch 340.

[0074] The circumferential side plate 330 of the water receiving box 300 is connected to the fixing base 200, and a notch 340 is provided on the circumferential side plate 330 located on the back side of the water heater. The notch 340 provides sufficient pipe routing space for the installation of the inlet pipe 120 and the outlet pipe 130. In addition, when the water receiving box 300 is disassembled and installed in the horizontal direction, the notch 340 prevents the disassembly and installation of the water receiving box 300 from interfering with the inlet pipe 120 and the outlet pipe 130.

[0075] In some embodiments of this application, the water receiving box 300 is configured to move along a first horizontal direction to be mounted on the fixing base 200. The water receiving box 300 is also configured to move along a second horizontal direction to separate from the fixing base 200. The first horizontal direction and the second horizontal direction are opposite in direction.

[0076] Specifically, the first horizontal direction is the horizontal direction from front to back along the width of the water heater. When installing the water receiving box 300, the water receiving box 300 is pushed horizontally from front to back so that the water receiving box 300 is connected and fixed to the fixing base 200.

[0077] The second horizontal direction is the horizontal direction from back to front along the width of the water heater. When disassembling the water receiving box 300, pull the water receiving box 300 forward to separate the water receiving box 300 from the fixing base 200.

[0078] The water receiving box 300 is connected or separated from the fixed base 200 by sliding back and forth, which facilitates the assembly and disassembly of the water receiving box 300.

[0079] In some embodiments of this application, reference is made to Figure 6 The mounting base 200 includes a bottom wall 220 and a circumferential wall 230. The bottom wall 220 has a first opening 250 and a second opening 260. The inlet pipe 120 passes through the first opening 250, and the outlet pipe 130 passes through the second opening 260. The circumferential wall 230 has screw posts 240, which secure the mounting base 200 to the bottom of the water heater body 100 using screws.

[0080] Slots 210 are provided on two opposite outer side walls of the mounting base 200, and the slots 210 extend along the width direction of the mounting base 200. That is, slots 210 are provided on two opposite circumferential walls 230 extending along the width direction of the mounting base 200, and the slots 210 extend horizontally along the front-back direction of the water heater.

[0081] Insertion portions 310 are provided on two opposite inner sidewalls of the water receiving box 300, and the insertion portions 310 extend along the width direction of the water receiving box 300. That is, insertion portions 310 are provided on two opposite circumferential side plates 330 extending along the width direction of the water receiving box 300, and the insertion portions 310 extend along the front-back direction of the water heater.

[0082] The insertion part 310 is disposed in the slot 210, and the insertion part 310 can slide back and forth along the slot 210. The water receiving box 300 and the fixing base 200 are fixed through the insertion and engagement between the insertion part 310 and the slot 210.

[0083] In some embodiments of this application, reference is made to Figure 6A connecting rib 213 is provided on the slot 210, and a socket 211 is formed between the connecting rib 213 and the bottom of the slot 210. The socket 211 is located near the rear side of the fixing base 200.

[0084] Reference Figure 5 The insertion part 310 includes a first insertion part 311, which is inserted into the socket 211. The first insertion part 311 is a long strip-shaped protrusion structure, and the rear end of the first insertion part 311 is a tongue 313. When the water box 300 is pushed from front to back, the first insertion part 311 slides along the slot 210, and the rear end tongue 313 of the first insertion part 311 is inserted into the socket 211, and the water box 300 is pushed into place. Through the insertion between the first insertion part 311 and the socket 211, the connection reliability between the water box 300 and the fixing base 200 is improved.

[0085] In some embodiments of this application, reference is made to Figure 6 A first limiting part 212 is provided on the bottom of the slot 210. (Refer to...) Figure 5 The insertion part 310 includes a second insertion part 312, which is an elongated protruding structure. A second limiting part 314 is provided on the second insertion part 312. The first limiting part 212 cooperates with the second limiting part 314.

[0086] For example, the first limiting part 212 is a groove, and the second limiting part 314 is a protrusion, with the protrusion embedded in the groove. When the water receiving box 300 is pushed from front to back, the second insertion part 312 slides along the slot 210, the protrusion is embedded in the groove, and the water receiving box 300 is pushed into place. Through the cooperation between the first limiting part 212 and the second limiting part 314, the connection reliability between the water receiving box 300 and the fixing base 200 is improved.

[0087] In some embodiments of this application, reference is made to Figure 5 The insertion part 310 includes a first insertion part 311 and a second insertion part 312. Both the first insertion part 311 and the second insertion part 312 are elongated structures. The first insertion part 311 and the second insertion part 312 are spaced apart along the width direction of the water receiving box 300. The first insertion part 311 and the second insertion part 312 are inserted into the slot 210.

[0088] The rear end of the first insertion part is provided with a tongue 313, and the slot 210 is provided with a corresponding socket 211. The tongue 313 is inserted into the socket 211. The second insertion part 312 is provided with a second limiting part 314, and the slot 210 is provided with a corresponding first limiting part 212. The first limiting part 212 and the second limiting part 314 are engaged and locked together.

[0089] In some embodiments of this application, reference is made to Figure 4An indicator 350 is provided on the circumferential side plate 330 of the water receiving box 300. For example, the indicator 350 is an arrow to indicate the direction of disassembly and assembly of the water receiving box 300 to the user.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A water heater, comprising: The water heater body is provided with an inlet pipe and an outlet pipe, the inlet pipe is provided with a safety valve, and the safety valve is provided with a drain outlet. Its features are, The water heater also includes: A water collection box, configured to collect water flowing out of the drain outlet; The pumping unit is configured to pump water from the water receiving box to the water outlet pipe.

2. The water heater according to claim 1, characterized in that, The water heater also includes: A water level detection device, configured to detect the water level in the water receiving box; A controller configured to control the opening and closing of the pumping unit based on feedback data from the water level detection device.

3. The water heater according to claim 1, characterized in that, The pumping unit includes a water pump; the inlet of the water pump is connected to an inlet branch pipe, and the inlet of the inlet branch pipe is close to the bottom of the water receiving box; the outlet of the water pump is connected to an outlet branch pipe, and the outlet branch pipe is connected to the outlet pipe.

4. The water heater according to any one of claims 1 to 3, characterized in that, The water heater also includes a mounting base, which is located at the bottom of the water heater body. The inlet pipe and the outlet pipe pass through the mounting base, and the water receiving box is connected to the mounting base.

5. The water heater according to claim 4, characterized in that, The pumping unit is mounted on the fixed base.

6. The water heater according to claim 4, characterized in that, The water receiving box is detachably connected to the fixed base.

7. The water heater according to claim 6, characterized in that, The water receiving box is configured to move along a first horizontal direction to be installed on the fixed base, and the water receiving box is also configured to move along a second horizontal direction to separate from the fixed base; the first horizontal direction and the second horizontal direction are opposite in direction.

8. The water heater according to claim 6, characterized in that, The fixing base has slots on its two opposite outer side walls, and the slots extend along the width direction of the fixing base. The water receiving box has two opposite inner sidewalls with insertion parts that extend along the width of the water receiving box. The insertion part is disposed in the slot.

9. The water heater according to claim 8, characterized in that, The slot is provided with a connecting rib, and the connecting rib and the bottom of the slot form an insertion joint; The insertion part includes a first insertion part, which is inserted into the socket.

10. The water heater according to claim 8, characterized in that, A first limiting part is provided on the bottom of the slot; the insertion part includes a second insertion part, and a second limiting part is provided on the second insertion part; the first limiting part cooperates with the second limiting part.