CN218096610U - Shell and gas water heater - Google Patents

Abstract

The utility model provides a casing and gas heater belongs to kitchen electricity technical field. The housing includes a face assembly and a bottom assembly assembled together. The bottom shell assembly includes a bottom housing and a perforated plate. The bottom shell comprises a bottom plate and a wall formed by vertically extending along the periphery of the bottom plate, and an air inlet is formed in the bottom plate and used for passing air. The perforated plate is arranged at the position of the air inlet in the bottom shell and is positioned on the surface, facing the face shell assembly, in the bottom shell and used for absorbing the peak value of low and medium frequency noise. The shell of the utility model forms a protective shell by the face shell component and the bottom shell component which are assembled together, so as to protect the product; the perforated plate is arranged at the front end of the air inlet of the bottom shell, and the perforated plate absorbs the peak value of low and medium frequency noise, so that the noise generated during the working of the gas water heater is reduced, and the noise pollution is reduced.

Description

Shell and gas water heater

Technical Field

The utility model relates to a kitchen electricity technical field, in particular to casing and gas heater.

Background

The gas water heater is also called as a gas water heater, and refers to a gas appliance which takes gas as fuel and transfers heat to cold water flowing through a heat exchanger in a combustion heating mode so as to achieve the purpose of preparing hot water.

With the improvement of living standard of people, the comfort of product use gradually becomes the pursuit target of users. For example, the noise of a gas water heater during use is used as a directly sensible performance index, and the noise level becomes an important factor for a user to determine the product quality. Therefore, how to effectively control the overall noise of the gas water heater at present becomes an important technical research direction in the heat burning industry.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a casing, this casing can effectively reduce the noise that gas heater during operation produced, noise abatement pollution.

An object of the utility model is also to provide a gas heater.

For realizing the purpose of the utility model, the utility model adopts the following technical proposal:

according to an aspect of the utility model, a casing is provided, this casing includes: the assembled face shell assembly is positioned on one side of the shell; and

a bottom shell assembly positioned in the housing on an opposite side of the face shell assembly, comprising:

the bottom shell comprises a bottom plate and a wall which is formed by vertically extending along the periphery of the bottom plate, and an air inlet is formed in the bottom plate and used for allowing air to pass through;

the perforated plate is arranged at the position of the air inlet in the bottom shell and positioned on the surface of the bottom shell facing the surface shell assembly and used for absorbing the peak value of low and medium frequency noise.

According to the utility model discloses an embodiment, wherein, the perforated plate is for having the panel of a plurality of holes, a plurality of holes are the law and arrange.

According to the utility model discloses an embodiment, wherein, air intake department configures into the cavity structure in the end casing, the bottom of cavity structure is equipped with many fresh air inlets, the perforated plate with the cavity structure cooperatees and forms the air cavity for the sound insulation, and then reduces the air noise of air intake department.

According to the utility model discloses an embodiment, wherein, the casing still include the air intake back plate, set up air intake position department in the end casing, and be located dorsad in the end casing the surface department of face-piece subassembly, the inside structure that sinks that is of air intake back plate, the bottom of structure that sinks is equipped with first air intake for the air inlet.

According to the utility model discloses an embodiment, wherein, the casing still include the flow distribution plate that admits air, set up in the perforated plate towards the surface department of face-piece subassembly, the flow distribution plate that admits air is inside to be the structure of sinking, the bottom of the structure of sinking is equipped with the second air intake, the second air intake with the air intake of end casing is dislocation arrangement, the second air intake is used for the air inlet.

According to an embodiment of the present invention, the air inlet of the bottom shell is configured as a chamber structure, and a plurality of air inlets are disposed inside the chamber structure;

the housing further includes:

the air inlet rear plate is arranged at the position of an air inlet in the bottom shell and is positioned on the surface, back to the face shell assembly, in the bottom shell, a sinking structure is arranged inside the air inlet rear plate, and a first air inlet is formed in the bottom of the sinking structure and used for air inlet;

the air inlet splitter plate is arranged on the surface, facing the face shell assembly, of the porous plate, a sinking structure is arranged inside the air inlet splitter plate, a second air inlet is formed in the bottom of the sinking structure, the second air inlet and the air inlet of the bottom shell are arranged in a staggered mode, and the second air inlet is used for air inlet;

wherein, the air intake back plate with the cavity structure cooperation forms first air cavity, the perforated plate with the cavity structure cooperation forms the second air cavity, the air intake flow distribution plate with the perforated plate cooperation forms the third air cavity, first air cavity the second air cavity with the third air cavity forms multilayer sound insulation cavity, and then has reduced the air noise of air intake department.

According to an embodiment of the present invention, the panel assembly is configured as a multi-layered composite sound insulation structure to reduce vibration between panels.

According to the utility model discloses an embodiment, wherein, the face-piece subassembly is including the front panel and the rear panel that stack formed, wherein, the front panel with the rear panel configures into the structure in middle part area space to form the air interlayer, and then weaken the front panel with vibration between the rear panel.

According to the utility model discloses an embodiment, wherein, the face-piece subassembly is including the front panel, rubber slab and the rear panel that the stack formed, through the rubber slab weakens the front panel with vibration between the rear panel.

According to the utility model discloses an embodiment, wherein, the face-piece subassembly with the junction of drain pan subassembly is equipped with the sealing strip for increase leakproofness, noise abatement outwards propagates.

According to an aspect of the utility model, a gas heater is provided, including aforementioned casing, still including installing water heater petticoat pipe fan, heat exchanger and combustor in the casing.

The utility model provides an embodiment has following advantage or beneficial effect:

the utility model discloses a casing constitutes the protective housing through face-piece subassembly and the drain pan subassembly that assembles together to protect the product. The perforated plate is arranged at the front end of the air inlet of the bottom shell, and the perforated plate absorbs the peak value of low and medium frequency noise, so that the noise generated during the working of the gas water heater is reduced, and the noise pollution is reduced.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic perspective view of a housing shown in accordance with an exemplary embodiment;

FIG. 2 is a schematic exploded view of a face shell assembly of a housing shown in accordance with an exemplary embodiment;

FIG. 3 isbase:Sub>A schematic cross-sectional view of the housing shown in FIG. 1 taken along section line A-A;

FIG. 4 is a bottom schematic perspective view of the housing according to an exemplary embodiment;

FIG. 5 is a schematic perspective view of a bottom housing of the housing shown assembled with an intake backplate in accordance with an exemplary embodiment;

FIG. 6 is a schematic perspective view of a bottom housing of the housing shown assembled with a porous plate and an intake manifold in accordance with an exemplary embodiment.

Wherein the reference numerals are as follows:

100. a shell body, a plurality of first connecting rods and a plurality of second connecting rods,

10. the surface shell component is provided with a surface shell component,

11. a rear panel 12, a rubber plate 13, a front panel,

20. a bottom shell component is arranged on the bottom shell component,

21. a bottom shell body is arranged on the bottom shell body,

211. a bottom shell main board 2111, mounting holes 2112, a chamber structure 2113 and a plurality of air inlet holes,

212. a bottom shell lower plate, 2121, a water heater air inlet, 2122, a water inlet, 2123 and a water outlet,

213. a bottom shell upper plate 2131 and an air outlet,

214. a support is arranged on the base, and the support is arranged on the support,

22. the number of the perforated plate, 221, well,

23. an air inlet flow distribution plate is arranged on the air inlet flow distribution plate,

231. a second air inlet is arranged at the first end of the air inlet,

24. the air inlet back plate is provided with an air inlet hole,

241. a sinking structure 242, a first air inlet,

25. a first air chamber is arranged in the first air cavity,

26. a second air chamber is arranged in the first air chamber,

27. a third air chamber.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1-6, fig. 1 is a schematic perspective view of a housing shown according to an exemplary embodiment. FIG. 2 is a schematic exploded view of a face housing assembly of a housing shown in accordance with an exemplary embodiment. Fig. 3 isbase:Sub>A schematic cross-sectional view of the housing according to fig. 1, taken along the section linebase:Sub>A-base:Sub>A. FIG. 4 is a bottom housing schematic perspective view of a housing shown in accordance with an exemplary embodiment. FIG. 5 is a schematic perspective view of a bottom housing of a housing shown assembled with an intake backplate according to an exemplary embodiment. FIG. 6 is a schematic perspective view of a bottom housing of the housing shown assembled with a porous plate and an intake manifold in accordance with an exemplary embodiment.

As shown in fig. 1, the housing 100 according to the embodiment of the present invention is used for a housing 100 of a gas water heater, and may be used as a housing 100 of other products. The housing 100 may generally include a face assembly 10 and a base assembly 20 assembled together. The panel assembly 10 is located at one side of the housing 100. The bottom chassis assembly 20 is located at the opposite side of the panel assembly 10 in the case 100. As shown in fig. 3, the bottom case assembly 20 includes a bottom case 21 and a perforated plate 22. As shown in fig. 4, the bottom case 21 includes a bottom plate (not shown) and a wall (not shown) extending vertically along the periphery of the bottom plate. An air inlet is arranged in the bottom plate and used for passing air. As shown in fig. 6, the porous plate 22 is provided in the bottom case 21 at the air intake position and at the surface of the bottom case 21 facing the face shell assembly 10, i.e., in the present embodiment, the porous plate 22 is located in front of the bottom case 21. The perforated plate 22 is used to absorb peaks of low and medium frequency noise.

As shown in fig. 3, the casing 100 of the present invention forms a protective casing by assembling the front casing assembly 10 and the bottom casing assembly 20 together, so as to protect the product. The perforated plate 22 is arranged at the front end of the air inlet of the bottom shell 21, and the perforated plate 22 absorbs peak values of low and medium frequency noises, so that the noises generated during the operation of the gas water heater are reduced, and the noise pollution is reduced.

In a preferred embodiment of the present invention, as shown in fig. 6, the perforated plate 22 is a plate with a plurality of holes 221, and the plurality of holes 221 are regularly arranged. In the embodiment, the perforated plate 22 is a plate-shaped material, and a plurality of holes 221 are uniformly distributed in the plate-shaped structure. The shape of the aperture 221 may be circular, square, diamond, oval, or other geometric shapes. The holes 221 may be arranged in a staggered manner, or in a matrix. In this embodiment, the holes 221 are preferably circular holes and arranged in a matrix.

Further, the perforated plate 22 preferably has a plate thickness of 1.5mm, a hole diameter of 2mm, and a perforation rate of 15%. Through experimental tests, the plate is 1 mm-3 mm thick, the aperture is 1.5 mm-3 mm, the perforation rate is 5% -15%, noise reduction is facilitated, and the plate is mainly used for absorbing peak values of low and medium-frequency noise.

In a specific implementation, as shown in fig. 4, the bottom case 21 is made of a sheet metal material or other plate-like materials. The bottom case 21 is functionally divided into different regions, and more specifically, the bottom case 21 is divided into a bottom main board 211, a bottom board 212, a bottom upper board 213 and a mounting bracket 214. Wherein, an air outlet 2131 is arranged at the upper plate 213 of the bottom shell. The bottom shell lower plate 212 is provided with a water heater air inlet 2121, a water inlet 2122, a water outlet 2123 and other installation positions. The bottom shell main board 211 is provided with a plurality of mounting holes 2111, and a smoke hood fan of the water heater, a heat exchanger, a burner or other parts are mounted for use.

In a preferred embodiment of the present invention, as shown in fig. 4, the air inlet of the bottom housing 21 is configured as a chamber structure 2112. More specifically, the chamber structure 2112 is provided at an upper position of the bottom chassis main board 211. The bottom of the chamber structure 2112 is provided with a plurality of air inlet holes 2113 for inlet air. Each of the plurality of air inlet openings 2113 can be longitudinally disposed or transversely disposed. The plurality of air inlet holes 2113 are preferably longitudinally and uniformly distributed or transversely and uniformly distributed. As shown in fig. 3, the perforated plate 22 cooperates with the chamber structure 2112 to form an air chamber for sound insulation, thereby reducing air noise at the air intake. The present embodiment also facilitates the mounting of the housing 100.

Preferably, in the present embodiment, the chamber structure 2112 of the bottom chassis main board 211 is disposed at the upper middle position. The depth of the chamber structure 2112 is preferably 10mm. Through experimental tests, the depth of the chamber structure 2112 may be 8mm to 15mm to avoid air entry difficulties due to too shallow an air cavity depth.

In a preferred embodiment of the present invention, as shown in fig. 1, the housing 100 further includes an intake back plate 24. The intake back plate 24 is provided at an intake opening position in the bottom case 21 and at a surface of the bottom case 21 facing away from the face housing assembly 10, i.e., the intake back plate 24 is located at a rear end of the bottom case 21. The air intake back plate 24 is internally provided with a sinking structure 241, and the bottom of the sinking structure 241 is provided with a first air inlet 242 for air intake.

During the concrete implementation, the air inlet hole area of first air intake 242 and drain pan mainboard 211 of this patent all is greater than air exit 2131 total area to avoid inlet air channel to diminish and cause the air to flow into not smooth, influence gas heater's gas normal combustion.

More specifically, as shown in fig. 5, in the present embodiment, the intake back plate 24 is a plate-shaped material, the inner portion is a sinking structure 241, and a sinking single-side opening is arranged at the sinking structure 241. Only the sinking single-sided port is flush with the sinking position, and the sinking single-sided port forms a first air inlet 242. The intake back plate 24 is mounted to the back of the chamber structure 2112 of the bottom chassis main plate 211, and the intake back plate 24 and the bottom case 21 are mounted to form a first air chamber 25.

In a preferred embodiment of the present invention, as shown in fig. 3, the housing 100 further includes an intake manifold 23. The intake manifold 23 is provided at a surface of the perforated plate 22 facing the face housing assembly 10, i.e., the intake manifold 23 is located at a front end of the perforated plate 22. As shown in fig. 6, the intake manifold 23 has a depressed structure inside. The bottom of the sinking structure is provided with a second air inlet 231. The second air inlet 231 and the air inlet of the bottom housing 21 are arranged in a staggered manner. The second air inlet 231 is used for air inlet.

More specifically, as shown in fig. 6, the air inlet splitter plate 23 is made of a plate-shaped material, and the second air inlets 231 are of a louver structure and are symmetrical to both sides of the center line of the air inlet splitter plate 23. The strip-shaped shutters can be longitudinally and uniformly distributed or transversely uniformly distributed. The intake air flow distribution plate 23 is installed in front of the porous plate 22, and the sinking surface of the intake air flow distribution plate 23 faces away from the porous plate 22. The perforated plate 22 is fixed to the front surface of the bottom case main plate 211 together with the intake manifold 23 by screws.

In specific implementation, the sum of the areas of the two second air inlets 231 is greater than the total area of the air outlet 2131, so that the problem that the air inflow is not smooth due to the fact that the air inlet channel is small and the normal combustion of the gas water heater is influenced is avoided.

In a preferred embodiment of the present invention, as shown in fig. 3, the difference between the present embodiment and the above embodiments is that the bottom case assembly 20 includes a bottom case 21, a perforated plate 22, an intake manifold 23, and an intake back plate 24. The perforated plate 22, the air inlet flow distribution plate 23 and the air inlet rear plate 24 are all arranged at the air inlet position of the bottom shell 21. The specific structures of the intake back plate 24 and the intake flow dividing plate 23 are the same as those of the previous embodiments, and the details of the embodiment having the same structures are omitted. Wherein, the air inlet rear plate 24 and the chamber structure 2112 are matched to form a first air chamber 25, the porous plate 22 and the chamber structure 2112 are matched to form a second air chamber 26, and the air inlet flow distribution plate 23 and the porous plate 22 are matched to form a third air chamber 27. In this embodiment, air required for combustion of the gas water heater enters the first air chamber 25 through the first air inlet 242, passes through the plurality of air inlet holes 2113 to the second air chamber 26, enters the third air chamber 27 through the second air chamber 26 and the porous structure of the porous plate 22, and then enters the bottom housing 21 through the two second air inlets 231. Wherein, first air cavity 25, second air cavity 26 and third air cavity 27 form multilayer sound insulation cavity, and then reduced the effective steam flow noise that reduces the air intake. Air required by the water heater enters from the air inlet cavity, waste gas generated by combustion is discharged from the air outlet 2131, and after the bottom shell assembly 20 and the face shell assembly 10 are combined, noise generated during the working of the gas water heater can be effectively reduced, and household noise pollution is reduced.

In a preferred embodiment of the present invention, as shown in fig. 1, the panel housing assembly 10 is configured as a multi-layered composite panel acoustical structure to dampen inter-panel vibration.

In a preferred embodiment of the present invention, referring to fig. 1, the panel housing assembly 10 is stacked to include a front panel 13 and a rear panel 11. The front panel 13 and the rear panel 11 are configured to be a structure with a gap in the middle, the front panel 13 and the rear panel 11 are connected together by glue or other fixing methods, and a double-layer sound insulation structure is formed after the connection, so that the vibration between the front panel 13 and the rear panel 11 is weakened. The front panel 13 and the rear panel 11 can be made of materials with different thicknesses and different rigidities so as to improve the sound insulation performance.

In a preferred embodiment of the present invention, as shown in fig. 2, the panel assembly 10 is a multi-layer plate structure, and is stacked to form a multi-layer composite-plate sound insulation structure. The panel assembly 10 includes a front panel 13, a rubber sheet 12, and a rear panel 11. The rubber sheet 12 is configured to attenuate vibration between the front panel 13 and the rear panel 11. The rubber plate 12 is a loose and soft rubber plate 12, and the soft and hard combination can better play a role in sound insulation.

In a specific implementation, as shown in fig. 2, the front panel 13 may be made of glass or other plate-like materials. The rear panel 11 may be a sheet metal material or other plate-like material. The rubber plate 12 is positioned between the front panel 13 and the rear panel 11 and is sticky rubber, so that the front panel 13 and the rear panel 11 are connected together to form a multilayer composite board sound insulation structure after connection.

In a preferred embodiment of the present invention, referring to fig. 2, the front panel 13, the rubber sheet 12 and the rear panel 11 of the panel assembly 10, a sealing material may be added to the inside of each panel to further improve the sound insulation effect.

In a preferred embodiment of the present invention, as shown in fig. 1, a sealing strip is disposed at the joint of the face component 10 and the bottom component 20 for increasing the sealing performance between the face component 10 and the bottom component 20. Reducing the outward transmission of noise.

Referring to fig. 1, the gas water heater of the embodiment of the present invention includes the aforementioned casing 100, and further includes a water heater hood fan, a heat exchanger and a burner installed in the casing 100.

In this embodiment, after the face shell assembly 10 and the bottom shell assembly 20 are mounted and fixed, an acoustic hood structure is formed to enclose combustion noise, water noise and airflow noise inside the gas water heater in a relatively small space, so as to effectively reduce radiation of the noise source to the surrounding environment.

In embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" are used for indicating the position or the positional relationship based on the position or the positional relationship shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but not for indicating or implying that the indicated device or unit must have a specific direction, be constructed and operated in a specific position, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the description of the terms "one embodiment," "a preferred embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims (11)

1. A housing, comprising: assembled together

A panel housing assembly (10) located at one side of the housing (100); and

a bottom shell assembly (20) located in the housing (100) on an opposite side of the face shell assembly (10), comprising:

the bottom shell (21) comprises a bottom plate and a wall formed by vertically extending along the periphery of the bottom plate, and an air inlet is formed in the bottom plate and used for allowing air to pass through;

and the porous plate (22) is arranged at the position of an air inlet in the bottom shell (21) and is positioned on the surface, facing the face shell assembly (10), in the bottom shell (21) and used for absorbing the peak value of low and medium frequency noise.

2. The housing according to claim 1, characterized in that the perforated plate (22) is a plate with a plurality of holes, which are regularly arranged.

3. The housing according to claim 1, characterized in that a chamber structure (2112) is arranged at the air inlet in the bottom housing (21), a plurality of air inlet holes (2113) are arranged at the bottom of the chamber structure (2112), and the porous plate (22) and the chamber structure (2112) are matched to form an air chamber for sound insulation and further reduce air noise at the air inlet.

4. The shell of claim 1, further comprising an intake back plate (24) disposed at an intake position in the bottom shell (21) and located at a surface of the bottom shell (21) facing away from the face shell assembly (10), wherein a sunken structure (241) is inside the intake back plate (24), and a first intake (242) is disposed at a bottom of the sunken structure (241) for intake air.

5. The shell of claim 1, further comprising an intake air dividing plate (23) disposed at a surface of the porous plate (22) facing the face shell assembly (10), wherein a sinking structure is disposed inside the intake air dividing plate (23), a second intake port (231) is disposed at a bottom of the sinking structure, the second intake port (231) and the intake port of the bottom shell (21) are arranged in a staggered manner, and the second intake port (231) is used for intake air.

6. The housing according to claim 1, characterized in that the air inlet in the bottom housing (21) is configured as a chamber structure (2112), and a plurality of air inlet holes (2113) are arranged in the chamber structure (2112);

the housing (100) further comprises:

the rear air inlet plate (24) is arranged at an air inlet position in the bottom shell (21) and is positioned on the surface, back to the face shell assembly (10), in the bottom shell (21), a sinking structure (241) is arranged inside the rear air inlet plate (24), and a first air inlet (242) is formed in the bottom of the sinking structure (241) and used for inlet air;

the air inlet splitter plate (23) is arranged on the surface, facing the face shell assembly (10), of the porous plate (22), a sinking structure is arranged inside the air inlet splitter plate (23), a second air inlet (231) is formed in the bottom of the sinking structure, the second air inlet (231) and an air inlet of the bottom shell (21) are arranged in a staggered mode, and the second air inlet (231) is used for air inlet;

wherein, air intake back plate (24) with cavity structure (2112) cooperation forms first air chamber (25), perforated plate (22) with cavity structure (2112) cooperation forms second air chamber (26), admit air flow distribution plate (23) with perforated plate (22) cooperation forms third air chamber (27), first air chamber (25), second air chamber (26) and third air chamber (27) form multilayer sound insulation cavity, and then reduced the air noise of air intake department.

7. A housing according to claim 1, characterized in that the panel shell assembly (10) is configured as a multilayer composite panel acoustical structure to dampen inter-panel vibrations.

8. The housing according to claim 7, wherein the panel assembly (10) comprises a front panel (13) and a rear panel which are stacked, wherein the front panel (13) and the rear panel (11) are configured in a structure with a gap in the middle to form an air barrier to reduce the vibration between the front panel (13) and the rear panel (11).

9. The housing according to claim 7, characterized in that the face shell assembly (10) comprises a front panel (13), a rubber plate (12) and a rear panel (11) which are superimposed, and the vibration between the front panel (13) and the rear panel (11) is attenuated by the rubber plate (12).

10. The housing according to claim 1, wherein the junction of the face assembly (10) and the bottom assembly (20) is provided with a sealing strip for increasing sealing performance and reducing outward transmission of noise.

11. A gas fired water heater comprising a housing (100) according to any one of claims 1 to 10 and further comprising a water heater hood fan, heat exchanger and burner mounted in the housing (100).

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