Water heater shell and water heater

Abstract

The utility model relates to the technical field of water heaters, in particular to a water heater shell and a water heater, and the water heater shell comprises a bottom shell assembly, a water inlet assembly and a water outlet assembly, the mounting bottom plate is used for mounting working parts; the mounting bottom plate is positioned in the accommodating cavity; and the buffer assembly is arranged between the bottom shell assembly and the mounting bottom plate so as to buffer vibration generated between the bottom shell assembly and the mounting bottom plate. According to the embodiment of the utility model, the buffer assembly is arranged and is positioned between the bottom shell assembly and the mounting bottom plate, so that the mounting bottom plate and the bottom shell assembly are in a non-rigid connection state. When the mounting bottom plate vibrates, acting force is generated between the bottom shell assembly and the mounting bottom plate, and the buffer assembly can absorb certain vibration, so that a certain damping effect is achieved, the vibration amplitude is reduced, and the effect of reducing noise is achieved.

Description

Technical Field

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

[0002] At present, the noise of water heaters mainly comes from the vibrations generated by their internal components during operation. There are two main ways in which the vibrations are transmitted: one is through the air inlet channel, and the other is that the components drive the entire shell of the water heater to vibrate, which makes the water heater generate more noise during operation.

[0003] Generally, the shell mass can be increased by increasing the thickness and material density of the water heater shell, and at the same time, sound-absorbing materials such as sound-absorbing cotton are placed at appropriate locations inside the water heater shell. Sound-absorbing cotton can absorb and transform part of the sound wave energy, reduce internal noise reflection and resonance, and thus reduce the overall noise level, but the sound insulation effect is not ideal and the cost is high.

[0004] Therefore, the present technical solution provides a new sound insulation method to improve the sound insulation effect of the water heater. Utility Model Content

[0005] In view of this, the utility model provides a water heater casing and a water heater, thereby providing a new sound insulation method to improve the sound insulation effect of the water heater.

[0006] In a first aspect, the utility model provides a water heater casing, the water heater casing comprising:

[0007] A bottom shell assembly is provided with a receiving cavity;

[0008] A mounting base plate, used for mounting working parts; the mounting base plate is located in the accommodating cavity;

[0009] The buffer component is arranged between the bottom shell component and the mounting base plate to buffer the vibration generated between the bottom shell component and the mounting base plate.

[0010] Beneficial effect: When the user uses the water heater, the working parts of the water heater, such as the water pump, fan, etc., will vibrate. In this case, the working parts will directly transmit the vibration to the mounting base plate. If no buffer assembly is provided, the mounting base plate will transmit the vibration to the bottom shell assembly. When the bottom shell assembly vibrates, it will also drive the nearby air and spread the noise to the outside world. Therefore, the size of the noise is proportional to the vibration amplitude of the bottom shell assembly. The embodiment of the utility model provides a buffer assembly and locates the buffer assembly between the bottom shell assembly and the mounting base plate, so that the mounting base plate and the bottom shell assembly are in a non-rigid connection state. When the mounting base plate vibrates, the bottom shell assembly and the mounting base plate generate mutual force, and the buffer assembly will absorb a certain vibration, thereby having a certain damping effect, reducing the vibration amplitude, thereby achieving the effect of reducing noise.

[0011] In an optional embodiment, the buffer assembly includes:

[0012] A pair of end shock absorbing members are respectively arranged at the top and bottom of the installation base plate along the placement direction of the water heater casing;

[0013] A pair of side shock absorbing strips are respectively arranged on both sides of the installation bottom plate along the placement direction of the water heater casing;

[0014] The end shock absorbing parts and the side shock absorbing strips are both in contact with the mounting base plate and the bottom shell assembly.

[0015] Beneficial effect: The embodiment of the utility model can place the end shock-absorbing member on the main path of the water heater to transmit vibration by setting the end shock-absorbing member, thereby reducing the vibration of the water heater and further achieving the effect of reducing noise. At the same time, the embodiment of the utility model can also play a role in sealing the installation bottom plate and the bottom shell assembly by setting the side shock-absorbing strip, thereby ensuring the sealing of the internal air intake channel and ensuring the normal operation of the gas water heater.

[0016] In an optional embodiment, the end shock absorbers are respectively a top shock absorber and a bottom shock absorber, and the top shock absorber and the bottom shock absorber are arranged in the same or different structures.

[0017] In an optional embodiment, the end shock absorbing members and the side shock absorbing strips are rubber members.

[0018] In an optional embodiment, the mounting base plate and the bottom shell assembly surround each other to form a mounting gap suitable for mounting the buffer assembly, and the buffer assembly is arranged in the mounting gap.

[0019] Beneficial effect: The embodiment of the utility model can stably fix the buffer assembly between the mounting base plate and the bottom shell assembly by setting the mounting seam, ensuring that the buffer assembly will not be separated from the mounting base plate and the bottom shell assembly due to vibration during long-term use, ensuring that the water heater maintains a good shape and is in a normal working state during long-term use. In addition, the extrusion stress between the mounting base plate and the bottom shell assembly caused by long-term thermal expansion can be avoided to a certain extent, thereby protecting the mounting base plate and the bottom shell assembly from damage and maintaining the stability of the overall structure.

[0020] In an optional implementation, the width of the installation seam is between 2 mm and 5 mm.

[0021] Beneficial effect: The embodiment of the utility model adjusts the width of the installation seam to between 2mm and 5mm. Within this range, the internally arranged buffer component can just buffer the extrusion stress generated between the installation base plate and the bottom shell component due to vibration, thereby achieving the effect of reducing noise. At the same time, when the water heater is a gas water heater, within this range, it will not affect the area of ​​the air inlet channel, and can ensure the normal air intake demand of the gas water heater and ensure that the gas water heater can operate normally.

[0022] In an optional embodiment, the bottom shell assembly includes:

[0023] case;

[0024] The support plate is arranged on the top of the shell along the placement direction of the water heater casing to strengthen the structural strength of the top of the shell.

[0025] Beneficial effects: The embodiment of the utility model can disperse the gravity load borne by the installation base plate by providing a support plate, prevent deformation or damage of the installation base plate due to concentrated stress, ensure that the water heater maintains a good shape during long-term use, and reduce the risk of displacement or loosening caused by factors such as vibration, thermal expansion and contraction. In addition, the support plate, as a transition structure between the installation base plate and the shell, can absorb and transmit external shocks or vibrations, play a certain buffering and protective role for sensitive components inside the water heater, and reduce the probability of failure caused by external force impact. Furthermore, since the support plate itself is arranged on the top of the shell, the overall thickness of the top of the shell becomes thicker, so the structural strength of the top of the shell can be improved.

[0026] In an optional embodiment, the support plate is arranged on an end surface of the shell close to the mounting base plate, and the support plate is located between the shell and the buffer assembly.

[0027] Beneficial effects: The embodiment of the utility model can also absorb the vibration transmitted to the support plate through the buffer assembly by arranging the support plate between the shell and the buffer assembly, reduce the impact of the working parts on the support plate when vibrating, ensure that the water heater maintains a good shape during long-term use, and reduce the risk of displacement or loosening caused by factors such as vibration, thermal expansion and contraction. In addition, on the basis of the original shell top and support plate, a buffer assembly is further arranged on the top of the shell, which can also improve the structural strength of the shell top to a certain extent.

[0028] In an optional embodiment, the buffer component further includes:

[0029] A plurality of fixed shock-absorbing pads are arranged in the installation seam; a through hole is provided in the fixed shock-absorbing pad; a first limiting hole is provided on the installation bottom plate, and the first limiting hole is provided corresponding to the through hole; a second limiting hole is provided on the bottom shell assembly, and the second limiting hole is provided corresponding to the through hole;

[0030] The limiting screw passes through the first limiting hole, the through hole and the second limiting hole in sequence, thereby fixing the mounting base plate, the fixed shock-absorbing pad and the bottom shell assembly together.

[0031] Beneficial effects: The embodiment of the utility model provides a fixed shock-absorbing pad and a limit screw, and the limit screw can detachably connect the installation base plate and the bottom shell assembly, making the installation process simpler and faster. The limit screw connection allows for quick assembly and disassembly, which is convenient for later maintenance, replacement of parts or regular inspection. At the same time, the fixed shock-absorbing pad can seal the periphery of the limit screw, so that the fixed shock-absorbing pad can ensure the sealing of the internal air intake channel while also playing a certain shock-absorbing role.

[0032] In a second aspect, the utility model provides a water heater, comprising: a water heater casing as described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is an exploded schematic diagram of a water heater casing according to an embodiment of the utility model;

[0035] Figure 2It is a schematic diagram of the overall structure of the water heater casing and a partial cross-sectional view in the embodiment of the utility model;

[0036] Figure 3 for Figure 2 A is a partial enlarged schematic diagram;

[0037] Figure 4 for Figure 2 A partial enlarged schematic diagram of B in the middle;

[0038] Figure 5 It is a structural schematic diagram of installing the base plate in the embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 1. Install the base plate; 11. First limit hole;

[0041] 2. Buffer assembly; 21. Top shock absorber; 22. Bottom shock absorber; 23. Side shock absorber strip; 24. Limit screw; 25. Fixed shock absorber pad;

[0042] 3. Bottom shell assembly; 31. Shell; 311. Second limiting hole; 32. Support plate. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0044] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0045] According to an embodiment of the present utility model, on one hand, a water heater casing is provided, the water heater casing comprising a mounting base plate 1 , a buffer assembly 2 and a bottom casing assembly 3 .

[0046] Specifically, in the embodiment of the utility model, the mounting base plate 1 is used to mount working parts, such as water pumps, fans, etc. of the water heater. Further, in the embodiment of the utility model, the bottom shell component 3 is provided with a receiving cavity, the mounting base plate 1 is arranged in the receiving cavity, and the buffer component 2 is arranged between the bottom shell component 3 and the mounting base plate 1. The buffer component 2 can be in a strip-shaped structure, directly laid on the edge of the mounting base plate 1, or in a ring-shaped structure, and can also be directly laid on the edge of the mounting base plate 1. The buffer component 2 can correspond to the edge of the bottom shell component 3.

[0047] Since the buffer component 2 is present between the bottom shell component 3 and the mounting base plate 1 , the extrusion force generated by vibration can be buffered by the buffer component 2 .

[0048] With such a configuration, when the user uses the water heater, the working parts of the water heater, such as the water pump, the fan, etc., will vibrate. In this case, the working parts will directly transmit the vibration to the mounting base plate 1. If the buffer component 2 is not provided, the mounting base plate 1 will transmit the vibration to the bottom shell component 3. When the bottom shell component 3 vibrates, it will also drive the nearby air and spread the noise to the outside. Therefore, the size of the noise is proportional to the vibration amplitude of the bottom shell component 3. The embodiment of the utility model provides the buffer component 2, and makes the buffer component 2 located between the bottom shell component 3 and the mounting base plate 1, so that the mounting base plate 1 and the bottom shell component 3 are in a non-rigid connection state. When the mounting base plate 1 vibrates, the bottom shell component 3 and the mounting base plate 1 generate mutual force, and the buffer component 2 will absorb a certain vibration, thereby having a certain damping effect, reducing the vibration amplitude, thereby achieving the effect of reducing noise.

[0049] Further, in an optional embodiment, as Figure 1 As shown, the buffer assembly 2 includes a pair of end shock absorbing members and a pair of side shock absorbing strips 23. Specifically, in the embodiment of the utility model, along the placement direction of the water heater, a pair of end shock absorbing members are respectively arranged at the top and bottom of the installation base plate 1, so that the end shock absorbing members can buffer the top and bottom of the installation base plate 1 and the top and bottom of the bottom shell assembly 3.

[0050] Similarly, in the embodiment of the utility model, along the placement direction of the water heater casing, a pair of side damping strips 23 are respectively arranged on the left and right sides of the mounting base plate 1, so that the side damping strips 23 can buffer the side edges of the mounting base plate 1 and the side edges of the bottom shell assembly 3. The end damping parts and the side damping strips 23 are both in contact with the mounting base plate 1 and the bottom shell assembly 3.

[0051] In this way, after the bottom plate 1 is installed with components, the top and bottom positions are exactly the main stress points. The embodiment of the utility model can place the end shock absorbers on the main path of the water heater to transmit vibrations by setting the end shock absorbers, thereby reducing the vibration of the water heater and further achieving the effect of reducing noise. At the same time, the embodiment of the utility model sets the side shock absorber strips 23, which can not only play a certain shock absorbing role, but also play the role of sealing the bottom plate 1 and the bottom shell assembly 3, thereby ensuring the sealing of the internal air intake channel and ensuring that the gas water heater can operate normally.

[0052] Furthermore, in an optional embodiment, the end shock absorbers are respectively a top shock absorber 21 and a bottom shock absorber 22, and the top shock absorber 21 and the bottom shock absorber 22 are arranged in the same or different structures. That is, the shock absorber of the corresponding structure can be selected according to the components installed on the installation base plate 1. For example:

[0053] In order to ensure the same shock absorption effect at the top and bottom, the top shock absorber 21 and the bottom shock absorber 22 can be made into the same structure. However, in actual application, the working parts installed at different positions on the installation base plate 1 are inconsistent, so the vibration magnitudes at the top and bottom are not the same. Usually, the water heater will install the fan at the top, so in order to improve the shock absorption effect at the top, the top shock absorber 21 is thicker and larger in size than the bottom shock absorber 22, and the vibration absorption performance of the top shock absorber 21 is relatively better.

[0054] Furthermore, in an optional embodiment, the end shock absorbing member and the side shock absorbing strip 23 are rubber members. Of course, this embodiment is only an example of the material of the end shock absorbing member and the side shock absorbing strip 23, but it is not limited thereto, and those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0055] Further, in an optional embodiment, the mounting base plate 1 and the bottom shell component 3 surround to form a mounting gap suitable for mounting the buffer component 2, and the buffer component 2 is arranged in the mounting gap. In other words, a certain gap, i.e., the mounting gap, is reserved between the mounting base plate 1 and the bottom shell component 3 for mounting the buffer component 2, so that the buffer component 2 can buffer the extrusion force generated between the mounting base plate 1 and the bottom shell component 3 during vibration.

[0056] In this way, the embodiment of the utility model can stably fix the buffer assembly 2 between the installation base plate 1 and the bottom shell assembly 3 by setting the installation seam, ensuring that the buffer assembly 2 will not be separated from the installation base plate 1 and the bottom shell assembly 3 due to vibration during long-term use, ensuring that the water heater maintains a good shape and is in a normal working state during long-term use. In addition, the extrusion stress between the installation base plate 1 and the bottom shell assembly 3 caused by long-term thermal expansion can be avoided to a certain extent, thereby protecting the installation base plate 1 and the bottom shell assembly 3 from damage and maintaining the stability of the overall structure.

[0057] Furthermore, in an optional embodiment, the width of the installation seam is between 2 mm and 5 mm. In this way, the embodiment of the utility model sets the width of the installation seam between 2 mm and 5 mm. Within this range, the internally arranged buffer component 2 can just buffer the extrusion stress generated between the installation base plate 1 and the bottom shell component 3 due to vibration, thereby achieving the effect of reducing noise. At the same time, when the water heater is a gas water heater, within this range, it will not affect the area of ​​the air inlet channel, and can ensure the normal air intake demand of the gas water heater and ensure that the gas water heater can operate normally.

[0058] Further, in an optional embodiment, as Figure 1 As shown, the bottom shell assembly 3 includes a shell 31, and a receiving cavity is formed inside the shell 31, and the mounting base plate 1 is placed in the receiving cavity. The edge of the shell 31 completely overlaps with the edge of the mounting base plate 1.

[0059] Further, in an optional embodiment, as Figure 1 As shown, the bottom shell assembly 3 further includes a support plate 32 , and along the placement direction of the water heater casing, the support plate 32 is arranged on the top of the shell 31 .

[0060] In the embodiment of the utility model, the support plate 32 and the housing 31 can be fixedly connected or detachably connected. For the fixed connection, welding, bonding and the like can be used. For the detachable connection, screws and screw holes can be used for fixing, buckles and slots can be used for fixing, and magnetic sheets can be used for fixing.

[0061] The following is an example of a detachable connection method. For example, an additional fixing plate can be provided on the shell 31, and those skilled in the art can change the number of fixing plates according to actual conditions, such as 1, 2, 3, 4, etc., and then open a screw hole on the fixing plate, and then open another screw hole on the support plate 32 at the position corresponding to the screw hole, and then pass the screw through the screw hole on the fixing plate and the screw hole on the support plate 32 in sequence to connect the shell 31 with the support plate 32. Further, when fixing by means of buckles and slots, additional buckles can be provided around the edge of the shell 31, and those skilled in the art can change the number of buckles according to actual conditions, such as 1, 2, 3, 4, etc., and then open a slot on the support plate 32 corresponding to the position of the buckle that can cooperate with the buckle, and then the buckle on the shell 31 is directly embedded in the slot on the support plate 32, so as to connect the shell 31 with the support plate 32. When fixing by magnetic attraction, additional magnetic sheets can be arranged on the shell 31. The technicians in this field can change the number of magnetic sheets according to the actual situation, 1, 2, 3, 4, etc., and then open the opposite magnetic sheets that can be attracted to the magnetic sheets at the positions corresponding to the magnetic sheets on the support plate 32. Then, the magnetic sheets on the shell 31 are directly aligned with the opposite magnetic sheets embedded in the support plate 32, so that the shell 31 and the support plate 32 are magnetically connected.

[0062] Of course, this embodiment is only an example of a fixed connection method and a detachable connection method, but it is not limited to this. Those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0063] Further, in an optional embodiment, as Figure 3 As shown, the support plate 32 is arranged on the end surface of the shell 31 close to the mounting base plate 1 , and the support plate 32 is located between the shell 31 and the buffer assembly 2 .

[0064] Compared with the previous embodiment, in this embodiment, the position of the support plate 32 is changed so that the support plate 32 is arranged on the end surface of the housing 31 close to the mounting base plate 1. However, in order for the support plate 32 and the mounting base plate 1 to cooperate with each other to play a supporting role, the support plate 32 is provided with a bent portion on the side close to the mounting base plate 1, and the mounting base plate 1 is provided with a recessed portion that cooperates with the bent portion. When the support plate 32 and the mounting base plate 1 are installed, the bent portion of the support plate 32 can be directly inserted into the recessed portion, thereby achieving a stable connection. In addition, the support plate 32 and the mounting base plate 1 are provided with a buffer assembly 2 to absorb vibration to reduce noise.

[0065] In this way, the embodiment of the utility model can also absorb the vibration transmitted to the support plate 32 by setting the support plate 32 between the shell 31 and the buffer assembly 2, thereby reducing the impact of the working parts on the support plate 32 during vibration, ensuring that the water heater maintains a good shape during long-term use, and reducing the risk of displacement or loosening caused by factors such as vibration, thermal expansion and contraction. In addition, on the basis of the original top of the shell 31 and the support plate 32, the buffer assembly 2 is further set on the top of the shell 31, which can also improve the structural strength of the top of the shell 31 to a certain extent.

[0066] Further, in an optional embodiment, as Figure 3 and Figure 5 As shown, the buffer assembly 2 further includes a fixed shock-absorbing pad 25 , a first limiting hole 11 , a second limiting hole 311 and a limiting screw 24 .

[0067] Specifically, in the embodiment of the utility model, a plurality of fixed shock-absorbing pads 25 are arranged in the installation seam, and a through hole is provided in the fixed shock-absorbing pads 25. A plurality of first limiting holes 11 are provided on the installation base plate 1, and the first limiting holes 11 are provided corresponding to the through holes. A plurality of second limiting holes 311 are provided on the bottom shell assembly 3, and the second limiting holes 311 are provided corresponding to the through holes. After the limiting screws 24 pass through the first limiting holes 11, the through holes and the second limiting holes 311 in sequence, the installation base plate 1, the fixed shock-absorbing pads 25 and the bottom shell assembly 3 are fixed together. Thus, the fixed shock-absorbing pads 25, the end shock-absorbing parts and the side shock-absorbing strips 23 form a buffering and vibration-reducing structure together, thereby improving the shock-reducing effect.

[0068] In this way, the embodiment of the utility model is provided with a fixed shock-absorbing pad 25 and a limit screw 24, and the limit screw 24 can detachably connect the mounting base plate 1 and the bottom shell assembly 3, making the installation process simpler and faster. The limit screw 24 connection allows for quick assembly and disassembly, which is convenient for later maintenance, replacement of parts or regular inspection. At the same time, the fixed shock-absorbing pad 25 can seal the periphery of the limit screw 24, so the fixed shock-absorbing pad 25 can ensure the sealing of the internal air intake channel while also playing a certain shock-absorbing role.

[0069] In a second aspect, the utility model provides a water heater, comprising: a water heater casing as described in any one of the above embodiments.

[0070] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A water heater casing, characterized in that: include: A bottom shell assembly (3) is provided with a receiving cavity; A mounting base plate (1) for mounting working parts; the mounting base plate (1) is located in the accommodating cavity; A buffer component (2) is arranged between the bottom shell component (3) and the mounting base plate (1) to buffer vibrations generated between the bottom shell component (3) and the mounting base plate (1).

2. The water heater casing according to claim 1, characterized in that: The buffer component (2) comprises: A pair of end shock absorbing members are respectively arranged on the top and bottom of the installation base plate (1) along the placement direction of the water heater casing; A pair of side shock absorbing strips (23) are respectively arranged on both sides of the installation base plate (1) along the placement direction of the water heater casing; The end shock absorbing member and the side shock absorbing strip (23) are both in contact with the mounting base plate (1) and the bottom shell assembly (3).

3. The water heater casing according to claim 2, characterized in that: The end shock absorbing members are respectively a top shock absorbing member (21) and a bottom shock absorbing member (22); the top shock absorbing member (21) and the bottom shock absorbing member (22) are arranged in the same or different structures.

4. The water heater casing according to claim 3, characterized in that: The end shock absorbing member and the side shock absorbing strip (23) are rubber members.

5. The water heater casing according to any one of claims 1 to 4, characterized in that: The mounting base plate (1) and the bottom shell component (3) surround each other to form a mounting seam suitable for mounting the buffer component (2), and the buffer component (2) is arranged in the mounting seam.

6. The water heater casing according to claim 5, characterized in that: The width of the installation seam is between 2 mm and 5 mm.

7. The water heater casing according to any one of claims 1 to 4, characterized in that: The bottom shell assembly (3) comprises: Housing (31); A support plate (32) is arranged on the top of the shell (31) to strengthen the structural strength of the top of the shell (31).

8. The water heater casing according to claim 7, characterized in that: The support plate (32) is arranged on an end surface of the shell (31) close to the mounting base plate (1), and the support plate (32) is located between the shell (31) and the buffer assembly (2).

9. The water heater casing according to claim 6, characterized in that: The water heater casing also includes: A plurality of fixed shock-absorbing pads (25) are arranged in the installation seam; a through hole is provided in the fixed shock-absorbing pad (25); a first limiting hole (11) is provided on the installation base plate (1), and the first limiting hole (11) is arranged corresponding to the through hole; a second limiting hole (311) is provided on the bottom shell component (3), and the second limiting hole (311) is arranged corresponding to the through hole; The limiting screw (24) passes through the first limiting hole (11), the through hole and the second limiting hole (311) in sequence, thereby fixing the mounting base plate (1), the fixed shock-absorbing pad (25) and the bottom shell assembly (3) together.

10. A water heater, characterized in that: include: A water heater casing as claimed in any one of claims 1 to 9.

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