[001] The present subject matter described herein, relates to the technical field of induction water heating. The present subject matter, in particularly, relates to an induction coil water heater with insulation cover, having low energy consumption in standing loss test. The present subject matter further relates to an induction coil water heater wherein the insulation cover provides heat insulation to both insulation coil and tank assembly containing water.
BACKGROUND AND PRIOR ART AND PROBLEM IN PRIOR ART:
[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[003] Generally, water heaters based on element heating is used in household. In heating element based water heaters, the heating element is provided inside the tank containing water. Water is heated by the heating element which is in direct contact with the water inside the tank. Mostly, heat lost occurs from three areas i.e. from top of the water tank, bottom of the water tank and cylindrical surface of the tank. Traditionally, insulation is provided on the top side of the tank and cylindrical side of the tank. It is easier to provide this insulation on the cylindrical side of the tank, since the heating element is inside the tank.
[004] In induction based water heater, the coil is kept outside the tank alongside the wall of the tank instead of inside the tank in direct contact with water. It is not possible to insulate the tank when the induction coil is present outside the tank as the polyurethane foam (PUF) provided for insulation is susceptible to burn. This is the foremost reason of low efficiency of induction coil water heaters.
[005] Chinese patent application CN206207737U relates to a household water heater of external coil pipe of layering heat accumulation formula, the water heater comprising a water tank, the inner tank of the water tank is provided with a

water tank liner, and the water tank liner is provided with a water tank partition, the water tank is divided into a high temperature water tank, a medium temperature water tank, and a low temperature water tank from top to bottom; the outer wall of the water tank inner liner has a medium heat exchange coil, the outer wall of the medium heat exchange coil is surrounded by a high-temperature emitting film, and a thermal insulating foam is injected into the outer casing to form an insulating layer cavity; The medium heat exchange coil on the high temperature water tank side is provided with a high temperature medium inlet, and the medium heat exchange coil on the low temperature water tank side is provided with a low temperature medium outlet. A liquid storage tank, a filter, a throttle, an evaporator, and a branch are sequentially connected between the low temperature medium outlet and the high temperature medium inlet through a pipeline. The liquid filter and the compressor; the evaporator side is provided with a fan.
[006] Chinese patent CN206347728U relates to an electric water heater specifically a high-efficiency energy-saving electric water heater, which comprises a casing, an inner casing is arranged inside the casing, and a polyurethane hair is arranged between a bottom surface of the inner casing and an inner bottom surface of the outer casing, a foam layer, characterized in that: an upper surface of the outer casing is provided with an electromagnetic controller, an opening is provided at the center of the upper surface of the outer casing, and a sealing device is arranged at the opening an induction coil cavity is provided in the sealing device, the sealing device comprising an upper sealing plate, a supporting plate and a lower sealing plate, The surface of the upper sealing plate is provided with a through hole located at the bottom surface of the upper sealing plate, the bottom surface of the supporting plate, the lower sealing plate and the upper surface is connected, the lower sealing plate extends to the upper surface of the inner casing, the upper surface of the inner casing is provided with an opening, and the surface of the lower sealing plate is provided with a wire hole, the bottom surface of the lower sealing plate is provided with a left and right symmetrical mounting rod, and the bottom end of the mounting rod passes through an opening of the upper surface and extending into the inner cavity of the inner casing, the

mounting rod has two, and the bottom ends of the two mounting rods are vertically provided with connecting rods. There are two connecting rods, and a feeding tube is arranged between the two connecting rods. The surface of the material tube is provided with an induction coil and an induction coil Electrically connected to the electromagnetic controller.
[007] Chinese patent CN203224027U discloses an energy-saving variable-frequency water heater, wherein a water tank is an enamel water tank, a magnetic flux induction coil with the circular diameter is fixedly sleeved on one end of the enamel water tank, insulating paint is coated on the exterior of the coil, two outgoing lines of the coil are connected with an electronic control box, and the electronic control box is connected with an alternating current power supply. The energy-saving variable-frequency water heater disclosed by the utility model has the advantages of high heat conversion efficiency, long service life, safety and reliability.
[008] Chinese Patent CN203757994U relates to a water heater with the water-electricity-separating electromagnetic heating function. A water inlet pipe and a water outlet pipe are installed on a shell and communicated with a nonmetal inner container. An installation cavity is formed in the portion, below the nonmetal inner container, in the shell. An electromagnetic heating sheet is fixed to the inner side of the bottom of the nonmetal inner container. A wire coil is fixed to the outer side of the portion, under the electromagnetic heating sheet, of the bottom of the nonmetal inner container. An air inlet and an air outlet for convection are formed in the portions, on the two sides of the installation cavity, of the shell. A cooling fan is fixed to the inner side of the air inlet. A circuit board is installed in the installation cavity between the air inlet and the air outlet. A circulating water pump is arranged in the shell and connected with a water pump water inlet pipe and a water pump water outlet pipe, the water pump water inlet pipe is connected to the bottom of the nonmetal inner container, and the water pump water outlet pipe is connected to the upper half portion of the nonmetal inner container. According to the water heater with the structure, the wire coil generates a

magnetic field to electromagnetically heat the electromagnetic heating sheet, and therefore water-electricity separation is really achieved and electricity leakage is avoided.
[009] There is no induction water heater disclosed in the prior arts having design wherein insulation is provided adjacent to the induction coil, without it being getting burned. Further, none of the prior arts cited above disclose an induction water heater having outer module easily removable for maintenance.
[0010] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
OBJECTS OF THE INVENTION:
[0011] It is therefore the object of the present subject matter to overcome the aforementioned and other drawbacks in prior method/product/apparatus.
[0012] The principal objective of the present subject matter is to develop an induction coil water heater with an insulation cover.
[0013] Another object of the present subject matter is to develop an induction coil water heater wherein outer module is easily removable to ensure easy maintenance.
[0014] Another object of the present subject matter is to develop an induction coil water heater wherein the insulation material cover both the tank and the electric coil.
[0015] Another object of the present subject matter is to develop an induction coil water heater wherein the insulation coil is outside the tank and does not comes in contact with water.
[0016] Yet another object of the present subject matter is to develop an induction coil water heater having a gap between induction coil and tank.

[0017] Yet another object of the present subject matter is to develop an induction coil water heater in which while maintenance insulation material is not ruined.
[0018] Yet another object of the present subject matter is to develop an induction coil water heater which uses eddy current to heat the water inside the tank.
[0019] Yet another object of the present subject matter is to develop an induction coil water heater with 5-star rating.
[0020] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.
SUMMARY OF THE INVENTION:
[0021] Solution to one or more drawbacks of existing induction coil water heater, and additional advantages are provided through the present induction coil water heater as disclosed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.
[0022] According to one of the embodiment of the present subject matter which discloses an induction coil water heater with insulation cover, the induction coil water heater includes a tank assembly, a back cover to cover back side of the tank, a single module to provide heat to the tank and simultaneously insulate the tank, a front cover sub-assembly to accommodate the single module, and a polyurethane foam (PUF) blocker to cut off heat loss from the bottom of the tank, covered by bottom service cover.
[0023] In an aspect, the single module includes a coil assembly having an induction coil used to heat the water in the tank assembly and a frame having concave curvature similar to the curvature of the tank assembly, wherein the frame has protrusions provided on the front side, in conformity with the shape of the induction coil, to accommodate the induction coil. Further, the single module

includes a sub-unit to cover the tank assembly and the coil assembly having a ferrite holder with a concave curvature similar to the tank assembly and the induction coil assembly, wherein a plurality of supporting frames is provided on the front side of the ferrite holder and a plurality of bosses is provided on the respective right and left sides of the ferrite holder and a mounting frame having a protrusion on its front side to accommodate a fan for cooling and provision is provided to accommodate main PCB, wherein a plurality of bosses is provided on the respective right and left sides of the mounting frame. The sub-unit assembly is formed by fastening the plurality of bosses provided on the ferrite holder and the mounting frame in a way that both the ends of the ferrite holder are affixed to the respective ends of the mounting frame and middle of the ferrite holder is linked with a structure provided in the middle of the mounting frame which divides the sub-unit into two halves.
[0024] In an aspect, the single module is formed by fastening the plurality of bosses provided on the frame of the coil assembly and the sub-unit assembly using screws and/or nut and bolt combination.
[0025] In an aspect, the plurality of support frames provided on the front side of the ferrite holder accommodates a plurality of ferrites which cutoff heat flow towards injected PUF.
[0026] In an aspect, a plurality of holes is provided on front side of the mounting frame to inject polyurethane foam (PUF) into each half of the sub-unit assembly.
[0027] In an aspect, ribs are provided on the inner surface of the mounting frame to provide stiffness in order to avoid bulge in the assembly due to pressure exerted by the injected PUF.
[0028] In an aspect, the ferrite holder has continuous extended frame around its perimeter to stop leakage of PUF liquid outside the single module.
[0029] In an aspect, a plurality of stoppers is provided on top and bottom end of the frame of the coil assembly to maintain a gap between the tank and the induction coil.

[0030] In an aspect, the front cover sub-assembly comprises a front PUF blocker to cutoff heat loss from front side of the tank, and a front cover having a slot in the middle to accommodate the front PUF blocker.
[0031] In an aspect, the front PUF blocker is in the shape of a hollow rectangle with its top and bottom side having curvature similar to the tank and width of the PUF blocker is identical to the width of the tank.
[0032] In an aspect, provisions are provided on the front cover to fasten the front PUF blocker and the single module.
[0033] In an aspect, the single module is easily removable by unfastening the plurality of screws, for maintenance purpose, without damaging the PUF surrounding the single module.
[0034] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0036] Fig. 1 illustrates exploded view of induction coil water heater according to one of the embodiments of the present subject matter;

[0037] Fig. 2 illustrates single module of the induction coil water heater according to one of the embodiment of present subject matter;
[0038] Fig. 3 illustrates induction coil water heater assembly structure with stoppers according to one of the embodiments of present subject matter;
[0039] Fig. 4 illustrates front cover sub-assembly of the induction coil water heater according to one of the embodiment of present subject matter; and
[0040] Fig. 5a and 5b illustrates frame of the induction coil assembly and the induction coil respectively, according to one of the embodiment of present subject matter.
[0041] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0042] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0043] The terms "comprises", "comprising", or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by "comprises... a" does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.

[0044] Referring to figure 1, 2 & 4, illustrating exploded view of induction coil water heater 100 according to one of the embodiments of the present subject matter. The induction coil water heater 100 has a tank assembly 101 provided with an inlet to introduce cold water into the tank assembly 100, and an outlet to withdraw hot water out of the tank assembly 100. A back cover 102 is provided on the back side of the tank assembly 101 to cover the tank assembly 101. Further, a single module 207 is provided to heat the tank assembly 101 and simultaneously insulate the tank assembly 101. The single module 207 is a consolidation of an induction coil assembly 103 and a sub-unit 205. A front cover sub-assembly 401 is provided to accommodate the single module 207 in front side of the tank assembly 101. The front cover sub-assembly 401 is a consolidation of a front PUF blocker 107 and a front cover 106. A bottom PUF blocker 108 covered with a bottom service cover 109 is provided to cut off heat loss from the bottom of the tank assembly 101.
[0045] Referring to figure 2 illustrating single module of the induction coil water heater according to one of the embodiment of present subject matter. The induction coil assembly 103 of the single module 207 includes a frame 501 with concave curvature similar to the curvature of the tank assembly 101. The frame 501 has protrusions provided on its front side. These Protrusions are provided in conformity with the shape of the induction coil 502. The protrusions provided on the front surface of the frame 501 accommodates the induction coil 502 in a way that no extra provision is provided on the frame 501 to fix the induction coil 502. The coil assembly 103 formed by consolidating the frame 501 and the induction coil 502 is used to induce eddy current in the tank assembly 101 containing water. This eddy current generates heat in the tank assembly 101 and heat the water contained in the tank assembly 101. A thermostat is provided in the tank assembly 101 to cut off the power supply to the induction coil 502, once the water is heated to a predetermined temperature.
[0046] The sub-unit assembly 205 includes a ferrite holder 104 and a mounting frame 105. The sub-unit assembly 205 covers the coil assembly 103 and the tank

assembly 101 from the front side. The ferrite holder 104 has a concave curvature similar to the tank assembly 101 and the coil assembly 103. The inner side of the ferrite holder 104 is towards the coil assembly 103, in a way that, induction coil 502 is never in contact with the inner side of the ferrite holder 104 due to the existence of the protrusions on the frame 501 of the coil assembly 103. At the front side of the ferrite holder 104, a plurality of supporting frames 202 is provided to accommodate a plurality of ferrites. A supporting frame 204 is also provided in the middle.
[0047] The mounting frame 105 is a 'C shaped frame of suitable material used to cover the tank assembly 101 and the coil assembly 103. The mounting frame 105 has a structure 208 provided in the middle to link with the supporting frame 204 provided in the middle of the ferrite holder 104. Both the mounting frame 105 and the ferrite holder 104 has a plurality of bosses 206a on their respective right and left side. A sub-unit assembly 205 is formed by fastening the plurality of bosses206a provided on the ferrite holder 104 and the mounting frame 105. In the formed sub-unit assembly 205, both the ends of the ferrite holder 104 are affixed to the respective end of the mounting frame 105 and middle of the ferrite holder 104 is linked with the structure 208 provided in the middle, on the inner side, of the mounting frame 105. The linking of middle portion of the ferrite holder 104 and the mounting frame 105 divides the sub-unit into two halves (301a, 301b).
[0048] The front side of the mounting frame 105 is provided with protrusion to accommodate a fan for cooling and also provision is provided to accommodate the main Printed Circuit Board (PCB). A plurality of holes 201 is provided on front side of the mounting frame 105 to inject polyurethane foam (PUF) into each half of the sub-unit assembly 205. The liquid polyurethane foam (PUF) is injected into the assembly 205 which forms a solid layer of polyurethane foam (PUF) between the mounting frame 105 and the ferrite holder 104. The advantage of using liquid polyurethane foam (PUF) is that it forms a layer, on hard to reach portions, between the mounting frame 105 and the ferrite holder 104 which in turn provides

better insulation to the tank assembly 101 and the coil assembly 103, than pre-formed polyurethane foam (PUF).
[0049] When liquid polyurethane foam (PUF) is solidified between the mounting frame 105 and the ferrite holder 104, the polyurethane foam (PUF) exerts pressure on the mounting frame 105 and the ferrite holder 104. To avoid forming any bulge due to pressure exerted by the polyurethane foam (PUF), ribs 302 are provided on the inner surface of the mounting frame 105 to provide stiffness.
[0050] Further, the ferrite holder 104 has continuous extended frame 203 around its perimeter to stop leakage of liquid polyurethane foam (PUF) outside the single module 207.
[0051] Ferrites are accommodated on the supporting frames 202 provided on the front side of the ferrite holder 104. Ferrites on these supporting frames 202 cut off the heat flow towards outside and keep the heat flow towards the tank assembly 101. This reduces the heat loss and enhance the overall rating of the induction coil water heater 100.
[0052] A plurality of stoppers 303 is provided on top and bottom end of the frame 501 of the coil assembly 103 to maintain a gap between the tank assembly 101 and the induction coil 502.
[0053] The single module 207 is formed by fastening the plurality of bosses 206a, 206b provided on the frame 501 of the coil assembly 103 and the sub-unit assembly 205 using screws and/or nut and bolt combination.
[0054] Referring to figure 4, illustrating front cover sub-assembly 401 of the induction coil water heater according to one of the embodiment of present subject matter. The front cover sub-assembly 401 includes a front PUF blocker 107 and a front cover 106 having a slot in the middle. The front PUF blocker 107 is in the shape of a hollow rectangle with its top and bottom side having a curvature similar to the tank assembly 101 and width of the front PUF blocker 107 is identical to the width of the tank assembly 101. The front PUF blocker 107 is fitted in the slot provided on the front cover 106. The front cover 106 also

accommodates the single module 207 in the slot. Provisions are provided on the front cover 106 to fasten the front PUF blocker 107 and the single module 207.
[0055] The single module 207 and the front cover sub-assembly 401 is further covered with service cover 110 and trim 111. A display 114 is provided in connection with the Printed Circuit Board (PCB) 113 to display various parameters of the induction coil water heater 100.
[0056] Water is introduced in the water tank assembly 101 through inlet provided in the tank assembly 101. The induction coil 502 provided outside the tank assembly 101 induce eddy current in the tank assembly 101 containing water. The heating effect of eddy current increase the temperature of the water. This increase in temperature of the water is continued until the temperature reaches a cut off value. Thermostat provided in the tank 101 take a note of temperature and cut of the power supply to the induction coil 502 when the predetermined cut off value is reached. The insulation provided in the induction coil water heater 100 does not let heat to flow into the surrounding, instead, the ferrites provided in the single module restrict the heat flow towards surrounding and keep the heat flow towards the tank assembly 101. This improves the standing heat losses of the induction coil water heater 100. Water is taken out from the tank 101 through outlet and new cold water enters the tank assembly 101. As the temperature of the tank 101 decreases below the cut off value due to the introduction of cold water into the tank assembly 101, the thermostat again establishes the power supply to the induction coil 502 and the whole process starts again.
[0057] The induction coil water heater 100 according to the present subject matter improves the standing losses by reducing the heat loss to the surrounding. Unlike presently available induction coil water heater, the single module is easily removable in present induction coil water heater 100 without damaging the insulation i.e. polyurethane foam (PUF). Further, in present induction coil water heater, insulation is provided on top of the tank, bottom of the tank and around the tank. This is not the case with presently available induction coil water heater as insulation cannot be provided in them because coil is placed outside the tank.

[0058] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least

one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
[0059] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of "comprising" or "including" also contemplates embodiments that "consist essentially of or "consist of the recited feature.

We claim:

An induction coil water heater (100) with insulation cover, the induction coil water heater (100) comprises:
a tank assembly (101);
a back cover (102) to cover the back side of the tank assembly (101);
a single module (207) to provide heat to the tank assembly (101) and simultaneously insulate the tank assembly 101;
a front cover sub-assembly (401) to accommodate the single module (207); and
a PUF blocker (108) to cut off heat loss from the bottom of the tank assembly (101), covered by bottom service cover (109).
The induction coil water heater (100) as claimed in claim 1, wherein the single module (207) comprises:
a coil assembly (103) comprising:
an induction coil 502 used to heat the water in the tank assembly (101); and
a frame 501 having concave curvature similar to the curvature of the tank assembly (101), wherein the frame 501 has protrusions provided on the front side, in conformity with the shape of the induction coil 502, to accommodate the induction coil 502; and
a sub-unit (205) to cover the tank assembly (101) and the coil assembly (103), comprising:

a ferrite holder (104) having a concave curvature similar to the tank assembly (101) and the induction coil assembly (103), wherein a plurality of supporting frames (202) is provided on the front side of the ferrite holder (104) and a plurality of bosses is provided on the respective right and left sides of the ferrite holder; and
a mounting frame (105) having a protrusion on its front side to accommodate a fan (112) for cooling and provision is provided to accommodate main PCB (113), wherein a plurality of bosses is provided on the respective right and left sides of the mounting frame (105);
wherein sub-unit assembly (205) is formed by fastening the plurality of bosses (206a) provided on the ferrite holder (104) and the mounting frame (105) in a way that both the ends of the ferrite holder (104) are affixed to the respective ends of the mounting frame (105) and middle of the ferrite holder (104) is linked with a structure (208) provided in the middle of the mounting frame (105) which divides the sub-unit into two halves (301a, 301b).
The induction coil water heater (100) as claimed in claim 2, wherein the
single module (207) is formed by fastening the plurality of bosses provided
on the frame 501 of the coil assembly (103) and the sub-unit assembly (205)
using screws and/or nut and bolt combination.
The induction coil water heater (100) as claimed in claim 2, wherein the
plurality of support frames (202) provided on the front side of the ferrite
holder (104) accommodates a plurality of ferrites which cutoff heat flow
towards injected PUF.
The induction coil water heater (100) as claimed in claim 2, wherein a
plurality of holes (201) is provided on front side of the mounting frame (105)

to inject polyurethane foam (PUF) into each half (301a, 301b) of the sub-unit
assembly (205).
The induction coil water heater (100) as claimed in claim 2, wherein ribs
(302) are provided on the inner surface of the mounting frame (105) to
provide stiffness in order to avoid bulge in the assembly due to pressure
exerted by the injected PUF.
The induction coil water heater (100) as claimed in claim 2, wherein the
ferrite holder (104) has continuous extended frame (203) around its perimeter
to stop leakage of PUF liquid outside the single module (207).
The induction coil water heater (100) as claimed in claim 2, wherein a
plurality of stoppers (303) is provided on top and bottom end of the frame
501 of the coil assembly (103) to maintain a gap between the tank (101) and
the induction coil.
The induction coil water heater (100) as claimed in claim 1, wherein the front
cover sub-assembly (401) comprises:
a front PUF blocker (107) to cutoff heat loss from front side of the tank 101; and
a front cover (106) having a slot in the middle to accommodate the front PUF blocker (107).
The induction water heater (100) as claimed in claim 9, wherein the front
PUF blocker (107) is in the shape of a hollow rectangle with its top side and
bottom side having curvature similar to the tank 101 and width of the front
PUF blocker (107) is identical to the width of the tank 101.
The induction water heater (100) as claimed in claim 9, wherein provisions
are provided on the front cover (106) to fasten the front PUF blocker (107)
and the single module (207).
The induction water heater (100) as claimed in claim 1, wherein the single
module (207) is easily removable by unfastening the plurality of screws, for
maintenance purpose, without damaging the PUF surrounding the single
module.