Abstract: A water heater and a cover assembly for the water heater is provided. The water heater includes a mixing valve disposed in fluid communication with each of a hot water conduit and a cold water pipe, to regulate temperature of hot water received from the hot water conduit. The cold water pipe branches from a cold water conduit and extends along a longitudinal axis of the tank to connect with the mixing valve. The cover assembly is mounted on a tank of the water heater. The cover assembly includes a first cover to conceal the cold water pipe, and a second cover to conceal the mixing valve and the hot water conduit extending between the tank and the mixing valve. The second cover is removably coupled to the first cover via one or more coupling elements.

Abstract: A liquid heater may heat liquid using at least one of an electric heater or a hybrid heat pump. The liquid heater includes a tank to store liquid, an insulator at an outer surface of the tank, and a case surrounding the insulator. The case includes a first outer panel, a second outer panel, and a cover panel fastened between the first outer panel and the second outer panel. The cover panel is detachable from the liquid heater to access electronic devices such as a controller for the electric heater.

Abstract: The method for managing a shut down of a boiler having a duct and heat exchanging components is provided. The heat exchanging component having tubed heat exchanging surfaces within the duct and headers outside the duct. The method includes regulating the temperature of the headers during shut down to a temperature close to the one expected for the steam moving from the tubed heat exchanging surfaces into the headers at a starting up following the shut down.

Abstract: A curing oven provides a structure which is supportive such that structural members extending the axial length of the oven are not necessary. Additionally, the curing oven provides structures which extend transverse to the axial length of the oven but do not extend through the walls of the oven. Thus, conductive heat transfer is limited and reduced.

Abstract: In a low NOx boiler of the present invention, a high-temperature reductive combustion zone is provided to an upper portion of a rectangular combustion chamber, and a second-step combustion zone is provided to a middle stage of the combustion chamber. A wall provided below the second-step combustion zone is tapered to narrow the combustion chamber, with a taper angle of approximately 35° or so, relative to a vertical line. An ash discharge port is provided to a furnace bottom portion, and a gas outlet port communicated with a rear pass is provided to a lower side face of the second-step combustion zone. This rear pass is connected with a further post-treatment step, via a super-heater tube and an economizer.

Abstract: In a gasification apparatus, a gasification furnace (101) having an octagonal hollow cross-sectional shape, a heat exchanger (102) having a quadrangular hollow cross-sectional shape, and a connection portion (103) which connects an upper portion of the gasification furnace (101) to a lower portion of the heat exchanger (102) are provided, thereby simplifying structures and enhancing efficiencies can be achieved.

Abstract: A shank mount assembly for a water heater that includes an annular nipple having an opening, the nipple configured to removably attach to an opening in a water heater tank. The shank mount assembly further includes an annular shank mount having an opening, the shank mount configured to removably attach to the nipple, wherein the shank mount is further configured to attach to a gas valve assembly.

Abstract: A vaporization device has a vaporizing chamber attached to a stem. A conduit running through the stem places the chamber in fluid communication with a device attached to the abutment of the stem. A lip within the vaporization chamber prevents unvaporized materials from entering the conduit. A heat sink on the stem prevents heat from traveling down the stem from the chamber to the abutment.

Abstract: A water heater door assembly includes a base plate sized and shaped to substantially sealingly cover an access opening in a water heater combustion chamber and has at least one opening through which a fuel supply line extends at least partly between a burner in the combustion chamber and a gas control valve, and a flexible seal positioned at least partly within the opening including an engaging portion substantially sealed to an edge portion of the opening, and a through hole that is shaped to receive the fuel supply and has a size slightly smaller than the size of an outer dimension of the fuel supply line such that the flexible seal and the fuel supply line are friction fit together to form a seal.

Abstract: An apparatus is provided. The apparatus includes: a humidification component configured for holding a water volume, the humidification component comprised entirely of a non-metallic material. The non-metallic material conducts heat to the water volume, the heat being received from a heating element.

Abstract: With an installation construction method for boiler facilities, the boiler facilities comprise a boiler building configured of a steel structure, and a boiler main unit suspended within the boiler building from the upper portion of the boiler building. A portion of the boiler building is constructed, a portion of the boiler main unit is suspended from the upper portion of the partially-constructed boiler building, and while the remaining steel structure portions are being added to the partially-constructed boiler building so as to construct the boiler building, the remaining portions of the boiler main unit are added to complete the boiler main unit.

Abstract: A highly reliable vacuum heat insulating material having excellent processability, usability and heat insulating performance and a heat insulating box using the vacuum heat insulating material are provided.

Abstract: A highly reliable vacuum heat insulating material having excellent processability, usability and heat insulating performance and a heat insulating box using the vacuum heat insulating material are provided.

Abstract: A fire-resistant wall intended in particular for use in an incinerator has a tube wall, composed of tubes connected by webs, and, placed in front and at a distance from the tube wall, a fire-resistant protective cladding composed of a plurality of fire-resistant tiles which are arranged next to and above one another and which are fastened to the webs of the tube wall via in each case at least one tile holder. The tiles are provided with continuous open grooves into which the tile holders engage. In the tube wall are provided inlet openings via which air can be introduced into the gap between the tube wall and the protective cladding. Also provided are outlet openings through which air can be removed from the wall. The air supply openings are arranged in the region of the open grooves of the tiles, with the result that the supplied air flows directly into the grooves and is distributed through these grooves over the entire wall.

Abstract: Inspection and maintenance drawer for the exhaust of fumes of the flue of a bio-mass powered thermal boiler, characterised by the fact that it has a closing and grasping element situated in the front part of the thermal boiler, and of an extended element which presents a compartment at its extremity, situated at the base of the flue of the thermal boiler.

Abstract: An insulation kit for use with a water heater is provided. The kit includes an insulating cover configured to be wrapped about an exterior surface of the water heater. The insulating cover includes a substantially rectangular body with opposed edges configured to overlap or abut one another when the insulating cover is wrapped about the exterior surface of the water heater and at least one downwardly facing flap configured to provide selective access to the water heater. The kit further includes a fastener packaged with the insulating cover and configured for fixing the opposed edges together, thereby securing the insulating cover adjacent the exterior surface of the water heater.

Abstract: A hot water supply system having a hot water supply system body. An operation box is inserted into a window opened in a front panel of the hot water supply system body, and a box cover having an opening to which an operation unit in a front center region of the operation box is fitted is mounted onto a front surface of the operation box. The box cover overhangs to an outside of an outline of the operation box and has a size making it possible to cover a gap between the operation box and the window from the front. A dent sized to corresponding to a size of the box cover is formed on a portion of the front panel, which includes a spot where the window is opened, and a backside corner portion of an outer edge of the box cover enters into the dent portion.

Abstract: A hot water supply system includes: a casing 1 having an opening in a front face; a front panel 2 covering the front face of the casing; and a console box 7 attached to the casing. The front panel has a window into which the console box is to be fitted. The clearance between the window and the console box is eliminated to improve the appearance of the system, and it is provided that the front panel can be attached to the casing without problems. In order to eliminate the clearance between the window 20 and the console box 7, the window 20 has a size enough for the console box 7 to be tightly fitted therein. In order that the console box 7 fitted in the window 20 can move vertically and horizontally together with the front panel 2, a support plate 8 for the console box 7 is attached to the casing 1 with a vertical and a horizontal play.

Abstract: A water level sensor, a steam generator having the same, a heating cooker having the steam generator and a control method of the heating cooker implement embodiments of the present invention. The water level sensor stably senses the change of a water level regardless of the production of scales. The heating cooker includes a cooking chamber in which food is put; a steam container generating steam to supply the steam to the cooking chamber; a water supply supplying water into the steam container; a steam heater heating water in the steam container; a water level sensor installed in the steam container to sense a change of a water level in the steam container; and a controller controlling the water supply in accordance with the sensor output value of the water level sensor, wherein the water level sensor has one electrode rod to detect a change in electrostatic capacity in accordance with a change of a water level.

Abstract: The present invention relates generally to an insulation wrap for a water heater tank including a strip of nonflammable fibrous material having an opening therein and a fibrous material element outlining at least a portion of that opening. In addition the present invention relates to a hot water heater incorporating the insulation wrap.

Abstract: When constructing a steam generator, buckstay modules are joined with tube wall units to form buckstay and tube wall modules while the boiler steel structure is being erected, and they are temporarily placed within the boiler steel structure level by level. Then an external part of the boiler top main grid is constructed whose beams are flush with the tube walls of the buckstay and tube wall modules. Then the boiler wall is mounted by aligning and welding the individual tube wall modules from top to bottom. Simultaneously, the internal components are constructed on the boiler base and hoisted to installation height. Preassembling buckstay and tube wall modules eliminate the need for inserting buckstays or tube walls from above through the boiler top main grid. For this reason, the roof opening can be smaller than usual. The inner boiler top main grid therefore does not require its own main beams, which saves a substantial amount of steel.

Abstract: A device for introducing hot gas into a heating surface tube of a waste heat boiler having an outer tube connected to the boiler wall, in particular to the tube plate, has an inner or inlet tube that is connected to the outer tube by a rounded reversing cap to form an inlet port for the hot gas. The inner tube is surrounded by the outer tube at a distance and has an inflow section and an outflow section connected to the heating surface tube. The device further has a coolant transport tube, between the outer tube and the inner tube, that extends to the vicinity of the reversing cap. The inflow section and at least part of the outflow section of the inlet tube are conical in design, where the taper is less than 2° and the cross-section of the conical region of the inlet tube becomes smaller as it approaches the outflow section. The length of the conical region is at least four times the inner diameter of the inlet tube, and the conical region of the inlet tube is designed with at least two different tapers.

Abstract: A water heater includes a tank and a jacket surrounding the tank. Between the tank and jacket is defined an annular space in which a seal is positioned. The seal extends between the tank and the jacket and defines a bottom of the annular space. The seal includes a depending flange that retains a fiberglass batt against the water tank so that the batt does not interfere with lowering the jacket around the tank. The seal also includes a plurality of arms that center and round out the jacket as it is lowered over the tank. A liquid-based insulation is pumped into the annular space under pressure, and the seal substantially prevents any of the insulation from leaking through the bottom of the annular seal. The arms may be progressively longer and/or thicker from the top down to permit some of the insulation to bypass the upper arms and fill the spaces between the arms.

Abstract: Electrical components projecting outwardly from the storage tank portion of an electric water heater are shielded from foam insulation material being injected into an insulation space between the tank and an outer jacket portion of the water heater by a hollow, open sided foam dam structure extending through a jacket opening and circumscribing the electrical components. Force exerting projections on the dam engage the interior side surface of the jacket and forcibly hold the inner side of the dam structure in sealing engagement with the tank. The projections also hold an outer side peripheral lip of the dam in a an outwardly and resiliently deflected orientation in which it is sealingly pressed inwardly against the outer side surface of the jacket around the periphery of the opening therein to prevent injected foam from being forced outwardly through the jacket opening.

Abstract: The present invention relates to a gas fed water-heater comprising a double wall container (1) inside which a burner (2) and a tank (3) of the water to be heated are arranged. At least in the portion (5?) adjacent to the burner (2) of the interspace (5) between the two walls of said container (1) is placed a thermoinsulating system comprising an inner layer (6) of glass wool or rock wool and an outer layer (7) formed of at least a one vacuum panel, which comprises an envelope which encloses inert material powder with an average size of the particles lower than 100 nanometers.

Abstract: A device for introducing hot gas into a heating surface pipe of a waste heat boiler includes an outer pipe that is connected to the boiler wall, preferably to the bottom of the pipe. The device also includes an inner pipe or entry pipe that has an admission section that is cylindrical or conically narrows and also has a discharge section that is connected to the heating surface pipe. The inner pipe is connected to the outer pipe via a rounded reversible cap while forming an entry opening for the hot gas. The inner pipe is surrounded by the outer pipe at a distance. The device also includes a coolant guiding pipe, which is placed between the outer pipe and the inner pipe and which extends into the proximity of the reversible cap.

Abstract: A device for introducing hot gas into a heating surface pipe of a waste heat boiler includes an outer pipe that is connected to the boiler wall, preferably to the bottom of the pipe. The device also includes an inner pipe or entry pipe that has an admission section that is cylindrical or conically narrows and also has a discharge section that is connected to the heating surface pipe. The inner pipe is connected to the outer pipe via a rounded reversible cap while forming an entry opening for the hot gas. The inner pipe is surrounded by the outer pipe at a distance. The device also includes a coolant guiding pipe, which is placed between the outer pipe and the inner pipe and which extends into the proximity of the reversible cap.

Abstract: An explosion-proof hot water heater of the type having a gas-fired combustion chamber at a lower end of the inner tank is described. The combustion chamber is an unsealed chamber and has a sealed bottom wall and a fuel burner in the combustion chamber. Combustion air intake ports are provided about the combustion chamber above the sealed bottom wall. A support base supports the sealed bottom wall elevated from a support surface. Air intake openings are provided about the outer skin casing of the hot water tank and spaced a predetermined distance above the sealed bottom wall. Air passages communicate the air intake openings with the combustion air intake ports of the combustion chamber. A gas vapour sensor is secured in relation to the support base below the sealed bottom wall and is adapted to cause the burner to be shut off upon detection of explosive vapours with sufficient time delay before such vapours reach the combustion chamber.

Abstract: An exhaust heat trap and redirecting system for utilizing exhaust heat includes an electric generator including an internal combustion engine. The electric generator is electrically coupled to an electrical system of a dwelling. An exhaust conduit is fluidly coupled to the engine for venting exhaust away therefrom. A substantially airtight sheath is positioned about a water tank in a water heater. The sheath comprises a cylinder having an inner wall and an outer wall. The sheath has an upper wall attached to the outer wall. A sheath inlet has a first end fluidly coupled to the sheath and a second end fluidly coupled to the exhaust conduit. A sheath outlet has a first end fluidly coupled to the upper wall of the sheath and a second end is directed outward of the dwelling.

Abstract: A water heater is provided with a specially designed molded bottom pad/foam dam member formed from a crushable material, such as polystyrene, which is received in a metal bottom pan and has concentric circular grooves formed in its top side to receive circular bottom end edge portions of the tank and outer jacket portions of the water heater. A circumferentially spaced plurality of rigid support members are imbedded in the bottom pad/foam dam member and underlie its tank groove to prevent the tank from crushing the member one of the support members is formed from an electrically conductive material and defines an electrical grounding path between the tank and the bottom pan, and the other support members are formed from a thermally insulative material to inhibit heat loss from the tank to the bottom pan.

Abstract: A water heater having a barrier for forming an enclosure around a lower portion of heater. The barrier has an inside wall, an outside wall and a space between the inside and outside walls. There is a skirt disposed within the barrier for slidably receiving the water heater tank. The burner for the water heater is disposed within the skirt. The outside wall of the barrier has at least one aperture for air to pass into the space. The inside wall has a plurality of ventilation holes to allow heat currents to escape through the space and causes a siphoning effect, thus preventing any fumes from reaching the flame. There is an outwardly extending flange surrounding a top edge of the barrier. The flange has an inside wall connected to the inside wall of the barrier, an outside wall connected to the outside wall of the barrier, and a space between the inside and outside walls that communicates with the space in the barrier.

Abstract: A prefabricated housing for an external hot water system located adjacent a house wall or the like is disclosed which has walling members including two side walls and a front wall, a roof, insulating means for insulating the walling members and the roof, and fastening means for releasably fastening the assembled housing to the house wall or the like.

Abstract: A jacket (1) is shaped to enclose at least partially a liquid storage vessel (2; 200), the jacket comprising a skin (5) arranged as a plurality of folds (20) which are capable of opening out to permit expansion of the jacket in the event of liquid escaping from the storage vessel, securing means (9a, 9b, 10a, 10b, 13a, 13b, 14a, 14b; 35) are provided to secure the upper part (32) of the jacket in position with respect to the vessel and to maintain the upper part of the jacket in position in the event of liquid escaping from the vessel. The jacket may be fitted to existing oil tank or new oil tank installations, or may be used with cold or hot water tanks.

Abstract: A sight glass assembly for a water heater flame trap and a method of making same is disclosed. A rectangular-shaped sight glass frame casing being comprised of a thin metal plate further comprising a rounded rectangular cut-out window and two metal tabs on opposite sides of the casing acting as a retainer to hold the planar transparent material of the sight window tight to the rectangular-shaped gasket. The metal frame casing of the sight glass assembly attaches to the exterior of the flame trap compartment of the hot water heater by: (a) either inserting the tabs, further comprising metal clips, into the gasket whereby they expand, locking the metal frame casing in place; or in a second embodiment (b) riveting the tabs, now in the shape of a flange, directly to the hot water heater shell. The metal frame casing is formed by a metal stamping procedure that allows for easier and more economic manufacture of the sight glass retainer.

Abstract: An inner combustion chamber access door member for a fuel-fired water heater has main and pilot burner structures respectively supported thereon by gas supply tubes sealingly extending through and anchored to the door member, and is further provided with a wire pass-through tube and a sight glass opening. After the door member has been externally secured to a side wall portion of the water heater over an access opening therein, with the main and pilot burner structures disposed in the combustion chamber of the water heater, a lighting wand is extended through the sight glass opening to light and test the burners. Subsequently, a sight glass structure is snapped into the sight glass opening to complete the installation of the door/burner assembly. Thermocouple and igniter wires extend through the pass-through tube, and are sealed therein by a laterally split resilient cylindrical sealing plug member.

Abstract: A flexible, water impervious liner is fitted in a rigid outer shell. The shell has an open top with a peripheral flange over which a top lip of the liner is fitted. A separate top plate attaches to the flange with standard fasteners for clamping the liner to the shell. Through hull fittings are provided for heating elements at the side and inlet/outlet fittings at the top. The construction allows convenient access to virtually all components of the water heater, including the liner and the heating elements, so that they can be quickly and easily serviced or replaced. A desired amount of insulation can be provided by an appropriate cover or blanket to surround the outer shell.

Abstract: A gas supply coupling for a water heater incorporating a shield to close the opening to the combustion chamber. The coupling includes a supply tube, a connector extending through the shield and a gas supply line detachably connected to the connector. The connector is staked to the shield to prevent disassembly requiring that the entire coupling be removed from the combustion chamber prior to disassembly. The gas supply line includes a threaded fastener having a unique exterior configuration requiring a specialized tool for separation from the connector.

Abstract: An open-webbed cage support device providing support that enabling a mechanical device such as a thermal expansion tank to be suspended or mounted adjacent to the thermal water heating device without the need to improvise a “made in the field” support structure.

Abstract: The water heater includes a water tank, a burner below the tank, a casing around the outside surface of the tank and spaced therefrom so as to define a flue path within the casing and along the outside surface of the tank for combustion products. Multiple flow restrictions are located in the flue path and extending inwardly from the casing towards the outside surface of the tank and forming regions of restricted flow area so that the combustion products flowing along the flue path encounter the flow restrictions and are restricted and disturbed in flow pattern. The first flow restriction which is first encountered by the combustion products is located at a position along the height of the tank no lower than one third of the overall height of the tank up from the bottom of the tank whereby the lower portion of the tank over which combustion products are flowing are substantially completely exposed to the hottest and most turbulent combustion gases.

Abstract: A flash suppressor for surrounding a gas-fired appliance, comprising a barrier for forming an enclosure around a lower portion of the appliance. The barrier has an inside wall, an outside wall and a space between the inside and outside walls. The outside wall has at least one aperture for air to pass into the space. There is a filter disposed in the space for filtering fumes from outside the outside wall to prevent the fumes from reaching the appliance and igniting from a spark from the appliance. There is an outwardly extending flange surrounding a top edge of the barrier. The flange has an inside wall connected to the inside wall of the barrier, an outside wall connected to the outside wall of the barrier, and a space between the inside and outside walls that communicates with the space in the barrier. The flange has an open top, so that fumes travel through the filter and out the open top and are thus kept away from the flame in the appliance.

Abstract: A water heater including a water container; a combustion chamber containing a main burner and a pilot burner positioned to heat water in the water container and having a side wall; a main burner fuel supply line adapted to connect between a fuel control valve and a main burner; a pilot fuel supply line adapted to connect between the fuel control valve and a pilot burner; a heat sensor line connected to a heat sensor and adapted to connect to the fuel control valve and positioned to sense heat from the pilot burner; an igniter line connected to an igniter positioned proximate the pilot burner and connected to an igniter initiator; and a removable plate sealed to the combustion chamber through which the main burner fuel supply line, the pilot fuel supply line, the heat sensor line and the igniter line pass in a sealed condition.

Abstract: A flash suppressor for surrounding a gas-fired appliance, comprising a barrier for forming an enclosure around a lower portion of the appliance. The barrier has an inside wall, an outside wall and a space between the inside and outside walls. The outside wall has at least one aperture for air to pass into the space. The inside wall has a plurality of ventilation holes to allow heat currents to escape through the space and causes a siphoning effect, thus preventing any fumes from reaching the flame. There is a filter disposed in the space for filtering fumes from outside the outside wall to prevent the fumes from reaching the appliance and igniting from a spark from the appliance. There is an outwardly extending flange surrounding a top edge of the barrier. The flange has an inside wall connected to the inside wall of the barrier, an outside wall connected to the outside wall of the barrier, and a space between the inside and outside walls that communicates with the space in the barrier.

Abstract: A water heater including a water container; a combustion chamber containing a main burner and a pilot burner positioned to heat water in the water container and having a side wall; a main burner fuel supply line adapted to connect between a fuel control valve and a main burner; a pilot fuel supply line adapted to connect between the fuel control valve and a pilot burner; a heat sensor line connected to a heat sensor and adapted to connect to the fuel control valve and positioned to sense heat from the pilot burner; an igniter line connected to an igniter positioned proximate the pilot burner and connected to an igniter initiator; and a removable plate sealed to the combustion chamber through which the main burner fuel supply line, the pilot fuel supply line, the heat sensor line and the igniter line pass in a sealed condition.

Abstract: A water heater including a water tank, a combustion chamber beneath the tank, a gas burner in the combustion chamber, an air plenum upstream of the combustion chamber, a flame arrestor located such that air in the air plenum passes through the flame arrestor to reach the combustion chamber, and a flue extending upwardly from the combustion chamber and through the water tank.

Abstract: A water heater enclosure and kit having a box-like configuration, with a top panel, a pair of opposing side panels secured to the top panel at upper ends, front and rear braces which secure the lower ends of the side panels together, and a removable access panel. The top panel has a pair of side rails having inverted U-shaped mounting channels which receive and seat upper edges of the pair of side panels. Once seated, bendable upper-joint tabs on the side panels are bent around end flanges of the mounting channels to secure the side panels with the top panel. The front and rear braces have lower-joint tabs which extend into slots on lower corners of the side panels and are also bent to form and maintain the lower joints.

Abstract: A water heater including a tank, a cylindrical jacket surrounding the tank to provide an insulating space therebetween and a cover member mounted on top of the jacket to close off the top of the insulating space. An insulating wall is provided in the insulating space between the tank and the jacket. The insulating wall is comprised of a plastic envelope member and a wall of insulating material which has been foamed-in-place inside the envelope member. The envelope is constructed in such a way as to evenly distribute the foam material inside the envelope during the foamed-in-place operation.

Abstract: A foam distribution jacket (10) for containing an insulating expandable liquid foam mixture (44) prior to expansion into a space (17) between a hot water tank (22) and an outer casing (29) secured thereabout. The jacket (10) comprises a pair of sheets (11-12) which are superimposed to define a bottom trough section (13) having a straight bottom edge (15) and opposed end edges (16). A seal (17) is formed along the straight bottom edge and the opposed end edges to form the trough (13) and to interconnect the sheets (11-12). The pair of sheets (11-12) converge to a crest portion (19) at a top end section (14) thereof. An attachment hole (20) is provided in the crest of an inner one of the pair of sheets (11-12) and is adapted to attach the jacket (10) in a depending manner from a nipple (21) in a top wall (48) of a hot water tank (22). The method of insulating a surrounding space (27) formed between the hot water tank (22) and the outer casing (29) using the foam distribution jacket (10) is also described.

Abstract: A tank structure of a hot-water supply unit capable of permitting tap water under a high pressure to be supplied thereto without using any safety mechanism. An inner barrel of a tank body is formed by rounding or bending a flat plate of an increased thickness by rolling and then joining both lateral ends of the plate to each other by welding. The inner barrel and an outer barrel are joined together through a joint ring of a thickness between a thickness of the inner barrel and that of the outer barrel. Thus, the tank body can be readily manufactured using any specific equipment.

Abstract: A water heater is provided with a specially designed molded bottom pad/foam dam member which is placed in its bottom pan prior to placing bottom annular portions of the water heater tank and its outwardly spaced jacket structure into the bottom pan. The pad/dam member functions to automatically center the tank relative to its jacket structure, and to prevent leakage past the bottom pan of liquid foam insulation injected into the tank/jacket annulus after bottom end portions of the tank and jacket are secured within the bottom pan. The top side of the pad/dam member has three concentric annular grooves formed therein. The outermost first groove receives an annular bottom end portion of the jacket, while a second groove receives an annular bottom end portion of the tank. The provision of the third groove permits the same pad/dam member to be alternatively used with a water heater having a different tank diameter to thereby improve the manufacturing efficiency of a line of differently sized water heaters.

Abstract: A removable dam provides a way to prevent liquid insulation from interfering with electrical components and from squirting out an opening in the jacket of a hot water heater.