Abstract: A pre-assembled hot water heating mixing valve for securement to a hot water outlet pipe of a hot water heater. The mixing valve has a hot water inlet port coupling. A cold water coupling is secured to a cold water inlet port of the valve and adapted to be secured to a domestic water supply. A domestic tempered water coupling is secured to the tempered water outlet port of the valve and adapted to be secured to a domestic hot water distribution pipe. The cold water and domestic hot water couplings are pipe couplings having an inner lining which is non-conductive to die-electric currents inside the couplings caused by different adjoining metals, whereby to substantially prevent foreign matter due to deterioration of these metals at their joints from entering the valve to cause a malfunction thereof affecting the hot water temperature and the risk of causing scalding to the skin of the users.

Abstract: A nipple for connection to an outer metal casing of a host water heater for coupling a water conduit to an inner casing of the hot water heater is described. The nipple is a hollow tube having opposed threaded end portions. A thermally insulating sleeve is provided about the hollow tube intermediate the opposed threaded end portions. The nipple is adapted for connection in a hole formed in the outer metal casing with the thermally insulating sleeve in contact with a circumferential edge of the hole to insulate the metal casing from the nipple.

Abstract: A fuel oil tank is comprised of a sealed reservoir having side walls, a top and bottom walls, and opposed end walls. A closable inlet port is provided to admit fuel oil in the reservoir. An outlet port is provided in the bottom wall and is adapted to receive a coupling to connect a feed pipe to supply fuel oil to a remote apparatus. The bottom wall has an evacuation channel formed in a lowermost part thereof to direct fuel oil from the lowermost part of the tank to the outlet port which is located in a base of the evacuation channel whereby any liquid in the fuel oil which is heavier than the fuel oil will be channeled to the outlet port and not accumulate in the lowermost part of the bottom wall of the tank where it would inhibit the formation of rust in the reservoir.

Abstract: A combustion chamber for a gas-fired hot water heater comprises a top wall which is defined by a bottom wall of an inner tank. A flue extends through the inner tank bottom wall. A circumferential skirt is disposed about the combustion chamber. The combustion chamber is supported elevated from a support surface by a bottom pan assembly of a hot water heater housing. A combustion air inlet means leads to the combustion chamber. A floor shield is supported above the bottom wall and spaced below a gas burner assembly. The circumferential skirt and/or the floor shield are coated on at least one surface thereof with refractory paint to reflect radiant heat inwardly in the combustion chamber whereby to maximize heat transferred to the inner tank and to minimize heat loss through the skirt and floor shield.

Abstract: A secondary burner is provided in a sealed combustion chamber of a gas-fired hot water heater. The hot water heater has a support base for supporting it elevated from a floor surface. The sealed combustion chamber is supported over the base under an inner casing of the hot water heater which is adapted to contain water to be heated by a primary burner in the combustion chamber. An air inlet port is provided in the bottom wall of the combustion chamber to supply combustion air to the primary burner. The secondary gas burner perforated disc is secured entirely across the air inlet port and in direct unobstructed communication with the primary burner. The secondary gas burner perforated disc has holes throughout its inner surface whereby to ignite its an inner surface thereof in the presence of flammable vapors and air entering the gas burner perforated disc from an outer surface thereof. The support base has air inlet openings to permit ambient air supply to the outer surface.

Abstract: A secondary burner is provided in a sealed combustion chamber of a gas-fired hot water heater. The hot water heater has a support base for supporting it elevated from a floor surface. The sealed combustion chamber is supported over the base under an inner casing of the hot water heater which is adapted to contain water to be heated by a primary burner in the combustion chamber. An air inlet port is provided in the bottom wall of the combustion chamber to supply combustion air to the primary burner. The secondary gas burner perforated disc is secured entirely across the air inlet port and in direct unobstructed communication with the primary burner. The secondary gas burner perforated disc has holes throughout its inner surface whereby to ignite its an inner surface thereof in the presence of flammable vapors and air entering the gas burner perforated disc from an outer surface thereof. The support base has air inlet openings to permit ambient air supply to the outer surface.

Abstract: A flammable vapour detector system is comprised of a thermocouple which is mounted in a combustion chamber of a hot water heater. A combustion air intake means supplies combustion air to the combustion chamber. A gas burner is provided in the combustion chamber. A gas supply line is secured to the gas burner. An external gas valve is provided in the supply line. A gas valve control circuit controls the ON/OFF state of the external gas valve. The gas valve control circuit is connected to the thermocouple. The thermocouple is exposed to the combustion chamber to sense the temperature therein and is set to cause the control circuit to shut off the external gas valve when the temperature in the combustion chamber reaches a set predetermined temperature value upon burning flammable vapours as they propagate in the combustion chamber through the combustion air intake means.

Abstract: A combustion chamber for a gas-fired hot water heater comprises a top wall which is defined by a bottom wall of an inner tank. A flue extends through the inner tank bottom wall. A circumferential skirt is disposed about the combustion chamber. The combustion chamber is supported elevated from a support surface by a bottom pan assembly of a hot water heater housing. A combustion air inlet means leads to the combustion chamber. A floor shield is supported above the bottom wall and spaced below a gas burner assembly. The circumferential skirt and/or the floor shield are coated on at least one surface thereof with refractory paint to reflect radiant heat inwardly in the combustion chamber whereby to maximize heat transferred to the inner tank and to minimize heat loss through the skirt and floor shield.

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 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: A fuel oil tank is comprised of a sealed reservoir having side walls, a top and bottom walls, and opposed end walls. A closable inlet port is provided to admit fuel oil in the reservoir. An outlet port is provided in the bottom wall and is adapted to receive a coupling to connect a feed pipe to supply fuel oil to a remote apparatus. The bottom wall has an evacuation channel formed in a lowermost part thereof to direct fuel oil from the lowermost part of the tank to the outlet port which is located in a base of the evacuation channel whereby any liquid in the fuel oil which is heavier than the fuel oil will be channeled to the outlet port and not accumulate in the lowermost part of the bottom wall of the tank where it would inhibit the formation of rust in the reservoir.

Abstract: A shield for a combustion chamber of a hot water heater is described. The combustion chamber is a sealed or not combustion chamber and the metal heat shield encircles and is spaced about the burner and pilot which is located in the combustion chamber. The shield is also spaced from the skirt and a bottom wall of the combustion chamber. The shield is further provided with apertures to permit passage of air supplied by an air supply duct. The shield provides for heat concentration on a lower heat transfer wall of the inner casing containing the water to be heated. The shield also reduces heat loss through the skirt and the bottom end wall of the combustion housing.

Abstract: A base for rendering a gas-fired water heater, having a lower combustion chamber, explosion-proof, is described. The base has elevating supports which are provided with securement means in an upper portion thereof for securing same to a bottom end of a gas water heater housing whereby to support the gas water heater elevated from a floor surface. One or more vapour detectors are associated with the base to detect the presence of combustible vapours. The vapour detectors are connected to a switch to shut off a gas burner and pilot in the combustion chamber before the combustible vapours reach the flame of the gas burner and/or pilot through combustion chamber air supply passages in a lower end of the gas water heater housing. The temperature in the chamber is lower than the temperature of ignition of gas vapour.

Abstract: An explosion proof gas-tired water heater is comprised of a housing having a water reservoir provided with a sealed combustion chamber thereunder. A flue pipe is disposed above the combustion chamber and extends through the reservoir. A gas burner and pilot are provided in the combustion chamber. At least one air supply channel is provided to supply fresh air to the combustion chamber. The air supply channel has an intake disposed a predetermined height above the floor to prevent combustible vapors from entering the combustion chamber. Vapor detectors and/or pressure sensors may be provided as added features to detect the presence of combustible vapors as well as the production of harmful carbon monoxide in the combustion chamber and to actuate the gas supply cut-off valve.

Abstract: A termination unit for a through-the-wall horizontal vent of a gas combustion device having a combustion chamber and a burner, is described. The termination unit comprises a wall mounting plate which is secured to a vertical wall outer surface and about an outer sleeve of a coaxial flue pipe. A fresh air chamber is secured to the wall mounting plate. An exhaust end of an exhaust flue pipe extends through the wall mounting plate and the fresh air chamber to exit through an outer wall of the chamber. Air intake ports are provided in an outer peripheral wall of the chamber to supply fresh air to a coaxial passage between the exhaust flue pipe and the outer sleeve to feed the combustion chamber. An air baffle is provided in the chamber about the exhaust end of the flue pipe and extends through the chamber. Wind deflector flanges are disposed in spaced relationship about the air intake ports of the chamber.

Abstract: An explosion proof gas-tired water heater is comprised of a housing having a water reservoir provided with a sealed combustion chamber thereunder. A flue pipe is disposed above the combustion chamber and extends through the reservoir. A gas burner and pilot are provided in the combustion chamber. At least one air supply channel is provided to supply fresh air to the combustion chamber. The air supply channel has an intake disposed a predetermined height above the floor to prevent combustible vapors from entering the combustion chamber. Vapor detectors and/or pressure sensors may be provided as added features to detect the presence of combustible vapors as well as the production of harmful carbon monoxide in the combustion chamber and to actuate the gas supply cut-off valve.

Abstract: A termination unit for a through-the-wall horizontal vent of a gas combustion device having a combustion chamber and a burner, is described. The termination unit comprises a wall mounting plate which is secured to a vertical wall outer surface and about an outer sleeve of a coaxial flue pipe. A fresh air chamber is secured to the wall mounting plate. An exhaust end of an exhaust flue pipe extends through the wall mounting plate and the fresh air chamber to exit through an outer wall of the chamber. Air intake ports are provided in an outer peripheral wall of the chamber to supply fresh air to a coaxial passage between the exhaust flue pipe and the outer sleeve to feed the combustion chamber. An air baffle is provided in the chamber about the exhaust end of the flue pipe and extends through the chamber. Wind deflector flanges are disposed in spaced relationship about the air intake ports of the chamber.

Abstract: A combination space and hot water heater is comprised of an inner tank having an outer casing spaced therebout with insulation being interposed between the casing and the inner tank. The inner tank has a glass-lined inner surface and a heater is provided within the inner tank for heating a same volume of water within the inner tank. An anode is provided within the inner tank. A closed water circulating circuit is connected to the inner tank for circulating hot water from the tank through heat exchange means connected in the closed water circulating circuit. Preferably, but not exclusively, the heat exchange devices are radiators.

Abstract: A hot water tank is comprised of a cylindrical disc-shaped support base on which is supported a cylindrical inner tank concentrically therewith. A circumferential ridge projects upwardly adjacent an outer peripheral edge of the support base and spaced from a lower edge portion of a circumferential side wall of the inner tank to form a circumferential containment channel between the ridge and the lower edge portion. The channel has a volume sufficient to receive a lower portion of a plastic film pouch wrapper disposed at least about a lower section of the inner casing as well as a pre-determined quantity of hot expandable liquid urethane placed therein in sufficient quantity to fill a space between the inner casing and an outer shell secured spaced about the inner casing when the urethane is expanded. The channel prevents the liquid urethane from flowing out of the lower portion of the wrapper located therein due to deterioration of the wrapper when exposed to the hot liquid urethane.

Abstract: A support base for a gas water heater cylindrical housing is described. The base comprises a circular bottom dish having a flat bottom wall and a circumferential flange. A circumferential rounded edge is provided between the bottom wall and the flange. Air passages are defined about the circumferential flange. A circular housing support bottom wall, of larger diameter, is secured on the circumferential flange and has a central passage formed therein to admit air to a burner chamber supported on the bottom wall and through the air passages of the base wherein air currents are developed to cool the base when the burner is in use. The base therefore provides heat loss and further permits sliding and rolling displacement of the water heater cylindrical housing on a floor surface without damaging the floor surface due to the circumferential rounded edge of the base.