Patent ID: 6901886

Claim:
A secondary burner for a sealed combustion chamber of a gas-fired hot water heater comprising a support base for supporting a hot water heater housing elevated from a floor surface, said sealed combustion chamber being supported over said base under an inner casing of said hot water heater adapted to contain water to be heated by a primary burner in said combustion chamber, an air inlet port in a bottom wall of said combustion chamber to supply combustion air to said primary burner, a secondary gas burner perforated disc secured entirely across said air inlet port in direct unobstructed communication with said primary burner, said secondary gas burner perforated disc having holes throughout said inner surface whereby to ignite on said inner surface thereof in the presence of flammable vapors and air entering said gas burner perforated disc from an outer surface thereof, said support base having air inlet openings to permit ambient air supply to said outer surface, said secondary gas burner perforated disc welded about or over said inlet port and disposed a predetermined distance under said primary burner and concentrically aligned therewith whereby flammable vapors entering said combustion chamber will be ignited by said primary burner, and cause a flame to burn on said inner surface of said secondary burner.