Patent ID: 6666174
Filing Date: 2003-12-23
Classification: F23M,F23N,F24H

Abstract:
An elevating base for rendering a gas-fired water heater having a lower combustion chamber, explosion proof; said base having elevating support means to support said water heater elevated from a floor surface, one or more vapour detectors associated with said base to detect the presence of combustible vapours, said vapour detectors being connected to switching means to shut-off a gas burner and pilot in said combustion chamber before said combustible vapours reach said gas burner and pilot through combustion chamber air supply passages in a lower end of said gas water heater housing, said elevating support means having securement means for securing said base to a bottom end of a gas water heater housing, said one or more vapour detectors being secured in a lower part of said base to be positioned close to a floor surface for early detection of heavier than air combustible gases, and a second optional vapour detector secured in an upper portion of said base to provide an additional safety detection at a higher level of said base below said combustion chamber.