Patent ID: 6807925
Filing Date: 2004-10-26
Classification: F23M,F24H

Abstract:
An explosion-proof hot water heater comprising an inner casing having conduit means to admit water in a water chamber thereof and to remove it therefrom, an outer skin casing spaced from said inner casing with thermal insulation between said casings, said inner casing being supported over a gas-fired combustion chamber at a lower end thereof, said combustion chamber having a sealed bottom wall and a circumferential side wall, a fuel burner in said combustion chamber, combustion air intake ports in said circumferential side wall above said sealed bottom wall, a support base for supporting said sealed bottom wall elevated from a support surface, air intake openings about said outer skin casing spaced a predetermined distance above said sealed bottom wall, air passage means communicating said air intake openings with said combustion air intake ports of said combustion chamber, and a gas vapour sensor secured in relation to said support base below said sealed bottom wall and adapted to cause said burner to be shut off upon detection of explosive vapours, said support base having a circumferential side wall, said gas vapour sensor being secured inside said support base and having a gas sensing element secured to said circumferential side wall to detect the presence of explosive vapours adjacent said support surface.