Patent ID: 8327810

Claim:
A water heater comprising: an outer tank; an inner tank contained within the outer tank; a cover plate having a cold water inlet aperture, a hot water outlet aperture, a heat input aperture and a plurality of exhaust apertures, the cold water inlet aperture coupled into the inner tank, thereby providing a source of cold water to the inner tank and the hot water outlet aperture coupled to the outer tank, thereby providing an exit for heated water from the water heater; a source of heat forcing hot gasses into the heat input aperture; a heat transfer pipe, a first end of the heat transfer pipe interfaced to the heat input aperture and a distal second end of the heat transfer pipe interfaced to a plenum; a plurality of heat exchange tubes, each of the heat exchange tubes interfaced at a first end to the plenum and each of the heat exchange tubes interfaced at a distal second end to one of the plurality of exhaust apertures; and a manifold interfacing the plurality of exhaust apertures to an exhaust pipe.