Patent ID: 7311064
Filing Date: 2007-12-25
Classification: F22B,F24H,F28F

Abstract:
1. Apparatus for improving the efficiency of a water heater having a tank, a burner, and a flue being disposed within said tank for evacuation of burned combustion gases therethrough with resulting heating of water in said tank, said apparatus comprising: a base; and a damper assembly, extending from the base and limiting flow of ambient air from the flue, the damper assembly including: a plurality of movable dampers, each damper leaning outwardly from one another when the dampers are in a closed position; and a frame for supporting the dampers and enabling pivoting of the dampers from the closed position preventing ambient air flow therepast to an open position allowing passage of exhaust gases therepast, said dampers being disposed generally parallel to exhaust gas flow in said open position; and an enhancing heat transfer baffle, depending from said base, the baffle having a truncated conical shape and positioned within the flue and directing combustion gases from the burner against a flue wall.