Abstract: An apparatus for recovering heat, and a flue gas recovery and/or recirculation and/or induced draft apparatus for boilers. The apparatus for recovering heat may be used in combination with the flue gas recovery and/or recirculation and/or induced draft apparatus for boilers. The flue gas recovery and/or recirculation and/or induced draft apparatus receives combustion gases from the apparatus for recovering heat and recirculates a portion of the combustion gases to a burner of a boiler and transmits the remaining portion of the combustion gases through a flue that communicates with the atmosphere.

Abstract: A heat recovery apparatus for boilers, or the like, comprising a heat recovery housing having a gas inlet and a gas outlet disposed within the bottom and the top, respectively. A plurality of interconnected water conduit tubes is provided. A plurality of by-pass dampers pivotally connect between the pair of end walls within the heat recovery housing such that when the by-pass dampers are in a closed position, the closed by-pass dampers define a generally flat by-pass structure angularly disposed with respect to the horizontal plane. A plurality of exit dampers is pivotally connected between the pair of end walls such that when the exit dampers are in a closed position, the closed exit dampers define a generally horizontal flat exit structure extending between the pair of end walls.