Abstract: Apparatus and method for high efficiency transfer of heat from a combustion process to a working fluid wherein the combustion flame directly impinges upon a special material in contact with conduit means for directing the flow of the working fluid. The hottest part of the flame may be adjusted to directly contact such material. The apparatus in which such process takes place is subjected to a pressure gradient, directed from the top to the bottom of said apparatus such that the combustion gases are downwardly directed through the device for secondary heating of said working fluid prior to exhaust therefrom.

Abstract: An apparatus for reclaiming heat from and for controlling the flow of combustion gases passing through a flue from a heater to an exhaust stack. The apparatus includes an inner housing having first inlet and outlet openings. The first inlet opening is adapted for connection by one section of the flue to the heater, whereby combustion gases from the heater will enter the inner housing through the first inlet opening and will exit therefrom through the first outlet opening. An outer housing at least partially surrounds the inner housing, the said inner and outer housings being spaced one from the other to define an intermediate chamber which is in communication with the inner housing's first outlet opening. The outer housing is provided with a second outlet opening which is aligned with the first outlet opening and in communication with an integral damper housing which is in turn adapted for connection by another flue section to the exhaust stack.