Abstract: An apparatus for reclaiming heat from the discharge gas from a combustion fuel heating unit, which has: inlet and outlet sections; an expansion section whose circumference gradually increases in the direction of flow, thereby providing an increased area for heat transfer; flow splitter plates which lie within and act in conjunction with the expansion section wall to form flow compartments, which flow splitter plates and expansion section wall have a slope, with respect to the centroidal axis of the flow compartment not exceeding 0.1228, which geometry prevents a separation of the flow from the enclosing walls, thereby increasing heat transfer and maintaining the drafting function; and a reduction section which converges the flow to the outlet section.

Abstract: A system for producing hot water for a residential dwelling by recovering heat from the hot combustion gases in the flue and chimney of the dwelling's heating system. The system uses the usual hot water tank and furnace of the dwelling without any substantial modifications thereto. The hot water tank is located in an upper floor of the dwelling and is connected to the furnace which is located on a lower level by a first section of pipe which extends from adjacent the water heater to the furnace flue within the chimney. A cold water supply is connected to the first section of pipe by a second section of pipe which also extends through a portion of the chimney and the furnace flue to recover heat from the hot combustion gases passing therethrough. The heated water in the sections of pipe flows into the hot water tank through the usual cold water inlet line for subsequent discharge from the tank throughout the house.

Abstract: A stove bench comprised of a metal liner forming an interior duct which is covered with tiles or masonry to form the outer face of the stove bench, an inlet to the duct for receiving hot exhaust gases from a stove or furnace, and an outlet from the duct for the exhaust of the gases to a chimney or the like. The bench has a top that is also covered with tiles, masonry, or soapstone, permitting heat conduction thereto, and permitting the top to serve as a seating or sleeping surface. The stove bench is preferably supported on two legs and has a clean-out door, preferably disposed at one end of the stove bench. A damper is disposed at the outlet from the structure for controlling the gases passed through the stove bench.In an alternate embodiment of the stove bench there is further included an insulated bypass duct disposed beneath the first, heat-conducting duct.

Abstract: A heat jacket and flue assembly includes an air inlet in the attic for communication with humid outside air and an outlet adjacent the furnace in communication with the area to be heated. A fan moves air from the outside through the attic into the heat jacket and flue assembly where it is heated by the smoke being exhausted through the flue pipe and then it is distributed to the area to be heated directly or through the furnace.