Abstract: A heat extractor system for a furnace, said furnace including a burner with a chimney that is connected but is normally not in operation. Instead, the furnace is connected to a vent in parallel with the chimney through a draft-inducing arrangement including a water spray in which water is heated and circulated to a point where the heat from the water is utilized. Due to the parallel arrangement of the vent and chimney, if the vent fails to operate, it will function in a fail-safe manner, with the combusted gases from the burner leaving through the chimney.

Abstract: A system is disclosed for recovering heat from high temperature combustion gases escaping from a heater such as for examples a domestic warm air furnace, boiler or the like. The system includes a first conduit leading to a chimney and a second conduit leading to a heat recovery unit which in turn is connected to a vent. A "T" connection interconnects the first and second conduits to each other and to the heater. The heat recovery unit artificially induces a draft in the second conduit which overcomes the natural draft induced in the first conduit by virtue of its connection to the chimney. An accelerator in the T connection increases the velocity of combustion gases flowing past the first conduit into the second conduit.

Abstract: A heat extractor system for a furnace, said furnace including a burner with a chimney that is connected but is normally not in operation. Instead, the furnace is connected to a vent in parallel with the chimney through a draft-inducing arrangement including a water spray in which water is heated and circulated to a point where the heat from the water is utilized. Due to the parallel arrangement of the vent and chimney, if the vent fails to operate, it will function in a fail-safe manner, with the combusted gases from the burner leaving through the chimney.