Abstract: Apparatus utilizing waste heat from a furnace or the like to heat water for any desired purpose or to supplement a conventional heating system. In its illustrative embodiment, the invention provides a heat recovery device adapted to be interposed as a unit in a flue duct to absorb heat from the hot gases and products of combustion escaping through the flue duct, connections being provided for a positive, controlled flow of a heat absorbing liquid through the device. The device includes an inner flue section, a liquid flow coil around the flue section and an outer sleeve relatively insulated from heated components and joining the parts into a device capable of being stored, handled and installed as a unit.

Abstract: Method, system and apparatus particularly advantageous for reducing the level of irritants and life threatening contaminants which exist in air within houses and other buildings the interior of which presents a relatively sealed environment. The embodiment illustrated exhibits ductwork defining a controlled flow path having an inlet or inlets arranged to communicate the interior of the living and/or working quarters of such a building with said path as well as outlet(s) therefrom to said quarters. Disposed in connection with said path are a blower for inducing a controlled flow of contaminated air from said living and/or working quarters to and through said path and series related temperature conditioning devices.

Abstract: A solar panel comprising a generally cylindrically shaped sealed housing which is hollow and defines therein a relatively shallow generally cylindrical chamber one end of which is bounded by an impervious base and the opposite end of which is bounded by a disc of baked solar glass, an intermediate portion of a length of seamless heat conductive tubing coiled within said chamber in a substantially concentric spaced relation to the peripherally bounding wall thereof, said coil being formed to provide therein successive loops thereof which are substantially concentrically arranged and radially spaced to produce within said chamber a substantially extended flow path for passage therethrough of fluids, the respective positions of said loops and said disc of solar glass providing that they are disposed in a plurality of planes which are essentially parallel, the respective end portions of said length of tubing being disposed exterior to said housing for the coupling of said tubing into a related system to which the