Abstract: The present invention relates to a parabolic shaped heater comprising a parabolically shaped lower wall structure enclosed by a horizontal heat collector panel, and wherein this enclosure defines a generally closed firebox for supporting fuel in the form of wood, coal and the like. Further, there is provided a hood that is suspended about an upper portion of the firebox and extends generally downwardly therearound, and is spaced outwardly therefrom such that air may be induced upwardly between the parabolic firebox and the hood, and over the heat collector panel so as to effectuate an efficient heat transferred between the firebox and the passing air. Finally, a central heat distributing system may be operatively associated with said hood for directing air therefrom to other parts of the structure housing said parabolic heater.

Abstract: A stove or furnace for combusting and extracting heat from wood and wood-type fuels includes a firebox arrangement for primary combustion and a flue structure coupled to the firebox which includes a plurality of flue gas decelerating chambers for slowing propagation of flue gas, heat exchange to the environment, and further combustion of fuel constituents in the flue gas. The chambers are coupled in series through restricting and accelerating passageways for maintaining draft between chambers, finally leading to an outlet chimney. The chambers are formed with baffles for greater turbulant mixing, combustion, and heat exchange. Furthermore, a tubular conduit may be provided extending from the firebox through the flue structure chambers. The tubular conduit is formed with orifices for injecting burning flue gas from the firebox primary combustion directly into the series coupled chambers to enhance secondary burning.

Abstract: A heat-saving attachment in the nature of a jacket surrounding the smoke pipe of a furnace located in a basement or other relatively unheated space. Air is drawn from the unheated space or other area into the annular space between the jacket and smoke pipe, absorbing heat from the exterior of the pipe as it is directed through laterally disposed baffle means within the annular space from whence it is directed through a warm air duct to a space to be heated. Electrical controls may be provided to establish predetermined time delays between turning on and off of the furnace burner and respective on and off controls of an intake fan for drawing air from the unheated space into the jacket.