Abstract: A subterranean furnace construction includes a firebox, with the firebox formed with a surrounding outer wall defining a serpentine steam pipe wound therethrough for use in heating of an associated dwelling. Positioned adjacent the firebox construction is a housing inner and outer wall including an inlet and outlet pipe directed thereto for the selective directing of a heat absorbing fluid or air therewithin to provide for enhanced linear production of heat from the firebox. Associated inlet air as well as ash removal tubing is directed into the firebox construction. A fuel conveyor is optionally provided for use of the organization.