Abstract: The multipurpose heating apparatus comprises a hollow and closed elongated metal casing forming a combustion chamber which is fixedly mounted within a closed insulated elongated housing, with the combustion chamber casing being spaced from the top, side walls and part of the bottom wall of the housing to define an air circulating passageway. Air supply blower means is connected to one end of the air circulating passageway while the other end of the passageway is connected to an air return passage provided in the bottom wall of the housing. The combustion chamber is divided into a solid waste fuel burning zone and into a gas or liquid fuel burning zone. Fuel burned within the combustion chamber transfers heat to the metal casing which radiates the heat into the air circulating passageway.