Multi-fueled boiler

A multi-fuel boiler having improved combustion efficiency comprising two compartments, said compartments each including external walls and an internal wall partially separating the compartments from each other to permit passage of heated gas from one compartment to the other so that the fuels may be burned in each compartment in sequence or simultaneously,

• wherein said compartments comprise a front compartment for combustion of a solid fuel positioned and connected to and communicating with said front compartment, a rear compartment for combustion of a fluid fuel, and an ash pit positioned in front of said rear compartment and beneath said front compartment and separated from said front compartment by a grate to hold solid fuel;
• means in one compartment to burn fluid fuel and means in the other compartment to burn solid fuel, a water-filled supply tank positioned above said front compartment;
• wherein said internal wall between the two compartments is a substantially vertical water-conductive wall connected to said water supply tank to heat the water of said tank;
• a plurality of fire tubes each having inlet and exhaust orifices, said fire tubes passing through said water supply tank, said fire tubes having their inlet orifices connected to said front compartment to receive hot combustion gases from both said compartments, said fire tubes heating the water within the supply tank and being connected to a flue for exhausting combusted gases.