60,000 BTU Single Burner Propane Furnace Kit. We are offering this furnace kit in response to requests for a larger furnace. The twelve inch diameter burner delivers an impressive 60,000 BTU output at a delivery pressure of less than 1 PSI. A solid welded frame surrounds the burner making the unit almost indestructible. This furnace comes completely assembled and it is supplied with the appropriate regulator and hose.