Abstract: A heater for heating the coolant in a liquid-cooled internal combustion engine including concentrically arranged inner and outer casings defining a water chamber which communicates with the water in the engine block together with a coil in the interior of the inner casing having one end communicating with the water chamber and one end with the engine block so that fluid in the coil heated by hot gases from a propane gas burner provides circulation of heated water through the water chamber and engine block maintaining the block in a heated condition for easy starting.

Abstract: A heater for the liquid coolant in an internal combustion engine which includes a tank connected to the engine block for the circulation of engine coolant, the tank having an enclosure within its interior in sealed, heat transfer relationship with the liquid coolant in the tank and outside air is introduced into the enclosure and heated by a burner for subsequent discharge from the enclosure in a heated condition. After the transfer of heat to the liquid coolant, the heated air discharged from the enclosure is conducted to the intake manifold for heating the manifold system prior to engine starting.