Engine Coolant Heater Radiator

A predominantly metal item which can consist of two interlocking cylindrical cases. The inner cylinder accommodates the combustion, chamber heater, coolant, engine and can be equipped with ribs to enhance thermal conductivity. The heat radiating from the combustion chamber is transmitted via the wall and the ribs to the coolant flowing in the space between the inner and outer cylinder. Connectors for hoses, tubes and attachments can be included. Excludes: radiator, vehicular compartment heater.