The Radex Radiator Hot Water Forced Air Heater is designed to efficiently use the waste water heat produced by a water cooled engine, or a hot water system, to generate air heat. Their quality stainless steel construction minimizes maintenance and is highly resistant to corrosion. Simply connect to a circulating source of hot water and a low voltage power supply and it delivers an endless supply of temperate heat. You could also use the wasted energy from your engines coolant to provide dry, clean cabin heat. Ideal for a variety of applications including boats, RV's, trucks or cars. Note BTU based on 100 degree temp rise. Features Type Diesel Heater. Easy to install. Side mount or frame mount available. Equipped with a single or double, independently switched high efficiency 12v fans. Specifications Overall Dimensions 16.75 W x 5 D x 7 H . BTU 24000.