Radiator heaters clickin/on MARINE -100% Marine Grade Stainless Steel - Precision Laser Cut Vent Panel Single Radex Double Radex 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. The 12V circulation fans can be adapted for use in 24V and 32V systems.