Radiant Heaters provide clean heat with no smoke or odor while burning diesel fuel.This infrared barn heater allows you to heat an area and the objects surrounding the heater without being affected by wind or cold air. Radiant heat transfer occurs when the infrared light leaves the surface of the heater and travels to other cooler objects. Due to the disc on the radiant heater you achieve almost 100% efficiency of the fuel you put into your burner system. The SFA150 provides a high/low setting for 130,000 or 150,000 btu.