Streamlined for economy and designed without sacrificing performance, the Detroit Radiant DET3 Series Low-Intensity Tube Heater is a quality, energy-efficient heater at a more economical price. Our patented two-stage technology, incorporated into the DET3 series, provides more comfort while saving valuable energy dollars. Utilizing a direct spark ignition system and hot-rolled steel emitter tubes, this series is the best in its equipment class.