Detroit Radiant Product Company is known for exclusively manufacturing gas-fired infrared heating products. The DR Series, a full line of tube heaters include coated radiant tubes with slip fit connectors, highly polished reflector material and an advanced burner design. The company's new HL series offers the benefits of two-stage heating including an additional 12 percent fuel savings over single stage heaters and 35 percent reduction in on-off cycles, design benefits and increased comfort levels.