Space-Ray has expanded its line of unitized low-intensity gas-fired infrared tube heaters, and now offers 19 different heaters in more than 100 configurations. Available in both natural and propane gas, the new ETS/ETU Series Low-Intensity Infrared Tube Heaters now range in capacity from 40,000 to 250,000 Btu/hr and have unique features not found on many competitive units. System lengths vary from 15 to 80 feet, depending on the model selected. The ETS Series Tube Heaters are available in multiple configurations, including straight, L-shape, expanded U-shape or Z-shape, and are ideal to meet complete building heating requirements. For added versatility, 90