The HS45GSP Tube Heater is a source for efficient and effective low-intensity infrared radiant heat. At 45,000 BTU, it provides uniform heat distribution while operating quietly. The compact 3in aluminized steel U-tube design along with the polished deep-dish reflector is perfect for all garges, shops and patios. The burner and tube set come in one box. Optional accessories include a horizontal vent kit, a vertical vent kit, a 24v thermostat, a decorative grid kit, and an install kit.