- 4,000, 9,000, or 18,000 BTU per hour- For use with propane gas - Heats up to 400 sq. ft. - Single control start knob - Hi-Med-Low heat settings - Swivel regulators - Automatic low oxygen shut-off system (ODS) - Accidental tip-over safety shut-off - Connects to two 1 lb. cylinders - Connects to a 20 lb. cylinder with optional hose - Fan operates on 4 D batteries or AC adapter, both sold separately