Dyna-Glo wall heaters are the ideal choice for safe, indoor supplemental heating. These heaters are great for use in your garage. Since these heaters do not require electricity to operate, they make an excellent choice for everyday heating, and emergency situations when the power goes out. Blue Flame Garage Heaters burn with 99.9% efficiency, and operates on Liquid Propane or Natural Gas. Not for sale in California or Canada. Check your local regulations on installation restrictions and requirements. Propane use requires 100-lb. tank or larger with two-stage adjustable regulator available from local gas company.