Dyna-Glo wall heaters are the ideal choice for safe, indoor supplemental heating.This state-of-the-art vent free technology does not require a flue or chimney. These heaters are great for use in your home, cabin, or 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. Using infrared heating technology, objects are warmed first similiar to how the sun heats & feels. This Infrared Wall Heaters burn with 99.9% efficiency, and operates on Propane only. 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.