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. INNOVATIVE – Can be operated with Propane OR Natural Gas DEPENDABLE - Ideal for daily supplemental or emergency use, such as power outages ECONOMICAL - Cut heating bills by warming only occupied areas Comfort – Heater automatically adjusts to your desired temperature; just like your home thermostat SAFE - Built-in oxygen depletion sensor (ODS) immediately shuts down the heater if carbon monoxide or lack of oxygen is detected & Wrong Fuel Shut-Off CONVENIENT – One continuous press of the battery assisted igniter makes ignition quick & effortless VERSATILE - Includes all necessary hardware & bracket for wall mounting UPGRADEABLE - Separately sold optional Wall Heater Fan (WHF100) distributes heat in a quiet, yet powerful way.