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 blue flame heating technology, heat is distributed similar to your central home heating system. This Blue Flame Wall Heater burns 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. two-stage adjustable regulator available from local gas company. DEPENDABLE - Ideal for daily supplemental or emergency use, such as power outages ECONOMICAL - Cut heating bills by warming only occupied areas COMFORT – Manually adjust the heat setting to your desired temperature SAFE - Built-in oxygen depletion sensor (ODS) immediately shuts down the heater if carbon monoxide or lack of oxygen is detected 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 base legs (WBL100) provide the alternative of floor mounting. Separately sold optional Wall Heater Fan (WHF100) distributes heat in a quiet, yet powerful way.