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 natural gas only. Not for sale in California or Canada. Check your local regulations on installation restrictions and requirements. Operating heater above elevations of 4,500 feet could cause pilot outage.