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.