Infrared Vent-Free Thermostatic 12,000 BTU Natural Gas Radiant Wall Mounted Heater is the ideal choice for safe, indoor supplemental heating. This state-of-the-art vent free technology does not require a flue or chimney. This heater is great for use in your home, cabin or garage. Since these heaters do not require electricity to operate, it makes an excellent choice for everyday heating and emergency situations when the power goes out. Using infrared heating technology, objects are warmed first similar to how the sun heats and feels. This product burns with 99.9% efficiency and operates on natural gas only. Check your local regulations on installation restrictions and requirements.