Pleasant Hearth's Vent Free Gas Log Sets are the ideal choice to bring style and warmth to your home. State-of-the-art vent free technology does not require a flue or chimney. This vent free gas log set functions with the option of Natural Gas or Propane. 30,000 BTUs will heat up to 1,000 Sq. Ft. With 99.9% efficiency, $0.99 of every $1.00 spent on fuel is converted into heat. Forget the hassle or mess of a real wood burning fireplace or stove. With Pleasant Hearth's Vent Free Gas Log Sets, enjoying the warmth and beauty of a fire has never been easier. Minimum clearance design with the ability to be inserted into mostly every fireplace masonry. This thermostatically controlled unit does not support a millivolt remote controller. 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.