Dual fuel technology allows the unit to be operated with propane or natural gas. Up to 33, 000 BTU’s per hour heats up to 1, 100-sq ft. Included 2-in-1 millivolt remote controller works as an on/off switch or a programmable thermostat. In addition to it’s dual burner system, a 3rd burner, the ember fiber (rock wool) burning pan, provides the same effect as a glowing bed of ashes from a real wood fire. No electricity required allows for reliable back-up heating in case of an emergency situation. 8 Hand-painted concrete logs inspired by nature. Check your local regulations on installation restrictions and requirements.