Dyna-Glo wall heaters are the ideal choice for safe, indoor supplemental heating. The Dyna-Glo BFSS30LPT-4P 30,000 BTU Liquid Propane Blue Flame Vent Free Thermostatic Wall Heater is state-of-the-art vent free technology does not require a flue or chimney. These space heaters 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 (LP) Propane only. 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.Dyna-Glo BFSS30LPT-4P 30,000 BTU Liquid Propane Blue Flame Vent Free Thermostatic Wall Heater Liquid Propane Ready (Fuel conversion not permitted) Blue Flame Technology works by convecting heat to warm the air the same way as a central heating system 24,000-30,000 BTU’s/hr. adjustable heat output for up to 1,000 sq. ft. Thermostat control knob automatically maintains your ideal heat level No electricity required allows for reliable back-up heating incase of an emergency situation DEPENDABLE – Ideal for daily supplemental or emergency use, such as power outagesnbsp; ECONOMICAL – Cut heating bills by warming only occupied areas COMFORT �C Heater automatically adjusts to your desired temperature; just like your home thermostatnbsp; SAFE – Built-in oxygen depletion sensor (ODS) immediately shuts down the heater if carbon monoxide or lack of oxygen is detectednbsp; CONVENIENT �C One continuous press of the battery assisted igniter makes ignition quick effortlessnbsp; VERSATILE – Includes all necessary hardware bracket for wall mountingnbsp; UPGRADEABLE – Separately sold optional base legs (WBL100) provide the alternative of floor mounting. Separately sold optional Wall Heater Fan (WHF100) distributes heat in a quiet, yet powerful way.