Dyna-Glo IBF10PMDG 10,000 BTU Liquid Propane Blue Flame Vent Free Ice House Heater Liquid Propane Ready - 20 or 40 lb. tank only (Fuel conversion not permitted) Blue Flame Technology works by convecting heat to warm the air the same way as a central heating system Up to 10,000 BTU's/hr heats up to 300 sq. ft. Includes 10 ft. propane hose & regulator LOW-MED-HI variable control knob offers the most customizable heat settings No electricity required allows for reliable back-up heating incase of an emergency situation Separately sold optional fan (WHF100) improves the amount of square footage the heat reaches in a quiet, yet powerful way 1 Year Warranty