Master Forge wall heaters are the ideal choice for safe, indoor supplemental heating. This state-of-the-art vent free technology does not require a flue or chimney.These 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 infrared heating technology, objects are warmed first similiar to how the sun heats & feels. This Infrared Wall Heaters burn with 99.9% efficiency, and operates on Propane or Natural Gas. Not approved for sale in all states and municipalities. Check your local regulations on installation restrictions and requirements. Wall-mounted indoor heater uses dual fuel technology for your choice of either liquid propane or natural gas Heater provides up to 30,000-BTUs per hour, and warms an area up to 1,000-sq ft Thermostat control knob automatically maintains your ideal heat level 24.09-in H x 10.51-in D x 28.07-in W Innovative wrong fuel shut-off prevents issues from an incorrect fuel hook-up Propane heater does not require electricity, making it a reliable, back-up heater option Infrared radiant heating technology warms objects directly, like the sun Base legs (WBL100) allows for stable floor mounting (sold separately) Quiet fan (WHF100) increases the heat radius (sold separately) Color/Finish Family: White Assembled Depth (Inches): 10.51 Assembled Height (Inches): 24.09 Assembled Weight (lbs.): 26.35 Assembled Width (Inches): 28.07 Minimum LP Tank Size: 100 lbs. Blower Included: No Feet Included: No Fuel Type: Natural gas or liquid propane Heat Delivery: Radiant Heater Type: Plaque Heating Area Range (Sq. Ft.): 1000+ Ignition Type: Piezo Installation Type: Wall Maximum BTUs: 30000 Maximum Heating Area (Sq. Feet): 1000 Portable: No Thermostat: Yes Use Location: Indoor Venting Type: Vent-free Warranty: 1-year limited CA Residents: Prop 65 Warning(s): Yes Safety Listing: CSA safety listing UNSPSC: 40101600