Empire 18,000 BTU Vent-Free Infrared Heater SR18W-NG. Save money and peace of mind with safe and easy-to-use, vent-free infrared space heaters from Empire. Utilizing Natural Gas as fuel, this wall-mounted heater will survive any power outage to keep your loved ones comfortable. Bask in the infrared output, which radiates heat to directly warm the objects around it. All heat is kept inside your home allowing you to operate for just pennies a day, saving you money in heating costs during the cold winter months. Put your heating on autopilot with convenient hydraulic thermostat controls. Built-in safety features exceed every standard and include oxygen depletion sensor and auto shut-off to protect against any interruptions in the fuel supply. Installation is easy with no venting required. Just connect the heater to a gas source and use the included hardware to mount to a wall. Features:Model #: SR18W-NGBTUs: 18,000Fuel Type: Natural Gas Color: WhitePiezo push button ignitionTemperature Control Knob on Top of HeaterOptional Blower Sold Separately Specifications:Dimensions: 18.00" (W) x 7.00" (D) x 22.00" (H) Minimum Clearances: 36" from top. 5" from each side2" from floor when wall-mounted2" from floor when floor-mounted