ProCom Dual Fuel Infrared Gas Wall Heater Vent free plaque heater uses natural gas or liquid propane. No conversion kit required. Thermostat valve for variable heat settings. Completely vent free with no outside duct or chimney needed. Unit is 99% efficient and has an ODS oxygen depletion sensor for safety. Plaque heaters operate just like the sun, providing direct, immediate warmth in the room. No electricity is required perfect for use during power outages. Push button piezo ignition offers easy start up. PFS certified. One year limited warranty. BTU Rating 18,000 / 20,000 BTU, Fuel Type Natural Gas or Propane Gas, Venting Type Vent-Free, Heat Type Radiant, Control Type Thermostat Control, Heating Area 700 Sq. Ft., Dimensions 18.46 In. W 24.1 In. H x 8 In. D, Weight 21.2 Lb., Warranty 1 Year, Pkg Qty 1, Package Type Box This product can expose you to lead and lead compounds which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov