ProCom Dual Fuel Blue Flame Gas Wall Heater Vent free blue flame heater uses natural gas or liquid propane. No conversion kit required. Unit is completely vent free with no outside duct or chimney needed. Unit is 99% efficient and has an ODS oxygen depletion sensor for safety. Blue flame heaters are designed to heat the air in the room first, circulating the warmth throughout a room like a central heating system. No electricity is required perfect for use during power outages. Push button piezo ignition offers easy start up. BTU Rating 20,000 BTU, Fuel Type Natural Gas or Propane Gas, Venting Type Vent-Free, Heat Type Convection, Control Type Thermostat Control, Heating Area 700 Sq. Ft., Dimensions 18.46 In. W x 24.1 In. H x 8 In. D, Weight 20 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