"This Flagro Dual Fuel Construction Heater runs on either propane or natural gas to provide up to a whopping 1,500,000 BTU of powerful heat. Simply turn the fuel selector valve to switch the fuel supply. Product Style Industrial heater, Dimensions L x W x H in. 48 x 22 x 24, CFM 2,000, Volts 115V, Includes Electronic direct spark ignition, Blower Included Yes, Color Black, Thermostat Included Yes, BTU Output 400,000. 100 flame safeguard system Designed to withstand commercial applications Easy to operate Minimal servicing required Environmentally friendly with minimal combustion impurities"