Cedar Ridge Recon Dual Fuel Blue Flame Heater - 10,000 BTU, Model# MD10TBU 10,000 Maximum BTU When Using Natural Gas or Propane Gas Heats Up To 350 Sq. Ft. Patented DUAL FUEL TECHNOLOGY 1 Unit operates off Natural Gas or Liquid Propane Thermostat Control  The control automatically cycles the burner on and off to maintain a desired room temperature.