Cedar Ridge Recon Dual Fuel Blue Flame Gas Heater - 30,000 BTU, Model# MD30TBU 30,000 Maximum BTU When Using Natural Gas or Propane Gas Heats Up To 1,000 Sq. Ft. Patented DUAL FUEL TECHNOLOGY Thermostat Control  The control automatically cycles the burner on and off to maintain a desired room temperature. Heat for only pennies an hour