MR HEATER 30 000 BTU BLUE FLAME VENT FREE HEATERPlease note that they will come equipped with a standard U. We do our best to process as quickly as possible. Multiple burner tiles utilize radiant heat, warming your space with the power of the sun. Mr. heater propane heater 30,000 btu vent free radiant natural gas this heater is conveniently equipped with a thermostat for superior control of the temperature in your space.