Double Burner 30,000 BTU Radiant Tank Top Propane Portable HeaterThe Dyna Glo TT30000M Double Burner Tank Top Heater generates radiant heat that warms people and objects rather than the air. It is a portable heating solution that is perfect for indoor (with proper ventilation) and outdoor construction use. Rated at 9,000 15,000 BTUs, the TT30000M heats up to a 25 foot radius for a period of 14 to 48 hours depending on the number of burners lit and the BTU level selected. The TT30000M does not require electricity