The Ozark Trail Flare 360° Propane Portable Outdoor Heater, Green provides 275 sq. ft of heat all-around for your patio get-together or camping weekend. Share stories in the cooler months outdoors thanks to the heater’s 11,000 total BTUs. When used indoors, a low-oxygen shutoff sensor turns the propane gas off if there’s not enough oxygen in the room. A tip-over safety switch will also turn off the heater if it’s knocked over. This heater uses a 16 oz./1 lbs. propane tank (not included).