Mr. Heater’s propane Buddy heaters have become North America’s most popular portable heaters. The 18,000 BTU Big Buddy is the perfect solution for heating spaces up to 450 sq ft. Its tip-over safety shut-off switch and low oxygen safety shut-off sensor will bring you peace of mind, whether at the campsite, workshop, job site, or patio. Features a single control start knob with three heat settings, and two swivel regulator that connect directly to 1 lb propane cylinders. To light, simply push and rotate the knob to pilot and the piezo igniter will take care of the rest, no matches required. With quiet, efficient, and odor free operation, you��ll enjoy years of comfortable safe heat. Radiant propane heater in an easily portable design High-medium-low heat settings: 18,000-9,000-4,000 BTUs Heats up to 450 sq ft Tip-over safety shut-off switch and low oxygen safety shut-off sensor Approximate 2.8 hour run time on high and 11 hour on low with two 1 lb cylinders Piezo igniter – no electricity or matches required