POWERFUL: Adjust heat settings 25,000 BTUs – 48,000 BTUs heat output warms up to 250 sq ft, 9 ft radius. SAFETY: Overheat protection and automatic shut-off in case of accidental tip-overs HIGH/LOW SETTING: High setting provides up to 4 hours of heat, low setting provides up to 7 hours of heat FREESTANDING: 7 ft tall freestanding heater, featuring a domed top to help direct heat QUICK-START: Propane powered has a quick-start piezoelectric ignition