BIG BUDDY HEATER DBL THERM. F274805 | The most popular portable propane heater in north America. This patented radiant 4000 to 18000 Btu liquid propane heater connects directly to two 1 lb cylinders and is the perfect solution for heating enclosed spaces like cabins up to 450 sq-ft. Two swivel regulators give you the ability to adapt usage from disposable cylinders to a remote gas supply with the purchase of a single hose and filter. To light the unit, simply push and rotate the knob. The built-in Piezo sparking mechanism will take care of the rest. With the oxygen depletion sensor (ODS) and accidental tip-over safety shut-off, you can be sure that you will enjoy years of comfortable indoor safe heat.