This patented radiant 4000 to 18,000 Btu liquid propane heater connects directly to two 1 lb cylinders and is the ideal solution for heating 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. 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 outdoor safe heat.