This patented 4,000 to 18,000 Btu liquid propane heater connects directly to two 1 lb. cylinders and is the ideal solution for heating up to 450 square feet. Two pivoting regulators allow you to adapt the use of disposable bottles to a remote gas supply with the purchase of a hose and filter. The integrated piezoelectric ignition mechanism takes care of the rest. With the Oxygen Depletion Sensor (ODS) and accidental tip-over shut-off safety, you can be sure to enjoy many years of comfortable and safe outdoor warmth.