This patented radiant 4,000-9,000 BTU Liquid Propane heater connects directly to a 1 lb. cylinder. The expertly engineered size to BTU ratio is augmented with a fold down handle to give this heater maximum output while retaining a minimalistic footprint. 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.