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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. cylinder;Connects directly to a 20 lb.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. cylinder and is the perfect solution for heating enclosed spaces like large tents up to 225 sq.