This easy-to-use tank-top heater directly connects to a propane cylinder to deliver heat to outdoor jobs, loading docks, camping and hunting trips, animal pens, and more. Tip-over safety shut-off valves shut off automatically with loss of flame. Operates one, two, or three burners at a time and features a High/Med/Low regulator for variable heat output settings (8,000 BTU/hr. to 45,000 BTU/hr.). Soft nose P.O.L. For use with 20- to 100-lb. cynlinder (not included). Oxygen depletion sensor. Delivers instant heat. For outdoor use only. Clearance: 30".