Dura Heat LPC80 50-80,000 BTU Propane (LP) Convection Heater 360 Degree convection heater; Variable output (50,000 - 80,000 BTU's) Propane (LP) gas only; Operates up to17 hours on 40lb. Cylinder Piezo igniter; Simple operation; No electricity required.Maximum Room Size 1900 sq ft Requires proper ventilation; Collapsible design for easy portability 11 Ft. hose and regulator inlcuded; Auto safety shut-off