|Indoor safe unit for barns, cabins, tents and campers. Features low oxygen and tip over shutoffs, radiant and convection flow heat and multi-position settings. Connects to 1 lb. cylinder for up to 6 hours heating time or 20 lb. cylinder up to 220 hours. CSA certified. Note: Not designed for permanent installation or for use above 7000 ft. BTU/H: 18,000 Heat. Cap. Sq. Ft.: 400.