This portable propane heater requires no electricity and is whisper quiet. Constructed of rugged .80 mm steel with heavy-duty lockable casters. 20 Lb. (pound) bulk tank mounts inside unit for easy portability. Hose and regulator included. Features include Hi-Med-Low heat settings, Piezo ignition, tip-over safety shut-off switch, low oxygen safety shut-off system (ODS), odorless and clean burning. Primarily intended for temporary use in buildings or structures under construction, alteration, or repair. May also be used for other temporary outdoor heating needs including construction/job sites, and garage/workshop. Cylinders sold separately. 7000 Ft. high altitude restriction. Check state and local codes for permitted uses. 24 to 72 hour run time.