Variable BTU’s; Adjustable Heat Control - Hi, Med, Lo regulator; Operate one or two burners at a time; Manual light ignition; Safe - Heater shuts off automatically with loss of flame; Ready To Use - Mounts directly to a 1-20 lb propane cylinder ; Maximum Heating Time / Hi - Up to 15 hours on 20 lb cylinder; Great for thawing and heating purposes, vehicle maintenance, outdoor jobs, campsites, loading docks, patios, construction sites, ice fishing, camping, hunting, tailgaiting, barns, etc.; Tank sold separately; For outdoor use only