Product Type Indirect-Fired Portable Oil Kerosene Torpedo Heaters Portability Wheeled Mounted Heating Capacity Output 91 900 BtuH Heating Area 4 600 sq ft Tank Capacity 17.2 gal Hours on One Filling 22 hr Ignition Type Direct Spark Ignition Power Source Electric On/Off Switch Included Yes Fuel Gauge Included Yes Power Failure Indicator Included Yes Digital Temperature Readout Included No LED Diagnostics Included Yes Built-In Air Pressure Gauge Included No