Portable Gas Torpedo Heater Fuel Type Propane Heating Capacity Output 375 000 BtuH Heating Area 9 300 sq ft Minimum Cylinder Size 100 lb Ignition Type Direct Spark Ignition Power Source Electric Thermostat Included Unit-Mounted Overall Height 23 in Overall Width 13 in Overall Depth 35 in Automatic Safety Shut-Off Included Yes Built-In Air Pressure Gauge Included No Digital Temperature Readout Included Yes Flame-Out Sensor Included Yes LED Diagnostics Included No