Screw Plug Immersion Heater 475 W Watts Sheath Material Steel Screw Plug Material Steel Watt Density 21 sq in Heater Voltage 120V AC 1 Phase Overall Length 17 5/8 in Control Range 60 Degrees to 250 Degrees F 1 in NPT Enclosure Type NEMA 1 Min Immersion Depth 12 9/16 in Includes Thermostat