Circulation Booster Heater Elements 1 500 W Watts Sheath Material Copper Watt Density 34 sq in Heater Voltage 120V AC 1 Phase Overall Length 17 in Control Range 60 Degrees to 180 Degrees F 1 1/4 in NPT Enclosure Type NEMA 1 Min Immersion Depth 11 3/4 in For Use With Mfr No CHF02155 Includes Thermostat