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