Rheem SP10552ML Water Heater Element, Small Element - 240V/4500W Copper resistored mwd - 1 in screw-in Watt density classification: mwd, input Voltage (V): 208, input Voltage (V): 240, wattage at 208V (w): 3380, watt density at 208V (w/sq. In.): 84 Element diameter (in.): .260, element length - flange to tip (in.): 13.81, mounting Type: threaded, ACTUAL thread size - outside diameter.): 1-9/32