For best results, use only Rheem replacement parts for repairing your Rheem Water Heater * Watt Density Classification: HWD, Input Voltage (V): 208, Input Voltage (V): 240, Wattage at 208V (W): 3380, Watt Density at 208V (W/sq. in.): 156 * Wattage at 240V (W): 4500, Watt Density at 240V (W/sq. in. ): 208, Cold Resistance (ohms): 12.80, Outer Sheath Material: Copper * Element Diameter (in.): .260, Element Length - Flange to Tip (in.): 13.50, Mounting Type: Threaded, Actual Thread Size - Outside Diameter(in.): 1-9/32 * Thread Type Series Designation: NPSM, Configuration: Straight, Nominal Thread Size - (in.): 1, Threads per Inch: 11-1/2