Product Description Replacement 5.5 KW spa heater element (NPT Threaded). This element is equipped with dual dry temperature or high-limit sensors wells. Quick Specs kW: 5.5 kW (5500 Watts) Voltage: 230V Length: 1" (NPT) x 17 1/2" (Length) Material: Incoloy Hardware: Included Position: Rear End Terminals Important Information If your GFCI is frequently tripping, this is a common sign of a heating element failure. Alternatively, if your heater is struggling or not operating at all - this likely points to a failed heating element.