Product detailsThreaded immersion heater for sealed unvented heating and DHW heating systems. Infinitely variable temperature selection from around 10 °C to 80 °C. Temperature limit can be set to 45/60/80 °C. Integral temperature controller with high limit safety cut-out. Heating element and protective pipe material: copper; threaded connection: brass, thread G 1 1/2 with PTFE gasket.