Water from my electric shower is not getting hot enough, why?

Check the temperature control and power setting is on the correct setting for the time of year. Check the temperature control (flow control valve) is regulating the flow of water through the unit, there should be a noticeable reduction in flow when turning towards the hotter settings. Using an electrical test meter the following electrical components can be checked for continuity: Heating elements. Micro-switchesThermal cut-outs. If the unit is electronic then voltage tests have to be carried out on the PCB/s (printed circuit board/s) in the unit.