Once you’ve got your replacement lined up and your tools ready, isolate the power supply to the immersion heater and switch off your boiler. If you’re not sure which length you need, there’s a good chance that it’s written on the cap of the heater you’re replacing. While immersion heaters use the same 2 and a quarter BSP size thread, they’re available in several different lengths. Change the immersion heater – which size? Before working on any electrical fittings, use a pair of electrical testers to verify that there is no current flowing through them. Make sure that other people in the household know what you have done so that they don’t restore the power supply while are you working. It is therefore vital that you isolate them at the consumer unit. Many electrical central heating and plumbing fittings carry live current even when they are switched off at their control panel.
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