To remove the heating element from the hot water cylinder you will need an immersion heater spanner. This can be from the fused spur that the immersion heater is wired to, or at the main consumer unit (fuse board) where all the circuit breakers or fuses are. I have been a full-time plumber for over a decade and I get called out to boiler replacements and repair jobs like this regularly.

First, you’ll need to drain the water out of the hot water cylinder. Orange hose connected to drain off In this post, I’ll go through my processes for replacing immersion heaters thermostats and heating elements. Immersion heater with cable When fully drained, you should be able to shake and slightly move the cylinder. You will be able totell when it’s empty. 2. Remove the Heating Element You should only isolate the electric circuit (or fuse) that the immersion heater thermostat is powered by as turning all the power off means the freezer will be off also. 2. Remove the Old ThermostatAfter confirming the thermostat is faulty (with a multimeter) and you have bought a replacement thermostat, it’s time to replace it. It could be a fuse or power supply problem causing you to get no hot water from the immersion heater. Immersion Heater Thermostat Replacement Replacing an immersion heater thermostat is a simple job if you understand basic electrics, just be sure to isolate the electric supply properly. An immersion heater element replacement is a whole different ball game. If you are not very competent in plumbing, you should probably hire a plumber to do it.

An immersion heater heats the water in a cylinder (hot water tank), typically on a timer, so you always have hot water when you need itThen, you will need to remove the 3 wires using a small flathead screwdriver and pull out the thermostat from the immersion heater. Both parts can become faulty and need replacing, but you must confirm you are getting 240v of electricity at the immersion heater before replacing either.