ChatterBank4 mins ago
Immersion heater isn't working
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How competent are you with electricity? Do you have any test equipment? If you are competent, you could try shorting the thermostat and seeing if the heating element works. If it doesn't, you can be pretty sure the element's gone.
If you're unsure of your competence, leave it alone and call in a qualified electrician. It's not worth risking your life for a few quid.