If you can obtain a multimeter from someone, check the actual resistance of
your immersion heater element. Make sure that you disconnect all wires from
the heater and thermostat. The resistance of the heater should be about 20
Ohms assuming it is a standard 3kWatt heater. With this same multimeter you
can also check that there is no electrical leakage between the heater and
the copper tank itself. The copper tank should be connected to Earth.


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