Immersion heater thermostat unresponsive

Measure at the taps or in the cylinder somehow?

Measure where it is stored, at the top of the cylinder, which is where the Legionella will form. Tuck a thermometer under the insulation, tight against the metal of the tank. Record it at the time the 'stat clicks off.
 
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Even electrically heated water costs depend on your water useage. A three minute shower is only about 90p. A bath about £4. But daily heat loss about £1 from the cylinder even if all HW pipes are lagged.

27.203p Kwh 9Kw electric shower run for 3 minutes = 12.241p

Assume a full cylinder of hot water is needed for a bath - cylinder takes 90 minutes to heat up, with 3kw element = 122.41p or £1.22

Cost is around 1/4 to 1/3, if gas heated.
 

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