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.
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.
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