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Yes, sorry, you only have to equalise the levels in the tanks as the hot water comes off the top of the main tank. For some reason I kept thinking you have to drain the whole system, as you do when changing an element. You would reckon I would know better coming from two generations of...

Couple of things, yes usually you have to drain them, but a warning here you have to be sure that the power is off in case the time clock for the off peak rate is out of sync. This would lead to a blown element with no water surrounding it. The other thing you can do is run the hot tap until...