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Thanks. Makes good sense. I do have an immersion heater. Meanwhile, any wrinkles for intoducing a force to nudge the hotwater circuit?

I would be grateful for some advice about my indirect CH/HW system in a 30y-old house. About 15y ago I had a new boiler fitted, in a different place from the original, so the supply to the inner cylinder of the water tank goes up from the boiler, then has to diagonally cross the floor in the...