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I have 170l on HW Priority and well, it's not enough (Cylinder was existing in house when we bought). 2 People at 20lpm showers. It reheats rapid (Maybe like 10 minutes), but personally if you've got the physical room i'd go with a minimum of 250l. Especially in a 4 bed house.
You don't need fancy controls. You can do it quite simply with a relay that costs £15.
You don't need fancy controls. You can do it quite simply with a relay that costs £15.