I'm intrigued as to how the central heating being on affected the water level in the CWS Moreover, what did the make of the timer have to do with it all?I suspected as much. It's probably a matter of adjusting the maximum level in the cold tank so it stops filling an inch or so lower than currently.
TBH, that was my original thought, but I was doubting it since surely the water in the cylinder is hot anyway
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