Re: Header Tank Overflowing with Warm Water
as you say your tanks are both on same platform but useally cause your cws holds more water the level will be higher than the f/e.
and this is not being affected so it must be an issue with a mixer etc.
my first check would be the shower mixer. check along the hot/cold pipes to the shower from the supply and look for any isolation valves and if so shut them off.
if it stops overflowing thats the problem mixer if not move on to the next tap etc.
what shower mixer have you ?
is it an old install ?
as many now will not work on mixed pressures only balanced pressure.
i take it its not a thermostic mixer valve.
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