In an earlier contribution to this discussion,
kmillar wrote:

If my boiler is running, and servicing the central heating, then after
some time the Hot Water is demanded, won't a flush of cold water end
up going through a very hot boiler? (From the HW Flow via common
return).

Are boilers designed to cope with this or is there a possibility of
cracking the heat exchanger?


I think there'd be even more unhappy combi owners than there are already if
they couldn't cope with that!
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Cheers,
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