In an earlier contribution to this discussion,
The Medway Handyman wrote:


Sorry. If you just need to take the rad off for decorating for
example, then just isolate the rad, no need to turn off the supply. If you
need to replace the rad with a larger/smaller one, then you
would need to switch off the water supply, as you would be cutting
the pipes.

I answered 'no' to that one - taking it to refer to the cold supply for the
DHW. With a combi, that surely doesn't mix with the heating circuit, but is
separated by a heat exchanger?
--
Cheers,
Roger
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