"Tim Watts" wrote in message
...
Alan Braggins wrote:


Hmm. In the middle of the night when the mains pressure might reach
10 bar in some areas you won't be running hot water through it, and
you won't run your hot taps or shower at 85C. But I think you would
want to be cautious about how close you ran it to a combi boiler or
thermal store heat exchanger.

This is true. One set of boiler installation instructions I read said to
take the last bit (1m, IIRC) in metal pipework and not plastic.

That is to limit damage when the boiler decides to keep firing after the
stat has broken.