In an earlier contribution to this discussion,
wrote:

you can use it but as Roger advised it looks terrible because it sags
with the heat if on a skirting board run. copper is the much better
option even though a bit more expensive.
I had to replace a whole line of pipes because it looked so bad and
saggy.

Although I didn't explicitly say so, I wouldn't use it anywhere where it
*shows* - but it's fine for threading through awkward places where getting a
straight run of copper in would be very difficult.

My comment about sagging was more to do with avoiding airlocks rather than
appearance. For a horizontal run under the floor, I would support it along
its full length on pieces of timber so that it *can't* sag.

--
Cheers,
Roger
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