PeterC wrote:

Speedfit Barrier Pipe carries a 25 year guarantee, so not as good as copper
pipe.
I had to replace copper pipe when the combi was fitted as the 50-year-old
pipe near the cooker couldn't take the 5 Bar pressure. The fumes and
condensation had corroded it to pinhole drips.
All of the HW & CW piping was replaced, on the grounds that if one part was
leaking...

Well, on page 4 of that link for Hep, they say 50 year guarantee, so thats
quite some time... Longer than my guarantee anyway

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