I am adding radiators to my 2-pipe central heating (UK). The whole piping is copper 22mm and microbore, and I'm extending it with 15mm pex barrier pipe graded for central heating.

I know that the first bit of pipes connected to the boiler must be copper, which is the case.

However, I couldn't find whether there is a minimum distance between the boiler and plastic pipes merely passing near to it, without being directly connected to it.

Is there such a thing?

Any other comment on what I'm trying to do is welcome

  • 1
    I would have to think the exposed part of the boiler is an exterior tank and not scalding hot; it might be warm, but I would expect it to only be about the temperature of the exterior of a hot water heater. How hot is the surface? Commented May 20, 2020 at 20:08
  • The boiler has casing, so it can get just warm when running.
    – anon
    Commented May 21, 2020 at 12:23


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