Pex pipe-boiler: aerial distance

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phloaw

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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
 
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