UFH - Which pipe? (Screed between Joists)

18 May 2017
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United Kingdom
Hello UFH people. I am about to install a wet underfloor heating system

25mm 8:1 screed over celotex between joists @ 400 centers. Seems to be the best fit for our project.

I need to get the pipe work in soon so that the floor can go down. And then I’ll do a bit more research on manifolds/ pumps etc later.

What pipe should I be getting to give me best compatibility for when I get the other bits? I thought I was looking for 15mm but 16mm seems to be used as frequently.

Any help with brands/types much appreciated too.

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