Hi I'm I've just joined and hope to gain some well needed knowledge! I'm replacing the old 1 pipe heating system in my house as its very old and full of leaks! We're putting down a solid wood floor so I don't want any joints under it that might fail! I'm thinking of using the Emmeti manifold system for wall hung radiators but can't decide what pipe to use. I could use their own Gerpex pipe but its 16mm and I don't think it'll connect to "standard" rad valves or can I use 15mm pex pipe? Their tech guy that I spoke to said it had to be 15mm with a 1.7mm wall thickness, what 15mm pipe can I use? Thanks!