Anyone any experience of the wavin underfloor heating system? Iv been informed by the homeowner that the plumber says I need 5 cores at each of the stats and that they are low voltage and programmable, now of course I can't get a hold of said plumber as he went on holidays, and I'm not sure if it's a cat 5 or belden cable required or would I run a 1.0 mm twin and earth and a 3 core & earth? Anyone familiar with the wavin ufh system?