Pipe is 17x2 PEX, that is 17 OD and 2mm wall.
As this is a renovation project things were incomplete when we moved in last November, I manually balanced the flow through each zone and run the system with no thermostats. It was controlled using weather compensation (certain outside temp = certain flow temp).
We generally had 21-22C air temp on the ground floor and 17-18C upstairs, not quite warm enough when getting out the shower.
Attic was poorly insulated as loft conversion was planned.
I think the main issue is that PEX in screed with carpet covering emmits far more heat than PEX with aluminium spreaders through wooden floor boards and carpet covering.
Will post more details and some photos when I get home.
Steve
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