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[Mikesolar]

Originally Posted by Ormston

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

17mm is an odd size, I thought. I guess it depends on the manufacturer but fittings are usually standard.

For those who don't know, screed is similar to gypcrete and is a easily spreadable cement based topping (non structural)

I have had this on going argument with a lot of people about heat spreaders vs cement. To me cement is vastly superior so I expect you are right. Even IF you could get the same spacing with spreaders, there is a lot of emission area which is missed as a percentage of the total floor area. Not so with cement.