On a slightly more basic note.......why rip the concrete floors up......unless you are 7ft tall or live in an old cottage you have more than enough ceiling height to put the heating on top of the concrete or wooden floor.It also goes down much quicker and can be used straight away.
The best system i have seen ....and i have seen a few.... is the one set into polystyrene under a batterned or floating wooden floor using one long plastic pipe...personally i wouldnt put the pipes into concrete as the on off nature of heating puts a huge strain on it and the complete chaos involved in locating and fixing a leak would make it a no no for me, any money you save would be spent the first time you had a problem.
If you do want solid/tiled floors in for example a kitchen use aqua board on the batterns...
I used to be a tiler btw....
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