UFH manifold for radiator circuit - 15mm?

[SuperPav]

I'll have a heat pump running 2 UFH manifolds (one for house, one for workshop/gaarge), each with their own pumps.

 

I also have 5 radiators upstairs which will be run off the same heat pump. As all the pipes run radially into a utility cupboard, I was just going to fit them all to a (third) UFH manifold, as it means I can centrally adjust the flow to balance the rooms, and if necessary can later on add remote thermostats to the rooms to close the individual loops, rather than having to use radiator stats.

 

Pipe runs are in 15mm Hep2O. I've found the polypipe push fit manifolds but they seem to imply they're for 15mm overlay/UFH systems. Would the 15mm Hep2O not work with these directly? as it would save me a hassle installing it. If not, I'll just get a cheaper manifold and some sort of adapter to fit 15mm pipe to a eurocone connection (I haven't got any 16mm UFH pipe left over to use straight couplings 15-16mm)