MLCP sizing

[HughF]

I'm planning a new CH system in our end of terrace. I'm a press-fit kinda guy and have both M and U jaws so can press both copper and MLC.

 

Can anyone see an issue with using 25mm MLC for the feed/return and T'ing off in 16 to the rads, given that I'm planning to feed this from a 8/9kW (max) ASHP? I guess I should bring the feed/return into the building in 28mm CU then drop down to MLC after the 3 port as I don't have jaws for U profile in 32mm.

 

I've got coils upon coils of both 25 and 16 in stock

[HughF]

I did consider manifold'ing this install but I'm pressed for space and don't think I could accommodate a manifold in the current airing cupboard...Shame, it would be a lot easier and cheaper as I've already got the manifold