Pipes in slab for ASHP last minute panic!

[jfb]

I am pouring my slab at 10am tomorrow morning and am thinking (last minute as usual) that it might be worth sticking in some 22mm plastic pipe under the mesh as plumbing routes are tricky as it is a barn conversion. Small, 2 bed, 70m2 internal area.

 

I will have an ASHP, manifold under stairs for UFH and some sort of UVC upstairs (possibly a pre plumbed sort) next to the bathroom.

The ASHP will be providing heat (UFH downstairs/rads upstairs) and DHW.

 

Would it be most likely that the ASHP 22mm hot and cold will go to the UVC first and then off to the manifold?

If that is the case I could run 2 x 22mm pipes from the ASHP in the slab and up to the upstairs UVC and then another 2 pipes from the UVC down to the manifold.

 

Or - should the pipes from the ASHP go to the manifold first?

 

 

Last question - if I make a separate pipe run from the incoming water supply in the kitchen up to the bathroom - should I do that in 22mm or would 15mm be enough?

 

Any feedback welcomed!

 

 

[Carrerahill]

I would run in anything likely to be useful or easier to do now.

 

Even if never used its a small cost that may save you big later.