Ufh manifold, blending valve with ASHP.

So all my bits turned up for my ufh, but I’m confused with the manifold layout, I was told if I’m fitting an ASHP I don’t need a blending valve, is this right. Who has a blending valve and who doesn’t. Confused as usual.

By Russell griffiths, July 11, 2020
71 replies

I think I'm more confused than I was earlier. Does this therefore mean that all regular TRVs are unsafe as they won't protect the slab? How come? Are they just cheaping out on the ASHP water pumps? Is there an additional bypass valve within the TRV? If not then presumably it would be trying to send 100% of the flow through the ASHP and be blocked by the zone valve. Edit: at least some of them do which is starting to make more sense.