Thanks for the speedy reply.
Surely the fact that 1 of the ports is left open shouldnt matter as the CH/HW pump ( which is in the upstairs cupboard just before the mid position valve ) won't be running if only UHF is demanded.
The UFH 2 port valve and pump are in the garage near the boiler...
Hi, some years ago I had wet UFH installed in my conservatory. It was just chopped into the existing Y plan wiring and plumbing. The problem being that when UFH demands the CH/HW runs and vice versa. We have put up with it but now as we are spending more time at home it needs fixing.
The best...