"Pet @ www.gymratz.co.uk" wrote in message
k...
Mike wrote:

Persdonally I'm thinking towards just 28mm from Manifold to existing
22mm.
What is the heat output of the UF ? I've just had to change a 22mm
system
to 28mm but that was for a 40m send and another 40m back carrying 20kW.

10kW UFH load feeding all of living floor (4 zones) but this then shared
(T'd off) to Bedroom/Bathroom floor zone which is 6 rad's in total all
run in 15mm from original heating config. All routed from airing cupboard.

Looking at the Copper Development Association tables I'd say 22mm was okay
in your case provided there aren't lots of joins or bends in it, though you
had better look at them yourself to confirm all the details.