On Aug 20, 2:48*pm, "fred" wrote:
.... at typical combi flow rates?

I've seen this mentioned somewhere but damned if I can find it.
Just trying to get a ball-park figure for rads feedable from each size.
TIA

Might be in he

http://www.cda.org.uk/Megab2/build/p...estic-heating-
systems.pdf

cheers,
Pete.