In article ,
Simon Langford wrote:
The problem is that the 2nd floor rads are still not hot (just warm),
and the ground and 1st floor rads now have cool return pipes. If I
open up the LSVs so get hot return pipes on the ground floor, then the
2nd floor rads are even less hot.

Do you think I need a bigger boiler (it's already a pretty big one)?
Or would a faster pump help?

The size of the boiler makes no difference to the water circulation. If
you aren't getting even temperatures across all the rads, then this is the
problem.

--
*Don't squat with your spurs on *

Dave Plowman London SW
To e-mail, change noise into sound.