In article ,
Steve Wilson wrote:
I've just drained my central heating system down and fitted a trendy
new designer radiator. It looks fantastic, but has left with me with
some practical problems - I can't bleed the air out of the upper floor
radiators and I have no hot water !

By far and away the most likely cause is an airlock. To cure this, you
could try draining down again and re-filling, but this probably won't
work. The easiest way is to drain down, then fill via the drain point
using mains pressure water. You'll need someone watching the header tank
and as soon as water starts rising in this, stop.

--
*I feel like I'm diagonally parked in a parallel universe.

Dave Plowman London SW 12
RIP Acorn