On Sun, 22 Aug 2010 21:43:43 +0100, fred wrote:

In article , PeterC
writes

Done it: increased the distance to ~12cm, 2 angle valves and a 'U' of
copper at the bottom.
Couldn't join the tops as the rads. have no top unions, only bleed.

Well done, balance across the pair and the difference in heat output
will be next to bugger all.

That's what I've found, Fred: fully open vlves (well, half a turn in)
between the rads and the other 2 open the right amount and lots of heat! -
but why was I doing this when the temperature in the house was 22C?!!

Added some gunk and filled the system, heated it up a couple of times to
get it all mixed in, now leave it for a week, drain down, wash through and
refill with a drop more gunk in it - that, I hope, will do it for a few
years.

Awkward job getting the additive in as only 1 rad. with top unions. Used a
right-angle of pipe on a service valve and a 60ml syringe. Made the mistake
of filling the system intending to drain down a bit and add upstairs, then
found that I couldn't seal into a bleed hole. Had to turn off all valves
except the new one and bow some water out of that to get access.

By the time it needs doing again I'll have forgotten how I did it.
--
Peter.
The gods will stay away
whilst religions hold sway