On Sun, 8 Aug 2010 11:08:01 +0100, Fredxx wrote:

"PeterC" wrote in message
.. .
On Sat, 7 Aug 2010 14:36:40 +0100, Fredxx wrote:

"PeterC" wrote in message
...
I'm adding another radiator to a room; it'll be on the outside wall the
same as the present one. The gap will be only about 10cm or so, room to
get
valves in.
Instead of fitting valves to both rads., I was wondering about just
connecting them in series with a bit of pipe. Is there any major
drawback
to this method?

If the radiators are largish, I would avoid putting 2 in series. The
second
one would be cooler and less efficient. I also can't see how you could
fit
thermastic valves which would work for both rooms.

They're 1200mm and within 10cm of each other in the same room. No TRVs as
they'd argue with the 'stat.

If you were hell beint on fitting them both in series I would consider
fitting a top pipe as well. Then both rads would have similar top to
bottom
temperature gradients.

That's easy to do as a retrofit.

You ought be able to get right angle lockshield valves within 10cm.


I misread some aspects of your post. As you say 10cm is not enough room to
put 2 lots of lockshield.

I would plumb in the top pipe as a matter of course. It'll then perform as
good as a single rad of the same length.

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.
--
Peter.
The gods will stay away
whilst religions hold sway