In an earlier contribution to this discussion,
wrote:

Yes, it seems to be OK....reasons for such confidence a

- No real heat flow along the pipe that feeds the rads, just a small
bit of conduction

- Like you say all the rads would proabbly heat up

- And the man from BG tested it - with me watching!


It's gotta be right then, if BG tested it! g

If the valve *is* ok, it suggests that there's some sort of reverse - or one
pipe - circulation going on.

Looks like a floor-boards-up job, to identify exactly where all the pipes go
and thus to find where it's been plumbed wrongly.
--
Cheers,
Roger
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