wrote in message
oups.com...
Dont want to appear thick but "The radiators need to be connected in
parallel -
not in series - of course." What does that mean?.

Thanks Set Square and also GymRatz for the reply.


In a conventional modern two pipe system, you have a 'flow' (from the
boiler) and a 'return' (back to the boiler) pipe and all your
radiators connect from one to the other and thus are in parallel.

Years ago it was not uncommomon to have a 'one pipe' system, where a
single pipe ran arround the area to be heated from the output to the
input of the boiler, and each radiator was in parallel with a short
section of this pipe (usually the length of the radiator) - this is
the system often found in schools and municiple buildings - the pipe
often being 2" black iron. Here effectively the radiators are in
series with each other.

AWEM