"G&M" wrote in message
...

"Set Square" wrote in message
...
If your pump
is running flat out, but is still not enough, I'd be tempted to install
another one very close to the existing one but in the other pipe - so
that
one is in the flow and the other in the return. [Make sure they're the
right
way way round so as not to fight each other!]

Thanks - that's even easier to do.

One thing you'll have to watch - if it's a vented system - is that the
addition of a second pump doesn't cause it to pump over. If it does, you may
either have to change where the feed and expansion pipes are connected or
turn both pumps round so that the circulation is in the opposite direction.
If you *do* reverse the flow, make sure that any TRVs fitted to radiators
are bi-directional.

Cheers,
Set Square