"Grunff" wrote in message
...
IMM wrote:

To circulate the water from the heatbank through the radiators and
back requires a pump unless you use the one used for the DHW heat
exchanger and zone or diverter valves.

You don't know much about this sort of thing.

This is exactly the kind of well reasoned, cohesive argument which has
gained you a reputation for being a leading expert on the subject of
domestic plumbing, and a superb communicator.

Exactly!! I tolerate know-it-all fools. When I write about heating and
water systems take note, lots of note, you will benefit.