Hi,

Quick question for the Panel.

CH & HW work perfectly from a heating perspective. There are no
hotspots/cold radiators and HW heats up very quickly.

When the boiler runs HW only, pumping over occurs.

I have reduced the level in the expansion tank to a minimum.

There is no way to control the pump speed as the pump is intergrated
into the boiler and modulates depending on the demand for heat.

The Boiler is on the ground floor, the HW cylinder on the 1st floor,
the expansion tank in the loft.

The pumping over on HW is more of a 'trickle' than a gushing, could
extending the loop/overflow thingy by a couple of feet fix the
problem?

Cheers,
--
Steve