Anyone have any advice on circulation pumps - after moving from non buffered with half my loops open to a completely zoned and buffered situation? My external heating circulation pump (nearest Ground Source Heat Pump) is wired to what looks like a small consumer unit on the wall. I think the GSHP controls this when on 'summer disconnect', I believe it's the only time of year that it gets switched off. I was told by the supplying company that the pump would always be on outside of the summer mont