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the heat bank is not driving the CH, never has. Its a DPS Pandora. The water in the heatbank never moves, its indirectly heated by a coil plumbed just as though it was a cylinder. It worked perfectly well when heated by with the old non-condensing boiler that gave very hot flow temp all the...

hi I have a DPS pandora heatbank 2005 vintage with DHW plate heat exchanger driven by pump from the heatbank water, primary coil fed from boiler, secondary coil fed from solar thermal, sealed pressurised boiler circuit (expansion built into the top of the pandora) , S-plan plus.With my previous...