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Having investigated this further I find that if the new pump is installed as was i.e. with flow upwards then: flow through both motorised valves is in reverse flow through indirect HW cylinder is: in bottom / out top flow through boiler is : out bottom / in top With the above 3 flows...

Whilst replacing a failed Grundfos pump with similar I noticed that if I fit the new pump in the same orientation as previously i.e. pumping upwards in a vertical pipe run, that both the 2 port Honeywell motorised valves (also in vertical pipe runs) will have flow in the opposite direction to...