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Thanks, one thing I should have said is that the boiler is in a detached garage, some distance from the house. I am trying to use the existing wiring so not sure how to provide the power to the boiler if I have to keep HW and CH feeds separate. As I mentioned, the old controller would power both...

I was about to change my Drayton LP722 to a Wiser model but just discovered the Wiser does not cater for gravity systems. Although the water heating is theoretically gravity, because of the distance and height difference between boiler and hot water tank it needs to be pumped to circulate...