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OOps - should have said that part first. It's a Biasi 28S combi

Thanks, I'll give that a try first. :D

I have been experiencing poor DHW temperature recently, and have been told that I need a new DHW heat exchanger as it is scaled up. But the scale (apparently) is on the DHW side of the exchanger and not the CH side ( I do live in a hard water area). The CH appears to be working fine...