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Thanks for the thoughts so far guys! The pump can cope fine - the reason I was suggesting the alpha was to cut the water rush noise. I think the problem is probably scaled heat exchanger and low water flow rates. I've opened up the lock shield a little on the main hall rad, it does...

Okay folks, here's the story so far. My system is an Myson Orion Fanfare 40 Si with the de facto standard three port valve, single circulating pump and domestic HW storage tank - wired as Honeywell Y-plan. Its running about 13 rads due to extensions on the house, and system was in a bit of...