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Hi thanks for reply. i have 10 rads in total over 2 floors, boiler is on ground floor. Have single pipe system and last few rads / peturn pipe are cold.

Is it possible? / How easy is it? to fit a different / more powerful pump to my Potterton 80 Combi boiler. On closer inspection I've noticed that the pump flanges only measure about 35mm across, whereby all the pumps I've seen for sale seem to measure about 45mm across the flanges. The pump...