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I think you need a Heating Engineer to assess the pipe work and rad sizes before you do anything.
I wouldn't personally 'try' changing the pump because it won't be cheap and it may not be necessary.
Different sizes of pipe deliver different flow rates per hour. It is possible that 15mm is undersized and that would give the symptoms you describe.
I wouldn't personally 'try' changing the pump because it won't be cheap and it may not be necessary.
Different sizes of pipe deliver different flow rates per hour. It is possible that 15mm is undersized and that would give the symptoms you describe.