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whats a more powerful pump then a grundfos ups 25-50 130

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S

Sachis

Hi i have a grundfos pump 25-50 130 p/n 59525418
radiators downstairs are cold and upstairs hot after an 1-hr 2 hrs then the downstairs gets hot
i think the pump i have is too weak
would would be a more powerful pump to help with this ?
thanks
 
How old is the pump as it sounds like it’s failed not too small just weak
 

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