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Discuss Circulation pump bore diameter in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Can anyone tell me what impact running a circulation pump with a larger diameter bore would have?
Currently running an old grundfos 15-6 on 22mm with 1 1/2 threads but looking at a lowara ecocirc 25-6.
 
Why are you looking at installing that in place of the existing?
The original pump is failing and newer pumps are more efficient. I run Lowara ecocirc pumps on four floors for ufh which work great.
I have read that the newer UPS3 and Alphas may have reliability issues.
 
more flow through the pump
 
There would be a higher flow rate/volume of water provided so long as the pipework and emitters are capable of carrying it.
If they are not, it would be pointless. There are a few things to take into account and a few situations to avoid with pump sizing and experience helps a lot. You might be better off asking a Plumber before you buy a pump that could create problems.
 
Bear in mind, that with pumps, bigger than required, is seldom better. Typically worse.
 
As above don't oversize your new pump it can throw off the balance of your system, providing your new pump can match the LPM curve of your old pump + a little through its settings then I don't see a problem . Kop
 

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