Central heating pump Grundfos 25/55 180

[ExArmy]

can somebody tell me what the numbers mean ?
is a 25/60 180 a suitable replacement?

 

[Chalked]

Not sure what the 25 means, but the 60 is 6m head and the 180 is a dimension, 180mm from flange to flange.

 

[tamz]

25mm port 5.5m head 180mm long

 

[bigads28]

I think this is correct but somebody on here will know for sure.

25 is the bore of the pipe and the 55 is pressure in kpa. 55 is about 5.5m head and the 60 is 6m of head.

So it's a stronger pump and will be fine for the small increase.