nickso said:
they are genuine grundfos from what ive been told. they have grundfos marked on them.
the only grey ones i have seen are the ones you get in combis.
And I've seen black painted ones in Gledhill units - Gledhill told me that the 15-50 I was replacing was identical to the one I would buy from a local merchant, and that it wasn't a special Gledhill part.
I'm struggling to believe that a company of Grundfos' standing would make inferior pumps and then paint them a different colour. That would be a bit like me fitting
Wickes products on a job and then printing the invoice on paper the colour of dogs' muck.