Central heating pump flanges1"3/4

[JezG]

Hi folks. I need to replace a Grundfos CC 1-180 central heating pump that has packed in. The flanges are 180 apart and are 1"3/4 but most replacement pumps seem to be 1"1/2. The pipe work by the way is 1/1/4 not copper. Is 1"3/4 some old size or am I doing something wrong?

 

[Chalked]

It will say the model on the pump. It will be a semi commercial one.

 

[Last Plumber]

It will say the model on the pump. It will be a semi commercial one.

If you ring Grundfos sales, they will tell you the replacement and whether it requires an extension piece.