Hello people,

Well I was selecting some hot water circulating pumps and submersible pumps, for a rather big project.

I consulted GRUNDFOS (can't get bigger than that).

For the hot water circulating pumps, Grundfos informed me that the best selection according to my (flow, head) requirements was a pump with a generally low efficiency curve:
Efficiency at working point: 31.6 %
Maximum effiency of the pump curve : 32.7%.

Is this selection considered acceptable? Any thoughts?

As for the submersible pumps, since my flow requirements is low (15.8 gpm at 6 meters head, 8.7 psi), the efficiency of the selected pump kept appearing flow on the software.
Any thoughts?

Thanks !

Paul

Correction:
As for the submersible pumps, since my flow requirements is low (15.8 gpm at 6 meters head, 8.7 psi), the efficiency of the selected pump kept appearing low on the software.
Any thoughts?