Grundfos pump speed?

Old 04-02-05, 10:13 PM
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Grundfos pump speed?

Can someone tell me if a Grundfos UPS 20-42F is the same as a UPS 15-42F? I know these are a 3 speed circulator but didn't know what the 20 and 15 meant?
I don't know what the RPM's are on my Grundfos UP 15-42F that I have on my boiler now, this a one speed. I want to replace my old circulator with the new UPS 20 if it'll work, I just don't know which speed to run the new one on. The new circulator has three RPM speeds, and the old one doesn't tell me the RPM's. Thanks.........
Old 04-03-05, 08:54 AM
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I searched the Grundfos web site & could find no mention of the UPS 20. If I had to guess, I would say the 20 was designed to move more water.
Old 04-03-05, 11:55 PM
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Grundfos Circulators


According to my supply catalog the "15" circulator pumps 15 gpm at 15' of head, while the "20" circulater pumps 20 gpm at 20' of head; you can try to contact Grundfos directly for the exact numbers at the website below by e-mail, or see if they have an 800 number (ask for technical assistance); you should be able to run the new one at the lower setting.

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