Which circ replaces the old Grundfos UPS 20-42?

D107 · May 2007

But the old 20-42 speed one had a very nice low flow curve (as I read it), perfect for my basement 28ft 3/4" Slantfin run (out of 80ft total basement zone run).

I figure that run is about 5ft of head--20-42 would give 2gpm vs 5gpm by 15-42 or superbrute 15-58. I have an old recently disconnected 20-42 from the family house that I'm thinking of installing at my place just to hold me a few years until I can replace my old boiler. Currently installed is a B&G LR20BF 'Little Rooster' which is way overpumping at 13gpm or so--sounds like an oil well just before it gushes.

Glad that when I do get a new boiler, the new Wilo micro circs will be available.

Thanks,

David

Steamhead (in transit) · May 2007

Try

a Bell & Gossett NRF-9F/LW. It's a nice small circ that will fit in standard flanges, and will pump 7 GPM at a 3 foot head which is less than the 15-42's 12 GPM at that head. We use these on little converted gravity systems in 2-story rowhouses all the time, which have very little head. They work great.

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Which circ replaces the old Grundfos UPS 20-42?

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