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    Which circ replaces the old Grundfos UPS 20-42? (2 Posts)

  • David107 David107 @ 9:17 AM
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    It was supposedly replaced by the UPS 15-42, also 3 speed

    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) Steamhead (in transit) @ 10:47 AM
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    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. To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
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