Grundfos Circulators - What's the difference?

Marshy Posted By Marshy, Feb 2, 2019 at 10:06 AM

  1. Marshy

    Marshy
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    Dec 29, 2016
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    I need to replace a Grundfos UP 15-42F that is not working in one of my zones. It is blue in color but I also have a red one for a different zone. I dont understand the difference between the two. Can anyone explain a difference besides color?
    20190202_095649.jpg
    Screenshot_20190202-095755_eBay.jpg
     
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  2. maple1

    maple1
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    Do they have different electrical hookups? Looks like one has a pig tail of some kind with it - the other just bare terminals? I wouldn't think the circ itself would be any different.
     
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  3. maple1

    maple1
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    (Don't think I've seen a Grundfos with that type logo before - on the blue one. I'm curious....)
     
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  4. Marshy

    Marshy
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    Might be an older model..? I wish I could find some manuals or something on them.
     
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  5. maple1

    maple1
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    Pretty sure they also take their circ bodies and adapt or mod them for specific applications. My LK810 has a 15-58 in it but I dont think I could unbolt it and put an off the shelf 15-58 in. Although I haven't fully investigated that. ;hm
     
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  6. Bad LP

    Bad LP
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    Agree on the logo but it may have come off a blue boiler like a Boderus.
     
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  7. Marshy

    Marshy
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    Well, here is the blue in I have.
    20190202_150406.jpg

    Here is the red one I have.
    20190202_150607.jpg

    The one not working is the blue one. Best I can tell either one will work, both are UP15-42F... I'd rather not have to buy an entirely new pump if I didnt have to but I dont know that i can get just a new motor and impeller.
     
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  8. Former Farmer

    Former Farmer
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  9. Marshy

    Marshy
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    Yeah, that's what I was starting to conclude. A whole new pump appears to be the same cost as the kit.
     
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  10. E Yoder

    E Yoder
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    I've seen black (instead of taco green) Taco circulators that came with the boiler when new. No difference other than paint from what I could see.
     
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  11. Highbeam

    Highbeam
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    The red one has the 230 max temp stamp and the blue one doesn't. Maybe the blue is for cold water?
     
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  12. salecker

    salecker
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    The first blue one has the same max temp
     
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  13. Highbeam

    Highbeam
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    Woops, it was written differently and I missed it. Sorry.
     
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  14. Marshy

    Marshy
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    Dec 29, 2016
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    I wonder if red is indoor use only but blue is indoor/outdoor..?

    Idk, if I get a chance I'll ask supply house.
     
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