UP15-42F Circulator Pump, 1/25 HP, 115V


Brand: Grundfos

Mfr Part#: 59896155

Model: UP15-42F

UPC#: 632514000551

Availability: In Stock
Usually ships: Today, if ordered by 3pm
Qty Price
$85.95 / each
x4 $338.00 & Free Shipping
(4 x $84.50 / each)
  • Description
  • Literature
  • Reviews (12)
  • FAQs (4)

Grundfos UP15-42F Circulator Pump (59896155) is a 1/25HP cast iron circulator designed for use in closed loop heating applications, such as radiant heating, baseboards, fan coils, etc.


  • Built-in motor protection for longer life and better performance.
  • Suitable for a wide range of applications, including radiant heating, hydronic heating, fan coil heating, solar and other system types.
  • Whisper-quiet operation for sound sensitive installations.
  • Includes (2) Gaskets (O-rings).

Technical Specifications:

  • Voltage: 115V;
  • Amperage: 0.74 Amps;
  • Hertz: 60 Hz;
  • Phase: 1;
  • Max Pressure: 145 psi;
  • Max. Temperature: 230F;
  • Flow Range: 0-17 GPM;
  • Head Range: 0-15 ft;
  • Horse Power: 1/25HP;
  • Body: Cast Iron;
  • Connections: Flanged, 1/2", 3/4", 1", 1-1/4";.


3 years manufacturer's warranty.
UP15-42F Circulator Pump, 1/25 HP, 115V has an average 4.9 out of 5 rating based on 12 user reviews.
so far so good....
By home owner (from ny,nf) on 1/26/2016
delivered on time..easy to install...quiet
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Works Great
By Inexperienced Lady (from Hartford, CT) on 11/11/2015
Great pump, excellent price, fast delivery. My old pump was making a screeching noise, replaced with this pump and it's now quiet again.
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Right part, right price
By Marty (from nevada) on 6/4/2015
bolted right up. It's extremely quiet. I'm very satisfied, was delivered on time. I would recommend to everyone.
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By Paul (from USA) on 2/14/2014
delivered as advertised in satisfactory condition.
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Liked the unit and it was easy to instal
By LeRoy a home owner (from Richardton N D) on 1/6/2012
Hesting unit in our house. It was very easy to install. The screws on the electric cap did not fit.
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Great pump
By MK (from Pine Bush, NY) on 12/14/2011
Used the Grundfos to replace a Taco 007 as the circulator in a baseboard hot water system. It's alot quieter than the Taco was both at the pump and throughout the house. Previously I could hear the pump humming through the pipes even on the second floor of the house. No humming noise with this Grunfos. I would buy this pump again for sure.
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Best Prices by Far !!!!
By Tooltyme (from Holland Patent, NY) on 10/13/2011
Product was shipped and delivered fast, and in perfect condition. Saved lots of $$$ ordering from you !!!! Thank You, Mark
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We not have heat on the first floor!
By Retired (from Dallas, PA) on 10/10/2011
Easy to install. Works fine. My second. This was on the first zone of a hot water system that heated our first floor. Second floor was by our first Grundfos pump.
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This is an excellent product
By millerm (from Syracuse, NY) on 10/6/2011
There are similar pumps available, but the Grundfos UP15-42F is well suited for residential heating systems; economical and reliable.
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By Lane (from Warminster) on 9/4/2011
Replaced an older leaking circulator with this one. Installation was easy. Recommend by flanges at same time.
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home use or not
By greg the fixer (from toledo, oh) on 7/14/2011
I went to switch out the pump at my home and am installing the same as coming out Grundfos 15-42f but read further and said this pump is cast iron. It seems like they dont recommend this for home use. Sounds like they recommend stainless "cast iron circulator designed for use in closed loop heating applications, such as radiant heating, baseboards, fan coils, etc.Grundfos..." Any comments if cast iron is safe to use, it is for hot water recirculating in my home.
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Pump works just as i thought it would.
By John the fixer (from Vancouver Wash) on 7/7/2011
Use the pump as a cirulating pump for hot water in my home
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I want to install this model (Part#: 59896155 ) on 1/2" copper line. Is there a 1/2" model or a 1/2" flange set that fits it? Or do I have to use reducers?
Read 1 answer
The most cost-effective means would be to use 3/4" flanges (part# 519601) with 1/2" C x 3/4" MNPT reducing adapters (part# AM-34). Alternatively, you can also use Taco 1/2" sweat bronze flanges (part# 110-522BSF) which are also compatible with this Grundfos model.
Answered on 10/26/2017 by PexUniverse Customer Service
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I have a up15-2frc with a check valve . Is there a new model number that I can order that is the same as the pump I already have. Thanks Tim
Read 1 answer
You can use UPS15-58FC model (part# 59896341). It has similar head/flow parameters at Speed 2 & 3 and has the same flange to flange dimensions as the UP15-42F (6.5").
Answered on 1/5/2016 by PexUniverse Customer Service
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I need to replace my pump and I currently have this model. What would be the advantages of using a 3-speed instead?
Read 1 answer
If this model works for you, there's no need to replace it with a different one. A 3-speed circulator has a manual Low/Medium/High switch which gives user the functionality of 3 pumps in one.
Answered on 9/16/2014 by PexUniverse Customer Service
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Pump seems to work well, but not consistently. Water comes out hot when the cold water is turned on. Plus when it does come out hot on either the hot or cold faucets, neither lasts long. Also, the pump does not distribute hot water throughout the whole house. I am having to unplug the pump in order to take a shower in the upstairs bath.
Read 1 answer
If you're using this circulator pump for pressure boosting applications, it will not work because it is not designed for such applications. Similarly, cast iron circulators are not intended for use in domestic hot water recirculating applications, as they corrode rather quickly when exposed to fresh (oxygenated) water. Instead, a stainless steel or bronze circulator pump is used. Your specific issue may not necessarily be associated with the above, but could originate from the way the system is piped or other system components, since circulator's operation is rather simple - it is either on or off.
Answered on 12/12/2012 by PexUniverse Customer Service
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