MQ3-45 Booster Pump, 1 HP, 115V
Brand: Grundfos
Part#: 96860195
Model: MQ3-45
Temporary Out of Stock
Usually ships: Upon availability
Grundfos MQ3-45 1HP Booster Pump (96860195) is a compact, all-in-one flow-based pressure boosting system, designed for domestic water supply applications. The Grundfos MQ3, with it's smart operation is both easy to install and reliable.
Grundfos MQ3-45 Booster Pump is ideal for pressure boosting from water storage tanks or from city water supply (maximum 45 psi inlet pressure) and is rated as high as 91.9ft of head. The Grundfos MQ3-45 is also a self-priming multistage centrifugal pump. It can self prime from a well depth of down to 26 feet within a maximum time of 5 minutes.

  • Complete system
  • Low noise
  • Built-in protective functions
  • Automatic reset
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Technical Specifications:
  • Voltage: 115V
  • Liquid temperature range: 32 .. 95 F
  • Rated flow: 13.2 US gpm
  • Rated head: 91.9 ft
  • Shaft seal: BVBP
  • Maximum operating pressure: 109 psi
  • Approvals on nameplate: UL,CUL
  • Pump housing: POM + 25% glass fiber
  • Impeller: PPO + 20% glass fiber-PTFE
  • Range of ambient temperature: 32 .. 113 F
  • Maximum operating pressure: 109 psi
  • Pipe connection: 1" NPT
  • Power input - P1: 1000 W
  • Main frequency: 60 Hz
  • Rated voltage: 1 x 110-120 V
  • Rated current: 9.2 A
  • Enclosure class (IEC 34-5): 54
  • Insulation class (IEC 85): B
  • Length of cable: 6.56 ft
  • Type of cable plug: NEMA
  • Net weight: 28.7 lbs
  • Gross weight: 34.2 lbs
  • Shipping volume: 1.94 ft3
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2 year manufacturer's warranty.
Write a Review
Helpful? Yes 3 No
good pump
This makes my second Grundfos pump the last one lasted six years before it started messing up.
By vbub101 (from Decatur Tennessee) on 10/31/2011
Helpful? Yes 2 No
grundfosmq3 pump
This is the third pump I have used and so far the best. I had it installed professionally but after watching the pro do it I''m sure anyone can.Rudy Resendez
By Rudy R. (from CA) on 11/04/2013
Helpful? Yes 2 No
Easy to install and works well.
I'm using this pump in a home that is on a village water supply but the water pressure was only 32 psi. I also installed a water pressure control valve in front of the pump to be able to adjust the output pressure from the pump. This combination worked well.
By John (from Livonia, NY) on 01/08/2012
Helpful? Yes 1 No
Grundfos mq pump
Easy to install for the simplest mind. Boasts excellent pressure. Extemely reliable for the past 4 years. Quiet and small. Plumbers hate this thing cause it saves the homeowner tons of money and problems.
By Greg the homeowner (from Arlington, washington) on 06/12/2011
Helpful? Yes 1 No
Verified Purchase
Great pump!!
Changed my old pump out for this new Grundfos, wow wha a difference! it's so quite, has a faster response time to fluctuations in pressure. My shower no more trickles its a waterfall. I actually have no bad things to say about this product. Thanks John
By jaymac15 (from Philadelphia, PA) on 02/02/2012
Helpful? Yes 1 No
Booster pump 1 hp Grundfos MQ3-45
[...]The pumps works excellent I have three showers in my house and it keeps the pressure up while everyone gets a shower. My city pressure was about 30 to 35 psi.Now I have a solid 65 psi and above. I installed the pump in same room as my washing machine. It runs very quiet when I shut the door you can bearly hear it. Its great to take a good shower I have a double headed shower nozzle now.
By Tim (from Centerville Ga.) on 07/03/2011
Helpful? Yes 1 No
Verified Purchase
Great pump, price, fast shipping
This is 2nd pump. First one ran house flawlessly 5 years 24x7. Think the pressure sensor is faulty or needed service. Bought this as backup and will get first serviced.
By John W. (from Scotts Valley, CA) on 09/20/2011
Helpful? Yes 1 No
Verified Purchase
I highly recommend this pump
This is our total house water pump from our 5K L underground tank and it works great.Our special hydro pressure R/O system can keep it busy till the R/O tank fills after use but once I figured out why the pump was going on 12 sec. off 60 sec.and repeated, no problem.Looking to have years of trouble free service.
By Osprey (from Puerto Penasco, Sonora, Mexico) on 09/26/2011
Helpful? Yes 1 No
Highly recommend!
The Grundfos MQ3-45 is a great inline pump. I"m using it to provide water from my rain water collection tanks to my pool and house. I have the pump near the tanks with more than 200 ft of 1" pipe to the house and pool. It's no problem for this pump which delivers 60+ psi water pressure no problem. It's easy to hook up and run and very quiet. The auto off feature is also nice for maintaining pressure and protecting against running dry. The only feature its lacking is the ability to control the water pressure level from the pump itself. I'm using an external pressure regulator. Ordering from PEX was easy and fast!
By Rich in Austin (from Austin, TX) on 10/17/2011
Helpful? Yes 1 No
So far So good
When they say "plug and play" they mean it. Simple to install. Much quieter then previous pump
By Drag Racer (from Bethlehem Pa.) on 11/30/2011
Helpful? Yes 1 No
Good while it lasts
I just purchased my 2nd Grunfos MQ3 in a 10 year period. Actually my 3rd pump (Grundfos replaced my 1st one free of charge due to a pressure switch issue covered under warranty).This pump works very well with my rain water collection system which services the entire house. It is very easy to install and runs flawlessly......until it dies, which you should expect after around 5 years.
By Dean R. (from Coupland, Texas) on 04/09/2012
Helpful? Yes 1 No
Verified Purchase
Water Booster Pump
This is my 2nd Grunfos pump. I recommend getting the cover if exposed to weather. One of the best water booster pumps made. Great quality at great price.
By Verified Buyer on 08/20/2015
Helpful? Yes 1 No
Works great!
I received the MQ3-45, and installed it to resolve my low water pressure from my city connection. My lawn sprinklers would not work properly using the city water, but they work fantastic, now that I've installed the Grundfos MQ3-45!! The pump was easy to install, and works as advertised...wish I had done this a long time ago. Thanks.
By Rod K. (from Ripon, CA) on 03/24/2013
Helpful? Yes 1 No
Verified Purchase
Best Pump Ever!
This is my 2nd one in 10 years. 1st one is still going strong, outdoors after 10 years...incredible! My community needed water pumped 120ft up to cistern and the well pump couldn't quite get it there. Engineers told us we needed a very expensive pump (over $2k) + hold tanks and special valves... So I told them about the MQ3-45 and we ordered it, installed it halfway up the line and bingo! 15GPM into the cistern all day long! The thing doesn't know how to fail. Highly recommend
By Wiley Coyote (from SB, CA) on 09/15/2015
Helpful? Yes 1 No
Verified Purchase
MQ3-45 Pump
Great pump. Workhorse. 1st pump ran for 7 years without fault and minimal maintenance...Great Product.
By Mark (from Vancouver WA) on 02/04/2016
Helpful? Yes No
Verified Purchase
We've struggled with cheaper products! Worth the investment!
By Harry & Harriet Homeowner (from Northern NY) on 08/23/2016
Helpful? Yes No
By JEFF DAPLUMBER (from CHICAGO) on 01/17/2012
Helpful? Yes No
came in the mail when said, love having water pressure again, easy to install, and price was better than any where else, excellent very happy with the results.
By Ruth D. (from Chelan, Washington) on 06/01/2013
Helpful? Yes No
Verified Purchase
Good product
This is a direct replacement for the same model that only lasted 3 years. May be due to power surge knocking out run capacitor. Replacement parts for these units are near impossible to locate, but the product is very simple and easily replaced with another unit. Hope to have one for a spare if the old unit can be repaired. Will be very handy. Was a bit disappointed in the delivery taking over a week from order date when it was quoted as 2-3 days. Was entirely without water during this time.
By Don (from Texas Hill Country) on 07/14/2015
Helpful? Yes No
Verified Purchase
MQ3-45 Pressure Pump
This is my second pump. The first lasted eight years. The newer one seems to have more pressure and may be because it is brand new. I like these pumps or I would not buy. If this one last as long or longer than the first n give me reliable performance I will continue to buy this product.
By Deadmnwalkn (from Tennessee) on 07/21/2016
Helpful? Yes No
Verified Purchase
Best Pump Around
I recently set-up a whole house RO system and after trying several inexpensive pumps, settled on a MQ3-45. It was more expensive but worth the money as it does everything that it's supposed to. No more trickles of water and no noisy pump. I highly recommend it.
By Dave J (from Sparks, NV) on 09/29/2016
Helpful? Yes -1 No
Had my first pump installed in 2006 by professional. Two months ago it started stopping intermittently. I called Grundfos, spoke to a plumbing supply company and no one could actually tell me how to trouble shoot it or what may be wrong. It was answers like, I think it may be this or that.I found a pump at (what a great company) for $418 with no tax and free shipping. It was delivered the next day and I had it installed in 15 minutes.I anyone needs a pump for parts, let me know.
By Paul S. (from Middletown RI) on 07/28/2012
Ask a Question
will there be water flow if the power goes out?
Helpful? Yes No
By PexUniverse Customer Service on 05/15/2015
I have an MQ3-45 pump installed to boost my water pressure. The pump worked fine until winter when I turned on my whole house humidifier. It is low flow and causes the pump to short cycle. It turns on for approximately 5 seconds and off for about 60 seconds. Is there an adjustment to correct this?
Helpful? Yes No
If you can limit the water supply to the humidifier so that it's under 0.3 GPM, the pump will not turn on. Otherwise you'll need to install an in-line well tank (such as Well-X-Trol by Amtrol).
By PexUniverse Customer Service on 12/27/2013
Is this mark III version?
Helpful? Yes No
By PexUniverse Customer Service on 12/10/2013

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