Model # 96860172

Internet #204317249

Grundfos MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump


MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump

$72272 /each

Frequently Bought Together

Product Overview

The Grundfos MQ is a compact, all-in-one, flow based, plug-and-play pressure boosting system, designed for domestic water supply applications such as homes, cabins, cottages, farms as well as gardens. The pump is suitable for pumping of potable water and rain water. The MQ, with it's smart operation is both easy to install and reliable. The MQ is a complete, all-in-one unit, incorporating pump, motor, diaphragm tank, pressure and flow sensor, controller and check valve. Built in safeties ensure long life of the pump. These safeties include: dry running; excessive temperature; any overload conditions. The MQ is a self priming pump and needs no priming other than that at installation. The MQ is a plug-n-play system.

  • Complete system
  • Low noise
  • Built-in protective functions
  • Automatic reset
  • Compact, easy to install
  • Rated flow: 13.2 U.S. GPM

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Will this pump work on gravity flow water?

Asked by: J60
Yes. You put it in line with the gravity flow source.
Answered by: WetNWGarageGuy
Date published: 2017-01-10

Can this pump be used with a presser tank?

Asked by: Sam
Actually it can. I used it that way for a number of years. It does not need the pressure tank however. The pump has a very small pressure tank which pushes the water when you initially open a valve. The pump as a flow sensor which will detect the motion of water and turn on the pump, which stays on till the flow stops. If you use with a pressure tank the flow will be more variable because the water won't be flowing from through the pump as quickly. It also means the pun doesn't cycle as much which could help with pump life. But I've used the same pump without a tank for years not without issue. Much simpler setup to use without the tank and I think a better experience.
Answered by: WetNWGarageGuy
Date published: 2017-01-10

inlet pressure

should I use a pressure regulator on the suction side, local codes require a max. discharge of not more then 80 psi for domestic use ? also the suction side of the city water connection is 3/4 in.. will reducing to that size cause any problems ? the water lines in the interior of my home are 3/4 to 1/2 inch. I know I can't change the volume, will the pump maintain the pressure when more then 1 outlet is opened thank you
Asked by: budd
Dear Valued Home Depot Customer, We reached out to MFG for more information and below is their response. “ call 1-800-955-5847 to contact Grundfos " Thanks The Home Depot User Generated Content Team
Answered by: THDCustomerService
Date published: 2015-09-20

Why won't my pump shut off

Asked by: pita
This product has a pressure switch that turns on the pump when it senses pressure drop which is another way of saying water flow. If your pump is running constantly that leaves two possibilities First there could actually be flow running through the unit that it is sensing thus it is appropriately coming on. This could be caused by a leak somewhere that you were unaware of. I would check this by closing off the water supply to the unit. It the pump turns off you know you have a problem elsewhere. If the pump continues to run you now know that the pressure switch is stuck in the on position and it needs to be repaired. In that case I would contact the Grundfos tech line to further trouble shout the unit. There number is 1 800 333 1366
Answered by: chris
Date published: 2017-04-05
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Customer Reviews

MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump is rated 3.8 out of 5 by 5.
Rated 4 out of 5 by from 4 Star Review Rating provided by a verified purchaser
Date published: 2017-04-06
Rated 5 out of 5 by from Works Great! I have been using these pumps for about 8 years now and they seem to be the most dependable for the price. Great product and easy to install. In the past i have changed things around and needed replacement parts and it was easy to get them though the manufacturer. We have one pump that feeds our entire house with no issues, the rest of our applications are in the workplace and are running at high demand with no issues at all. Pricing at the Home Depot was cheaper then our commercial account at the local plumbing supply chain. This is a great product, and i highly recommend it.
Date published: 2016-05-24
Rated 1 out of 5 by from Buyer Beware - Bad Pump! Original MQ-35 pump lasted 8+ years, was a great pump! Replacement lasted only 4 months of light residential duty than started leaking. 3rd replacement leaked within 48 hours. Must have had a bad run on shaft seals. Can't keep installing this pump until they resolve the issue. Customer service is limited, website requires email and than wait for response, unacceptable. Can't currently recommend this product, unfortunately had to go with another manufacturer.
Date published: 2016-10-12
Rated 4 out of 5 by from Paid new for used I opened the carton to find the unit was previously used. The owners manual had notes in the margins and areas hi-lited. The unit works ok. I just was very disappointed to pay full price for a unit that obviously was not new.
Date published: 2016-09-27
Rated 5 out of 5 by from Awesome pump! VERY easy install! No plumber needed with the help of a couple 1 inch shark bite metal water hoses with 1 inch female threaded ends!
Date published: 2015-10-27
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