Grundfos

Model 96860172

Internet #204317249

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

$535.46 /each

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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.

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Customer Questions & Answers

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

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2 answers

inlet pressure

This question is from MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump
Asked by
edison n.j.
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April 10, 2015
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
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Answers (2)

May 22, 2015
Answer: 
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
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April 27, 2015
Answer: 
I don;t quite follow your question and don;t want to give you bad info. So please call and we can discuss your specific need,. Chris 1 978 651 3301
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1 answer

I have poor water pressure throughout my house, except when I use a high-pressure washer

This question is from MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump
Asked by
Worcester, MA
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June 25, 2016
My house is about 25 years old, built to code, and has always had weak water pressure. If someone is taking a shower, don't flush a toilet! Also, the pressure is better downstairs than upstairs.
We've learned to live with it, but recently using a gas-powered pressure washer, I got to thinking: the pressure washer did fine, as strong a flow as expected, plenty volume. So I wonder if that describes a pressure problem, and whether a pressure boosting pump is the solution? I read one of the other answers, and will do the pressure test and gallons per minute test as well.

And as long as I am asking, do these pumps just work on demand? Are they noisy? Are there combination pumps with filters? My coarse-grain house filter is ready for replacement. I will likely pay a plumber to install.

Thanks
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June 27, 2016
Answer: 
I just read your question and I am so glad you read my other response about pressure vs volume as I thought I was going to have to repeat myself. In the right application these pumps can be a relatively inexpensive fix. They sense the flow and spin up adding 45PSI. I would not call them silent but I would not call them noisy either. Call me when you know your pressure and flow. We can discuss your Read More
I just read your question and I am so glad you read my other response about pressure vs volume as I thought I was going to have to repeat myself. In the right application these pumps can be a relatively inexpensive fix. They sense the flow and spin up adding 45PSI. I would not call them silent but I would not call them noisy either. Call me when you know your pressure and flow. We can discuss your specific need. However I will say that I find it highly unlikely that you have a pressure differential in your home. I think you will find that you have constant pressure but different flow rates do to changes in pipe size and a limited incoming flow rate. I had a local customer who could not take a satisfying shower. In the end his pressure was find. His ancient water main had rusted almost shut. So the water was coming through a space the size of a straw in the center of a corroded pipe. The city wanted $5000 to change it but when if breaks they will replace if for free. He did not have the money. As his pressure was find he added a well tank. This is a storage tank with a diaphragm in the center. The city system fills this tank and stores the water under pressure. Now when he takes a shower he is using a combination of stored water and incoming water. So he can take a shower that works. After about 10 minutes the storage is empty and he is back to just incoming water. But this solution, without a pump has made it good enough. Chris 978 651 3301 Read Less
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1 answer

If I only need more pressure at my outside spigot, where should it be installed? At the main, or near the spigot?

This question is from MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump
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June 21, 2016
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June 22, 2016
Answer: 
Your question brings me concern that you may not have a pressure problem at all but instead have a volume problem. Pressure is both consistent across the system and invisible. Often I get calls from people that say I have good pressure in the kitchen but bad in the shower; or something like that. NO, the pressure is basically the same throughout the house and can not be assessed by eye. You need a Read More
Your question brings me concern that you may not have a pressure problem at all but instead have a volume problem. Pressure is both consistent across the system and invisible. Often I get calls from people that say I have good pressure in the kitchen but bad in the shower; or something like that. NO, the pressure is basically the same throughout the house and can not be assessed by eye. You need a gauge. What the person is describing to me is poor volume. Poor volume can not be cured with a pressure booster. What you need is more water. Often this involves adding storage. A pressure booster will not bring the water into the house faster or make up for insufficient water supply. I will admit that pore volume and low pressure are often exist together. But to say you only have a pressure problem one fixture leads me to believe your problem is volume. Volume can be seen with the eye, pressure can not. Further I would add that a 1/3 of these units come back with complaints of leaking, when used as pressure boosters. The reason is these units add a fixed amount of pressure; 45 PSI. People install them on systems that have inadequate water supply, but fine pressure; say 50 PSI. Now they add the booster and they are up to 90 PSI and stuff starts to leak. I would strongly suggest you or anyone believing they have an issue do the following. First buy a pressure gauge that hooks on to a hose bib at The Home Depot and check your pressure. In fact check it a few times over a few days and see if it is consistent. Then take a 5 gallon pale and see how long it takes to fill it. Do this as close to the where the main comes into the house. Once you know the PSI and GPM of your water supply. you can determine if you have a pressure, volume or combined problem, and look at options that are going to give you what you want. Not being able to run multiple sprinkler heads is typically not a pressure issue but a water supply issue. I live on the beach; thus I am at sea level and the water tower is up on a mountain in my town. As a result my un-reduced pressure is 120 PSI. Yet my showers are weak because the water main is 150 years old and full of rust. Amazing pressure but no flow. I hope this helps and feel free to give me a call. Chris 978 651 3301 Read Less
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Will this pump work on gravity flow water?

This question is from MQ3-35 3/4 HP 115-Volt Pressure Boosting Pump
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Brusett, MT
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April 30, 2016
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May 13, 2016
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It should but I would need more information about the application to offer an opinion. Chris 978 651 3301
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Customer Reviews

Rated 5.0 out of 5 by 2 reviewers.
Rated 5.0 out of 5.0 by 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. May 24, 2016
Rated 5.0 out of 5.0 by 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! October 27, 2015
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