Question about Grundfos Pumps Grundfos MQ 3-45 1 HP Pressure Boosting Pump

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Low pressure from grundfos pump to house

Low pressure at kitchen , very weak at attic tank and shower does not work

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  • 293 Answers

Does your system equipped with pressure tank (pneumatic tank)? If it has, maybe it's already filled with water due to some pinhole leaks. Drain the tank and see what will happen.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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One of my HG shower systems has increasingly lower volume. The shower head and supply hose are fine. what should I check next?


If you are using water in another part of the house most times the pressure at the bathroom shower will go low. For instance if some one in the kitchen draws water in the kitchen sink this will make the shower water even turn cooler because of low pressure. Flushing the toilet will also do the same.
Most houses are plumbed with half inch water pipe and would work a lot better if it was three quarter inch to give more water pressure.

Jan 12, 2015 | Hansgrohe Home

1 Answer

No shower pressure in rv


Make sure you have enough water in the tank or city water hooked up. A pump will run and suck air if the level is low. it could force water to the sink, etc, but not the shower.

Are your valves for the water pump set correctly? Remote possibility someone installed a shut-off valve between the pump and shower.

Could be the pump is getting weak/leaking internally and can't build enough pressure.

Make sure the shower head is not clogged. Remove it from the hose and try again.

Apr 22, 2014 | RVs

2 Answers

How does pressure tanks work


Pressure tanks do just that in a water system. They create pressure for water to flow when the water pump is on the off cycle. A manifold is plumbed into the tank from the main line coming from the well. The main water line continues to the house plumbing from the manifold. So it's line from pump to manifold - to tank, and from manifold to main into house. The manifold also has tappings for the pressure gauge and the pressure switch. The pressure tank creates water pressure. The water does not flow through the tank. Pressure tanks also have to be 'tuned' or adjusted to the low end pressure set by the pressure switch. Actually the tank pressure needs to be set 2psi below the low end pressure. Most residential water systems are set to operate between 20 -40, or 30-50 psi, which is set by the pressure switch, which in turn , turns the water pump on and off. So if a system operates between 20 and 40 psi, the pre-charged pressure of the tank should be 18 psi. Pre-charged means the tank is drained of water with the water pump OFF. The tank pressure is then checked adjusted by way of the air valve on top of the tank ( A tire gauge works). Pressure tank mainfolds are a common plumbing part.

Mar 19, 2014 | Utilitech 20-Gallon Vertical Pressure Tank...

1 Answer

I have low pressure at house, There is no problem


I am just guessing but it appears there is a restriction such as a partally closed valve.

Sep 01, 2013 | Grundfos Pumps Grunfos UP15-42F 1/25 HP...

1 Answer

Triton t200re shower


Paul. Is it only the shower that the pump cuts out? i dont think we have these pumps in AU. Would bet that its a flow issue. Either remove the water saving device in the shower, if there is one. Pr turn another tap on just a dribble when you start the shower?
We have these issues with "smart"? controllers that think there is a leak

May 19, 2013 | Grundfos Pumps Grundfos MQ 3-45 1 HP...

1 Answer

Grundfos pump switches on & off continuously with


if you have a pump for the whole house you need to check the bladder tank. there is a air valve on the top. Check the pressure with a tire gauge you should have at least 20 PSI this will stop the pump from the on and off thing.

You can compress air yuo can not compress water. thats why the ballder tank. As the pump work to shut off pressure it is compressing air. then when you use a little water the pump does not run until a large about is run then the pump will re fill the system

Best of luck

R J

Sep 05, 2011 | Plumbing

1 Answer

I just bought a repo house which has a grundfos circulation pump u p 15 installed at the water heater. House built 2005 4260 sq. Feet. House has 4 showers only one of them gets hot water. All sinks get hot...


that pump is likely to be a hot water return pump not a booster pump. it sound like a large property so its likely the hot water system requires balancing to get the hot water to the extreme areas. If all the hot outlets have some form of isolation valve try closing all but the affected areas and see if hot water comes out. If so only open the closed outlets enough to give you reasonable flow. This hopefully will force the hot water to the affected areas.

May 20, 2010 | Home

1 Answer

House pressure water pump has to be reset to


it sounds like a relay for the auto shut off ....http://www.smarter.com/water-pumps/grundfos-mq3-35-3-4-hp-pressure/pd--ch-47--pi-11277834.html

Jan 16, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...

1 Answer

My pump stays on after having a shower sometimes...


The pump will start and stop with a pressure switch that is mounted in the discharge of the pump. Sometimes pressure switches get sticky and won't shut off when they are supposed to. You can buy them at most hardware stores, the most common is a Square D, and you'll need to both connect it to the pipe and also to the power line and the pump motor.

Sep 13, 2009 | Grundfos MQ3-45 1 HP Pressure Booster...

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