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Grundfos MQ3-45 Mark III Pump

  • Grundfos MQ3-45 Mark III Pump

Grundfos MQ3-45 Mark III Pump

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Availability: Typically In Stock

Regular Price: $1027.00
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Grundfos MQ3-45 1 HP Pressure Booster Pump:

The Grundfos' MQ pump is compact and extremely easy to install. The pressure switch and tank are already built into the MQ. Furthermore, it is selfpriming and water-cooled with a very low noise level. The outlet pipe connection can be angled up to 5° to fit your existing pipe-work. The Grundfos' MQ pump is simple and easy to operate. The settings are clearly indicated on the user-friendly control panel with indicator lights for Pump on/off, auto reset, and an alarm indicating dry running or overheating. Grundfos MQ is built for trouble-free operation. It's construction from corrosion-resistant materials means it can be used for ultrapure water. The anti-cycling feature prevents the pump from repeatedly starting and stopping in the event of a dripping tap or a minor leak. If there is no water available, the pump will stop to protect itself and restart automatically when water is available again.  The Grundfos MQ makes it easy to select the right water booster pump. The MQ is an all-in-one unit with two models to choose from.  There is no need to worry about a separate pressure tank, pressure switch, electrical connections, fittings or any other separate items. With MQ, it is literally a matter of connecting the power and turning on the jet pump. Installation of an MQ pump is simple and can be done in a matter of minutes.


  • The MQ pump has built-in dry-run protection. If the pump runs dry, the pump automatically stops.
  • It will then attempt to restart every half hour for a maximum of 24 hours until water is available from the source.
  • If more than 24 hours pass without water, the pump must be restarted manually.
  • The auto reset function can also be disabled.
  • The Grundfos MQ pump also has built-in thermal protection.
  • If the pump overheats it immediately stops.
  • After a 30-minute cooling-down period, the pump will automatically restart


  • The Grundfos MQ is specially designed for use in domestic applications where low noise is a major consideration.
  • The pump is cooled by the pumped water which eliminated the need for a noisy cooling fan.
  • Since the pump is self-cooling, you don’t need to have free space around the pump for cooling purposes. 
  • The MQ "anti-cycling" feature prevents the pump from continuously starting and stopping when you have a dripping tap or minor leak in the system.


  • Flow range: 0 - 20 U.S. GPM
  • Head range: 0 - 139 FEET
  • System pressure: Up to 109 psi
  • Voltage Range:  110-120V or 220-240V
  • Inlet pressure: Max. 45 psi
  • Suction lift: Max. 26 ft
  • Liquid temperature: 32°F to +95°F
  • Ambient temperature: 32°F to +113°F
  • Inlet and outlet connections: 1" IPS
  • Warranty:  2 Years

Specs / Warrantty

Availability Typically In Stock
Manufacturer Grundfos
Select Fitting Size No
Select Tank Size No
Choose Test No
TDS Monitor No
Add RO Membrane No
Choose Finish No
White Powder-Coated Frame No
SS Membrane Housing No
Add A Tank Valve No
Select Tubing Color No
Select Stenner Tube No
Voltage No
Choose Flow No
Housings No
Choose Size No
Option No
Finish No
Chose Size No
Float Switch No
Misting Bar Color No
Add Tank Valve No
Feet of Misting No
Select Quality Light No
Select Output Rate No
Select Tank Option No
Choose Micron Size No
Select Roller Assembly No
Select Tube No
Choose Model No
Capacity No
Select Faucet Color No
USA Made Membrane No
Faucet Type/Color No
Select Packaging No
Choose Filter Size No
Add NXT Controller No
Choose UV GPM No
Choose Size/Capacity No
Inlet Size No
Filter Options No
Add Rain Roof No
Select Lamp, Quartz Sleeve, Or Ballast No
Size No
Select Water Supply No
Choose Pipe Size No
Select Filter Pack No
Package Size No
Grade No
Select Tube Color No
Select Tube Size No
Select Lamp Or Quartz Sleeve No
Tubing Size No
Model No
Select Test Kit No
Select Voltage No

Customer Reviews

good Review by Patrick
good so far (Posted on 5/1/13)

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