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1 HP Pressure Booster Pump & Cover - Grundfos MQ3-45

This product has been discontinued by the manufacturer. If you need something similar, please contact us or browse our full catalog.
1 HP Pressure Booster Pump & Cover - Grundfos MQ3-45 1 HP Pressure Booster Pump & Cover - Grundfos MQ3-45 1 HP Pressure Booster Pump & Cover - Grundfos MQ3-45
1 HP Pressure Booster Pump & Cover - Grundfos MQ3-45
Images may be inaccurate. See specs table below to ensure accuracy.
All-in-one pressure booster unit
Easy to install & operate
22 Gallons/Minute
Self-priming & Dry-running protection
This Product was Discontinued by the Manufacturer


The Grundfos MQ is a compact pump and pressure boosting unit, purpose-designed for domestic water supply and other applications where a compact and reliable, easy-to-install pump is advantageous. The MQ is a self-priming multistage centrifugal pump; it self-primes from a well depth of down to 26 ft (8 m) within 5 minutes.

The MQ is a complete, all-in-one unit, incorporating pump, motor, diaphragm tank, pressure and flow sensor, controller and check valve.


  • water pressure boosting
  • water supply from wells
  • private homes
  • farms
  • market gardens & large gardens

Features and benefits

Complete system

The MQ is a compact, "plug and pump" or all-in-one solution; there is no need for a separate pressure tank, pressure switch, electrical connections, fittings, or any other separate items. No maintenance of the pump is required. Two versions are available to choose from.


Installation of the MQ is simple and can be done in a matter of minutes, which means greatly reduced installation costs. Outlet connnection can be angled up to 5° to fit existing pipework.

Simple operation

The MQ features a user-friendly control panel with ON/OFF button and indicator lights for indication of the operational state of the pump.

Compact design

Compact, horizontal design fits even where space is limited (outdoor applications require the use of the Protection Cover, sold separately); no space around the pump is required.


As it is self-priming, the MQ is able to pump water from a level below the pump. Provided it is filled with water, the pump is able to lift water from a depth of 26 ft (8 m) in less than 5 minutes. This facilitates installation and start-up of the pump and provides more reliable water supply in installations where there is a risk of dry running and leakages in suction hose or pipes.

Built-in protective functions

Built-in protective functions; if exposed to dry running, excessive temperature, or any overload condition the pump will stop automatically, thus preventing a motor burnout.

Automatic reset

In case of dry running or a similar alarm, the pump will stop. Restarting will be attempted every 30 minutes for a period of 24 hours. The reset function can be deactivated.

Low noise level

Superior hydraulics and internal cooling combined result in very quiet operation, which makes it suitable for many applications.

Pressure tank

The built-in pressure tank reduces the number of starts and stops in case of leakages in the pipe system, causing less wear on the pump.

How the MQ functions

The MQ pump has a small built-in pressure tank, sufficient to ensure that water is readily available from the tap. When water is required, the pump automatically starts. A non-return valve prevents backflow.

The controller ensures that the pump starts automatically when water is consumed and stops automatically when the consumption ceases. In addition, the controller protects the pump in case of faults.

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Additional Information

Store ID X4547106
Manufacturer Info
Product Part # MQ3-45 / 96860195
Manufacturer Grundfos
Installation Instructions Grundfos MQ3-45 Instruction Manual
Product Manual Grundfos MQ3-45 Owner's Manual
Weight (lbs) 33
Horsepower 1
Pump Connection Female NPT
Power Type Electric
Pump Start Electric Start
Maximum Flow Rate (gpm) 22
Maximum Pressure (psi) 45
Product Type Pump
Shipping Info
Shipping Locations Mississippi
Shipping Zip Codes 38654
Liftgate Option Yes
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