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  • 48 hours delivery, if you order before 5:00 pm
  • Package collection at one of our 2,500 pickup points
  • Over 100,000 customers ordered before you

Grundfos MQ3-45

    • Grundfos MQ 3-45 Booster Pump

    Availability: In stock

    Special Price $ 559.00


    • In stock, delivery in 2 workdays
    • 2 year warranty
    • Delivery the day after tomorrow
    • This product is not available for pickup at a pickup point.
    • Multiple shipping options

    Description of the Grundfos MQ3-45

    Brief specifications

    • Pump capacity: 4,100 l/h
    • Delivery head 44 m / Pressure 4.4 bar
    • Switches on/off automatically and with dry-running protection
    • Quiet and suitable for continuous operation
    • Suitable for irrigation / recycling rainwater

    Pros and cons

    • Absolute top quality
    • Can run continuously
    • Quiet
    • Dry-running protection
    • Integrated pump control
    • Space-saving design
    • Resistant to limescale and rust
    • High operational reliability
    • Small water-storage tank

    The Grundfos MQ booster pump is a compact water-supply system, designed for domestic, agricultural, and horticultural purposes. This very compact system consists of a pump, motor, pressure valve, and regulator, all of which are combined within an integrated unit. This self-priming pressure-boosting model is equipped with a non-return valve on its suction side, and has built-in protection to prevent the motor from overloading and overheating.  Furthermore, the pump is also protected from running dry. Because of its extremely quiet operation (54DB), this pump can easily be set up within the house.

    The Grundfos MQ is available in two models:

    • Grundfos MQ3-35
    • Grundfos MQ3-45

    Suitable for drinking water

    Opting for the Grundfos pressure-booster pump is an excellent choice because this pump is suitable for drinking water and is multifunctional. It can be used as a pressure-booster pump with storage tanks (maximum 3-bar inlet pressure), and, for example, for supplying water from sources (maximum 8-metre suction height).  The pump is easy to install and to set up. The adjustable angle of the delivery connection allows for easy connecting. The easy control panel has a start/stop button as well as indicator lights to show its status. Please note that this is a self-priming booster, so it may also pump air.

    Protection system

    An ideal thing about this pump is its auto-restart facility. If the pump is at risk of running dry or experiences a similar failure, it will stop automatically. The pump will then try to restart every 30 minutes over a 24-hour period. With its innovative, built-in leak-detection facility, the pump will warn you in the event of a leakage. The built-in pressure vessel will reduce the number of times the pump switches on and off, thereby preventing unnecessary wear and tear.


    The MQ pump is designed for supplying water and increasing pressure, and suitable to use:

    • in homes
    • in holiday cottages and weekend accommodations
    • at farms
    • in vegetable and other large gardens.

    This pump is suitable for pumping drinking water and rainwater.

    Features and advantages

    • All-in-one pressure-boosting unit
    • Easy to install
    • Easy to operate
    • Self-priming
    • Dry-running protection
    • Quiet
    • Maintenance-free


    • Provides sufficient pressure and capacity for about four sprinklers
    • The hose that can be used for this pump has a diameter of 1" for the delivery connection and 1" for the suction connection
    • Draws water from a maximum depth of 8 metres
    • The maximum delivery head is 44 metres, which equals 4.4 bar output

    Contents of the kit

    • Grundfos MQ3-45 Booster Pump
    • Manual


    This pump is labelled as being 'quiet'. Of course, like any electric appliance, a pump can be heard, but special attention has been given to its noise level. Thanks to its ultra-low noise level, the pump is highly suitable to be placed indoors, without being disturbing. The perception of noise is subjective, of course, but no other pumps are quieter than these.

    Stainless steel / Inox

    In some situations, stainless steel, which is also called Inox steel, can be very handy, and is prescribed in particular with regard to drinking water. Drinking water must remain pure and may not contain corrosive elements, which is the reason that stainless steel is used. Furthermore, a stainless steel pump is also resistant to lime, which tends to stick to surfaces, but is not able to do so with smooth, stainless steel surfaces. Cast iron is usually the counterpart of stainless steel, but these pumps are prone to corroding and are therefore used mainly for irrigation. A final advantage of stainless steel is that it is lighter than cast iron and is therefore easier to move.


    Grundfos is one of the largest pump manufacturers in the world. They have managed to obtain a substantial share in the industrial market, and have achieved this by supplying the highest quality products over a period of several decades. As a result, Grundfos pumps are currently used in many installations and situations. Not surprisingly, your central heating system may also be fitted with a Grundfos circulation pump. Grundfos was originally a Danish company but it is now represented in many countries all over the world. In addition to manufacturing central heating pumps and targeting the industrial market, Grundfos also sells several garden and booster pumps, and has a line of very robust, high-quality submersible pumps.

    Dry-running protection

    The name says it all: this pump is protected from running dry. Most pumps cannot, if at all, operate dry for long, which usually ends in the pump immediately burning out and/or seizing. For example, this could happen if the source has run dry and the pump can no longer draw water from it. Garden and booster pumps are particularly sensitive to running dry. Some borehole pumps and somewhat more advanced garden pumps are already equipped with built-in dry-running protection. Others can be easily fitted with a dry-running protection system: for example, with a separate one or with the DAB Control-D. This definitely guarantees that the garden or booster pump will not run dry.

    Automatic activation / deactivation

    This pump switches on or off automatically if you open or close a water point that is connected to the pump. In many cases, this feature is a considerable advantage: for example, when irrigating a garden with a hand-held sprayer, or supplying a toilet or washing machine with rainwater. It is also useful if you want to increase the water pressure in your home. Unlike standard garden pumps, booster pumps - because of the difference in pressure - 'notice' when one or more water points are opened or closed. This is how the pump knows that it needs to start or stop. Standard booster pumps (which are mounted to a tank) are equipped with a mechanical switch, and the more advanced ones have electronic switches. Both systems have advantages and disadvantages. The mechanical switch is reliable but can either not be set or it is difficult to do so, while the electronic version can be set but is dependent on electricity.


    Types of water this product can pump

    Yield table

      • 44 meter
      • 40 meter
      • 750 liter p/u
      • 35 meter
      • 1.550 liter p/u
      • 30 meter
      • 2.200 liter p/u
      • 25 meter
      • 2.750 liter p/u
      • 20 meter
      • 3.300 liter p/u
      • 15 meter
      • 3.800 liter p/u
      • 10 meter
      • 4.100 liter p/u
      • 5 meter
      • 4.100 liter p/u
      • 0 meter
      • 4.100 liter p/u
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    Specifications of the Grundfos MQ3-45

    General information

    • - Grundfos MQ 3-45 Booster Pump
      - Cable connection 2 m
      - Manual
    • Grundfos
    • 2 year warranty
    • 5700396723532

    Physical specifications

    • 1"
    • 1"
    • Technopolymer and stainless steel
    • 13,3 kg
    • 57 x 21,8 x 32 cm

    Technical information

    • 230 Volt
    • 1.000 Watt
    • 55 dB
    • 0°C - 35°C
    • 2 m


    • Booster pump
    • Garden irrigation, Increase water pressure in the house / apartment, Rainwater use within / around the house, Water supply for cattle
    • 4,100 l/h
    • 44 m / Pressure 4.4 bar
    • 8 m
    • Max. 4 pieces

    Types of water this product can pump

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    Accessories of the Grundfos MQ3-45

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    Manuals of the Grundfos MQ3-45

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