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Grundfos MQ-3-45 (1HP) On Demand Pump

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  • 96860195
  • MQ 3-45
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This Pump has been Discontinued. See below for the MQ Successor
$35.00 (Fixed shipping cost)

 Product Description

The Grundfos MQ 3-45 has been DISCONTINUED by the manufacturer. Its replacement is the
MQ Successor 3-45, an "on demand" pump that offers slightly higher flow/pressure performance and better functionality. Available in 115V and 220V.  
MQ3-45 On Demand Pump

This very reliable, compact, all-in-one, flow-based pump is designed for boosting water pressure. Ideal for boosting from water storage tanks (maximum 40 psi inlet pressure). It is a 1 HP single phase 115V/230V pump with a rated flow of up to 20 GPM at low pressure and a max operating pressure boost of of 60 psi at low flow. With an average performance of 5GPM at 50PSI it is ideal for many rainwater harvesters.

This unit is ideal for pressurizing water from a water storage tank, and boosting existing low water pressure. However if there is existing pressure that needs to be boosted by the MQ, the pressure of the water line going into the MQ must be pressure limited to 30 PSI maximum. This is ensured by installing a PRLV-30 pressure limiting valve. Warranties are not valid on MQ’s that are used in a pressure boosting application without a PRLV-30. A PRLV-30 must be purchased with the MQ pump and installed with the pump. 


  • Low noise
  • Auto-reset
  • User friendly control panel
  • Self-priming
  • Built-in, self protect function
  • No maintenance required
  • 2 Year Manufacturer Warranty


  • 1 HP
  • 115V or 230V
  • Liquid temperature range: 32 .. 95 F
  • Rated flow: 20 US gpm
  • Rated head: 91.9 ft
  • Maximum operating pressure: 109 psi
  • Cable length: 6.56'
  • NEMA plug type

NOTE: Max Inlet Pressure = 40 PSI

Data Sheet
Installation and Operating Instructions
Product Guide
Brochure #2

More Details:
The Grundfos MQ-3-45 is rated as high as 91.9ft of head. This pressure boosting system is a self-priming, multistage, centrifugal pump. It's capable of self-priming from a depth of 26 feet within 5 minutes. Well suited for pumping potable water and rain water. Easy installation. If exposed to dry running, excessive temperature, or any overload condition, the pump will stop automatically, preventing a motor burnout. Note: This pump should be used indoors or covered and insulated if used outdoors.

    Rated flow:  20 US gpm
    Head max:  145 ft
    Shaft seal:  BVBP
    Approvals on nameplate:  CSACUS
    Curve tolerance:  ISO 9906:1999 Annex A
    Pump version:  A
    Model:  B
    Pump housing:  POM + 25% glass fiber
    Impeller:  PPO + 20% glass fiber-PTFE
    Material code:  A
    Range of ambient temperature:  32 .. 113 °F
    Maximum operating pressure:  109 psi
    Connect code:  B
    Pipe connection:  NPT 1
    Liquid temperature range:  32 .. 95 °F
    Switch:  on/off switch included
    Net weight:  30 lb
    Gross weight:  34.2 lb
    Shipping volume:  1.94 ft³
    Sales region:  Namreg


 Other Details

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