Grundfos JP3-42-PM1 Self Priming Jet Pump (Flow 57 LPM)

18.00 KGS
(2 reviews) Write a Review
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Grundfos JP PM Booster provides the comfort of constant water pressure with automatic start and stop controlled according to consumption by the intelligent pressure manager. JP PM includes dry-running protection that automatically stops the pump in case of dry running. 

This means lower risk of pump damage and lower maintenance costs. The anti-cycling function will stop the pump in time in case of a minor leakage in the system, or if a tap has not been closed completely. When cycling occurs, the pump stops, and an alarm will be indicated. A non-return valve for backflow prevention is already integrated.

JP PM consists of a Grundfos JP pump and a Grundfos Pressure Manager PM 1. JP pump is a self-priming, single-stage centrifugal jet pump. The jet pump has excellent suction capacity and is designed for long and trouble-free operation. The built-in ejector with guide vanes ensures optimum self-priming properties. The pressure manager starts the pump at 1.5 bar and the pump keeps running as long as there is flow. 

The design is robust and built upon corrosion-free materials to ensure a long lifetime. This booster set ensures optimum self-priming properties, featuring a suction-lift up to 8 meters. The self-priming pump also ensures a stable operation as is it able to lift liquid from below the inlet level and can handle a mix of air and liquid until the pump reaches a fully-primed pumping condition.

The JP pump has built-in thermal protection, which immediately stops the pump if it overheats. The motor is air cooled and equipped with oversized, sealed, greased-for-life ball bearings to ensure silent operation and minimum service.


The boosters are suitable for domestic water supply, where pressure boosting and self-priming is needed.

  • Domestic ground water intake
  • Domestic water pressure boosting
  • Domestic rainwater harvesting

The product can be used in a wide variety of applications, such as these:

  • single- and two-family houses, boosting the pressure of water coming from a break tank, roof tank or a well
  • garden irrigation
  • car wash
  • small-scale agriculture and horticulture
  • light commercial applications


  • Self-priming, featuring a suction lift of up to 8 m
  • 1" (25mm) Suction and Discharge
  • Robust design and corrosion-free materials for a long lifetime
  • Automatic start/stop according to consumption
  • Dry-running protection to avoid damage of the pump
  • Anti-cycling for leakage detection to prevent overheating and save energy
  • Integrated non-return valve
  • Status indication: power on, pump running, alarm
  • Rotary outlet connection for easy adaption to local pipe system.

Motor / power: 440W
Max. flow: 
1″F / 25mm
1″M / 25mm
Start pressure: 
PM1 – 1.5 bar
Warranty on pump: 
2 Years

2 Reviews Hide Reviews Show Reviews

  • 5
    Good pump

    Posted by Ian R on 3rd May 2024

    Good pump - easy to install

  • 4
    water pump

    Posted by Graham Downie on 20th Feb 2023

    pump seem fine,does the job. time will tell on life