Grundfos JP 3-42 PM START Pressure Booster Set

The Grundfos JP 3-42 PM START pressure booster set is a compact system designed to increase water pressure in domestic applications, groundwater supply, and rainwater harvesting. It combines a single-stage self-priming centrifugal pump with an intelligent pressure manager that automates start and stop based on water demand.

Thanks to its robust design with corrosion-resistant materials and automatic operation, this unit ensures a constant water supply with minimal intervention and reduced maintenance.

Automatic Operation and Comfort

The system features a pressure manager that automatically starts the pump when water demand is detected (starts at 1.5 bar) and stops it when consumption ceases. This maintains constant pressure in the installation without the need for additional tanks.

• Automatic start at 1.5 bar
• Continuous operation while there is demand
• Automatic stop when there is no flow
• Constant pressure for greater user comfort

Hydraulic Performance

• Nominal flow rate: 3 m³/h
• Nominal head: 36.5 m
• Maximum suction lift: up to 8 meters
• Maximum working pressure: 6 bar

Its self-priming capability allows it to draw water from levels below the pump, even in the presence of air in the pipe, ensuring stable operation.

Applications

• Pressure boosting in single-family homes
• Water supply from wells or tanks
• Rainwater collection and reuse systems
• Domestic and garden irrigation

Materials and Construction

• Hydraulic body in AISI 304 stainless steel
• Impeller made of composite (PPO reinforced with fiberglass)
• Corrosion-resistant components for greater durability

Protections and Safety

• Integrated dry-running protection
• Built-in non-return valve
• Thermal motor protection against overheating

These features reduce the risk of breakdowns and extend the service life of the unit.

Motor and Electrical Data

• Input power (P1): 700 W
• Rated power (P2): 0.55 kW
• Power supply: 1 x 220-240 V / 50 Hz
• Rated current: 3.2 A
• Speed: 2850 rpm
• Protection rating: IP44
• Insulation class: F
• Capacitor: 14 µF / 450 V
• Cable length: 1.5 m with Schuko plug

Installation

• Inlet/outlet connections: 1" (ISO 228-1)
• Liquid temperature: 0 to 40 °C
• Ambient temperature: 0 to 40 °C
• Compatible liquid: clean water

Main Advantages

• Compact, ready-to-install system
• Automatic operation without additional tank
• High reliability with anti-corrosion materials
• Low maintenance and long service life
• Quiet operation thanks to sealed bearings