Circulation pump Grundfos MAGNA3 100-40 F PN6

The Grundfos MAGNA3 circulation pump is the ideal choice for almost any building project, old or new. With its unrivaled energy efficiency, comprehensive range, and built-in communication capabilities, the MAGNA3 is ideal for engineers and designers who want to create high-performance heating and cooling systems. The pump is maintenance-free thanks to its encapsulated rotor design. This also means that the pump and motor form an integral unit with no shaft seal and only two gaskets for sealing. The bearings are lubricated by the pumped liquid. The MAGNA3 has an intuitive display and allows it to connect wirelessly with the Grundfos GO Remote app, giving access to advanced reporting and monitoring. The pump includes fieldbus communication via CIM modules, analog and digital inputs, and configurable relays. Control features include FLOWADAPT, which reduces the need for throttle valves, thus cutting costs on system components.

Rated flow: 24.91 m³/h
Rated head: 4.806 m
Maximum head: 40 dm
TF class: 110
Type of connection: DIN
Size of connection: DN 100
Pressure rating for connection: PN 6
Port-to-port length: 450 mm
Maximum power input – P1: 493 W
Mains frequency: 50 / 60 Hz
Rated voltage: 1 x 230 V
Maximum current consumption: 2.35 A
Net weight: 33.4 kg
Gross weight: 38.2 kg

The Grundfos MAGNA3 100-40 F PN6 is designed for buildings where dependable heating, constant hot water and efficient cooling are essential. With its advanced control technology, the pump adjusts automatically to the actual demand of the system. This means lower operating costs, whisper-quiet performance and a comfortable indoor climate in apartment blocks, hotels, office buildings or commercial centres.

Where it works best

• Central circulation in heating systems with radiators, floor heating or mixed circuits
• Domestic hot water recirculation for instant availability at the tap
• Cooling and air-conditioning loops, including heat exchangers
• Geothermal and energy-efficient recirculation circuits
  

Key advantages for operators

The MAGNA3 delivers measurable energy savings through intelligent AUTOADAPT™ control. Stable circulation prevents temperature swings and ensures comfort in every room. Built-in dry-run protection increases reliability, while durable materials guarantee long service life. Commissioning is quick, and ongoing maintenance is simple for facility teams.

Benefits for facility managers

Choosing this model reduces lifetime operating costs and lowers the risk of unplanned downtime. It helps maintain predictable performance and supports a steady indoor climate for occupants and staff.

Why the MAGNA3 series stands out

Grundfos equips the series with smart control algorithms that automatically balance hydraulics, without complicated manual adjustments. Whether for modern underfloor heating or demanding cooling circuits, the MAGNA3 adapts to system needs and delivers efficiency day after day.

Model-specific notes you need to know

• Professional installation required: the unit is not plug-ready and must be installed by authorised HVAC specialists.
• System compatibility: PN6 flanged version — suitable only for installations with a maximum operating pressure of 6 bar, using PN-6 flanges and gaskets.
• Hydraulics & fluid: confirm the duty point and medium temperature, ensure sufficient inlet pressure and vent properly to avoid cavitation.
• Compliance & safety: always follow Grundfos manuals for installation, operation and maintenance, and check local regulations before commissioning.
• Gas appliances & heat generators: any combined systems must be handled exclusively by certified companies to guarantee safety and compliance.