Circulation pump Grundfos MAGNA3 100-120 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: 38 m³/h
Rated head: 10.08 m
Maximum head: 120 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: 1564 W
Mains frequency: 50 / 60 Hz
Rated voltage: 1 x 230 V
Maximum current consumption: 7 A
Net weight: 34.4 kg
Gross weight: 38.2 kg

The MAGNA3 100-120 F PN6 is a high-performance wet-rotor circulation pump designed for very large flow applications. With its advanced AUTOADAPT™ function, it automatically adjusts to the real demand of the system, ensuring stable operation, reduced energy consumption, and long-term reliability in large residential complexes, hotels, office buildings, or commercial facilities.

Typical applications

• Central heating systems with radiators, underfloor heating, or mixing circuits
• Domestic hot water recirculation loops for instant availability
• Cooling and air-conditioning circuits with heat exchangers
• Geothermal loops for pumping and recirculation

Key advantages

The MAGNA3 100-120 F PN6 combines a robust cast-iron body with a reinforced impeller for extended durability. Integrated dry-run protection, a thermal insulation shell, and intelligent electronic control guarantee safe operation and optimal performance under demanding conditions.

Model-specific notes

• PN 6 flanged version, suitable only for installations with a maximum operating pressure of 6 bar
• Installation must be carried out by certified professionals, following Grundfos manuals and local regulations
• Hydraulic conditions (duty point and fluid temperature) should be checked to avoid cavitation; proper venting and adequate inlet pressure are required
• For heat generators: use only approved flue-gas systems and follow all manufacturer guidelines for installation, inspection, and maintenance
• For gas appliances in combined systems: all installation, servicing, and adjustments must be performed exclusively by authorised contractors
• Before setting up a new heating system, prior consultation is recommended to consider local heat planning requirements and possible risks of non-profitability, particularly due to rising CO₂ costs