Grundfos Magna3 25-40 Circulator Pump

The Magna3 25-40 is a circulator pump complete with electronically controlled motors. ... Show More
The Magna3 25-40 is a circulator pump complete with electronically controlled motors. Show Less
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£625.20 RRP £406.38 £338.65
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MAGNA3 25-40

MAGNA3 – More than a pump With its unrivalled efficiency, all-encompassing range and built-in communication capabilities plus functionalities replacing system components, the MAGNA3 is ideal for engineers and specifiers looking to create high-performance systems for buildings. This pump in the Grundfos Master Class will fit both heating and cooling applications perfectly, making it the obvious choice for almost any building project – old or new.

The MAGNA3 is of the canned-rotor type, i.e. pump and motor form an integral unit without shaft seal and with only two gaskets for sealing. The bearings are lubricated by the pumped liquid. The innovative clamp with only one screw enables easy repositioning of the pump head. The MAGNA3 is a pump with no maintenance requirements and with extremely low Life Cycle Cost.

The pump is characterised by the following:

  • controller integrated in the control box
  • control panel with TFT display on the control box
  • control box prepared for optional CIM modules
  • built-in differential-pressure and temperature sensor
  • cast-iron pump housing (depending on model)
  • carbon-fiber-reinforced composite rotor can
  • stainless-steel bearing plate and rotor cladding
  • aluminium alloy stator housing
  • air-cooled power electronics

The MAGNA3 is a single-phase pump.

Characteristic features

  • FLOWADAPT and FLOWLIMIT (more than a pump function as it reduces the need for pump throttling valves).
  • Proportional-pressure control.
  • Constant-pressure control.
  • Constant-temperature control.
  • Constant-curve duty.
  • Max. or min. curve duty.
  • Automatic Night Setback.
  • No external motor protection required.
  • Insulating shells supplied with single-head pumps for heating systems.
  • Large temperature range where the liquid temperature and the ambient temperature are independent of each other.

Communication The MAGNA3 enables communication via the following:

  • wireless Grundfos GO Remote
  • fieldbus communication via CIM modules
  • digital inputs
  • relay outputs
  • analog input (more than a pump function as heat energy meter)

Motor and electronic controller The MAGNA3 incorporates a 4-pole synchronous, permanent-magnet motor (PM motor). This motor type is characterised by higher efficiency than a conventional asynchronous squirrel-cage motor. The pump speed is controlled by an integrated frequency converter. A differential-pressure and temperature sensor is incorporated in the pump.

More Information
Price £338.65
Manufacturer Grundfos
Guarantee 1 year guarantee
Flow Rate 103 Ltr/min
Pump Type Circulator Pump
Switch None
Duty Type Domestic
Manufacturers Part Number 97924244

Delivery and returns

  • Next Day Delivery

    Free Delivery

    On orders to UK Mainland Over £50 ex VAT*

  • Next Day Delivery

    Next Day Delivery

    Available on 1000's of products*

  • Weekend Delivery

    Weekend Delivery

    Available at extra charge to UK Mainland*

  • Easy Returns

    Easy Returns

    Warranty and Returns Contact:


Pump Sales Direct (PSD) offers a free standard delivery service (2-3 working days) to mainland UK*. The free standard delivery service relates to all pumps on our website and also individually purchased spares or accessories over the value of £50 (before VAT). Individual spares or accessories purchased under £50 will incur a £6.95 delivery charge.

PSD also offers a next day delivery service at a charge of £12.50*, provided we receive your order before 3:30pm Monday to Friday (excludes Weekends and Bank Holidays).

*Excludes UK Islands, Republic of Ireland, Northern Ireland and Scottish Highlands.

UK Delivery Charge Options:-

Standard Delivery (2-3 working days)* - FREE

Next Working Day Delivery (on orders placed before 3:30pm)* - £12.50

Next Working Day Delivery before 10.30 am (on orders placed before 3:30pm)* - £25.00

Next Working Day Delivery before 12.00pm (on orders placed before 3:30pm)* - £15.00

Saturday AM Delivery before 12.00pm*- £35.00

Scottish Highlands Standard Delivery - £25.50

UK Islands & Republic of Ireland Standard Delivery - £60.00

*Excludes UK Islands, Republic of Ireland, Northern Ireland and Scottish Highlands.

Pump Sales Direct Return Form

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