Grundfos MAGNA1 25-100 N Variable Speed Pump 240V Stainless Steel 99221226 #4307

GRUNDFOS MAGNA1 25-100 N 180 – Stainless Variable-Speed Circulator Pump, 230–240V (98254908) #4307

This listing is for a Grundfos MAGNA1 N wet-rotor circulator pump. MAGNA1 N combines the high energy efficiency of a permanent-magnet synchronous motor with an integrated frequency converter, providing reliable variable-speed circulation control for heating and cooling systems.

The N version is the stainless steel housing variant of the MAGNA1 range, selected where improved corrosion resistance or media compatibility is required. The pump uses a maintenance-free canned-rotor wet-rotor design with integrated electronics. Setup and monitoring can be carried out via the onboard interface or wirelessly using Grundfos GO Remote.

Condition: supplied as surplus / unused stock. The unit may show cosmetic marks consistent with storage and handling. It is inspected prior to dispatch.
Guarantee: supplied with our 2-year guarantee.

• Pump type: MAGNA1 N single-head wet-rotor circulator
• Pipe connection: G 1 1/2" (threaded)
• Pressure rating for connection: PN10
• Port-to-port length: 180 mm
• Electrical supply: 1 × 230–240 V, 50 / 60 Hz
• Maximum operating pressure: 10 bar
• Motor: permanent-magnet synchronous (PM)
• Control: integrated frequency converter with user interface
• Communication: Grundfos GO Remote compatible

Need help confirming suitability?
Call us on 01803 220416 for technical advice.

Typical applications

• Heating systems and mixing loops
• Radiator and underfloor heating circuits
• Air-conditioning and chilled water systems
• Ground-source heat pump systems
• Small chiller and light commercial circulation duties

Manufacturer product page

Full technical specifications and performance curves can be viewed on the official Grundfos product page:
View Grundfos MAGNA1 25-100 N (98254908) – Variant details

Frequently Asked Questions

What does the model number mean?

• MAGNA1 – high-efficiency variable-speed wet-rotor circulator range
• 25 – nominal connection size / series (threaded connection size)
• 100 – hydraulic performance series / head class
• N – stainless steel housing version
• 180 – port-to-port installation length in millimetres

What does the “N” mean on MAGNA1 N?

The N designation indicates the stainless steel housing version of the MAGNA1 range. This variant is selected where improved corrosion resistance or media compatibility is required compared with the standard cast iron housing.

Is MAGNA1 N suitable for domestic hot water / potable water?

Yes. The MAGNA1 N range is specifically offered with a stainless steel pump housing for applications where the liquid requires it, including domestic hot water duties.

As with any circulation pump, final suitability depends on the full system design, applicable local regulations, and compliance with Grundfos installation and water-quality guidance for the specific application.

Why choose a MAGNA1 instead of a MAGNA3?

The MAGNA1 is intended for users who need a high-efficiency, reliable circulator without advanced BMS features. Compared with MAGNA3:

• MAGNA1 offers simpler setup and operation with lower cost
• Ideal where only basic control modes are required
• Still provides major energy savings via PM motor and integrated drive
• Includes fault relay and digital start/stop input

Choose MAGNA3 when you need:

• Advanced flow estimation and heat-energy monitoring
• Full building management communication (BACnet / LON)
• Multi-pump cascade and advanced control functions

For straightforward HVAC circulation where simplicity and efficiency are the priority, MAGNA1 is usually the better value choice.

Is the pump maintenance-free?

Yes. MAGNA1 uses a canned-rotor wet-rotor design with no mechanical shaft seal, eliminating routine seal replacement and providing very quiet operation.

How is the pump controlled?

The controller and operating panel are integrated into the pump. The pump can be:

• Set directly using the onboard user interface
• Monitored via the fault relay output
• Started and stopped remotely via the digital input
• Connected wirelessly using Grundfos GO Remote

What makes the motor efficient?

MAGNA1 uses a permanent-magnet synchronous motor controlled by an integrated frequency converter. This provides higher efficiency than conventional asynchronous motors and automatically adapts pump speed to match system demand.

About Our Stock

Stock code: #4307
We specialise in supplying quality pumps and equipment. This unit is supplied as surplus stock, inspected prior to dispatch and supplied with a 2-year guarantee.