Grundfos Magna1 D 50-100 F 99221341 Twin head circulator pump #NL155/4800

GRUNDFOS MAGNA1D 50-100 F – Twin-Head Circulator Pump (99221341) #NL155/4800

This listing is for a Grundfos MAGNA1D twin-head wet-rotor circulator pump. MAGNA1D combines the high energy efficiency of a permanent-magnet synchronous motor with an integrated frequency converter and two pumping heads, providing flexibility for redundancy or parallel flow in heating and cooling circulation systems.

The pump uses a maintenance-free canned-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: MAGNA1D twin-head wet-rotor circulator
• Connection: DN50 flanged (PN6/10)
• Port-to-port length: 280 mm
• Electrical supply: 1 × 230 V, 50 / 60 Hz
• 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.

Manufacturer product page

Full technical specifications and performance curves can be viewed on the official Grundfos product page:
View Grundfos MAGNA1D 50-100 F (99221341) – Variant details

Frequently Asked Questions

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.

What’s the difference between MAGNA1 and MAGNA1D?

• MAGNA1 – single-head circulator
• MAGNA1D – twin-head version for redundancy or higher flow

Is the pump maintenance-free?

Yes. The wet-rotor canned design has no mechanical shaft seal, resulting in very low maintenance and quiet operation.

Can this replace older fixed-speed pumps?

Yes — subject to hydraulic and connection match. The variable-speed electronics in a MAGNA1D can deliver significant energy savings compared with traditional fixed-speed circulators, but system duty and connection type should be confirmed before replacement.

About Our Stock

Stock code: #NL155/4800
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.