Grundfos Magna1 D 32-80 97924369 180mm Twin-Head Threaded Circulating Pump #3900 USED

GRUNDFOS MAGNA1D 32-80 180mm Twin-Head Threaded Circulating Pump (97924369) #3900 (USED)

This listing is for a Grundfos MAGNA1D twin-head wet-rotor circulating pump. MAGNA1D combines the energy-efficient permanent-magnet synchronous motor with an integrated frequency converter and dual heads to provide redundancy or parallel flow in heating and cooling circulation systems.

The pump uses a canned-rotor wet-rotor design with integrated electronics, eliminating mechanical shaft seals and delivering quiet, low-maintenance operation. Setup and monitoring can be performed via the on-pump interface or wirelessly with Grundfos GO Remote.

Condition: supplied as a used pump. The unit shows cosmetic wear consistent with previous service use. It is inspected prior to dispatch and confirmed operational.
Guarantee: supplied with our 6-month guarantee.

• Pump type: MAGNA1D twin-head wet-rotor circulator
• Connection: G 1¼" threaded unions (PN10)
• Port-to-port length: 180 mm
• Electrical supply: 1 × 230–240 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 32-80 180 (97924369) – 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 wet-rotor circulator
• MAGNA1D – twin-head version with dual heads for redundancy or higher flow

Is the pump maintenance-free?

Yes. The wet-rotor canned design with no mechanical seal results 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: #3900
We specialise in supplying quality pumps and equipment. This unit is supplied as a used pump, inspected prior to dispatch and supplied with a 6-month guarantee.