Grundfos Magna1D 65-120F 340 Flanged Pump Heating Circulator 240v 99221380 #4331 USED

GRUNDFOS MAGNA1D 65-120F 340 – Flanged Heating Circulator Pump 240V (99221380) #4331 (USED)

This listing is for a Grundfos MAGNA1D twin-head wet-rotor circulator pump. MAGNA1D combines the energy-efficient permanent-magnet motor and integrated frequency control of the MAGNA1 family with a twin-head arrangement for redundancy or parallel operation in HVAC circulation systems.

MAGNA1D’s design integrates motor and electronics in a maintenance-free wet-rotor assembly. The pump communicates wirelessly with the Grundfos GO Remote app and supports basic monitoring and control without separate external drives.

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

• Pump type: MAGNA1D twin-head wet-rotor circulator
• Connection: DN65 flanged (PN6/10)
• Port-to-port length: 340 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 65-120F 340 (99221380) – 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 parallel flow

Is the pump maintenance-free?

Yes. MAGNA1D uses a canned-rotor wet-rotor design with no mechanical seal, resulting in very low maintenance and quiet operation.

Can this replace older fixed-speed pumps?

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

About Our Stock

Stock code: #4331
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.