Grundfos Magna1 D 50-100 F 99221341 Twin head circulator pump #NL155/4800
£2,495.83GBP
inc VAT
Technical overview
About these figures
These figures provide simplified information for searching, filtering and initial comparison. They are not a complete specification. Exact details depend on the model and configuration.
Power rating: Usually the motor’s rated mechanical output (P2). Electrical input power (P1) is a different value. Check the product’s nameplate or manufacturer’s documentation to confirm which rating applies.
Outlet size: The nominal size class is expressed on a millimetre basis: for example, DN40 denotes a nominal 40 mm size. It does not specify the exact measured opening, connection type, thread, flange drilling or pressure rating.
Head and flow: Indicative figures describing the pump’s performance envelope, rather than a single operating duty point. Do not assume maximum flow is available at maximum head, or that every combination within the ranges is achievable. Minimum figures do not establish safe continuous operating limits. Consult the relevant performance curve.
Check the product description, nameplate and manufacturer’s documentation before selection or installation. Please contact us before purchasing if you need help confirming suitability or connection details.
| Nominal voltage | 240v |
| Rated power | 0.433 kW |
| Nominal outlet size (mm) | DN 50 |
| Port-to-Port Length | 280.0 mm |
| Shipping Weight | 50.0 kg |
| Package Dimensions | 50.0 × 70.0 × 50.0 cm |
| Indicative maximum head | 10.0 m head (1.0 bar) |
| Indicative maximum flow | 29.0 m³/h (8.1 L/s) |
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.
Specification & guidance notice: Technical information and FAQ content are provided in good faith based on manufacturer literature and industry experience. Descriptions of hydraulic types and application suitability represent general guidance only and do not constitute a guarantee of performance. Actual results will depend on system design, pipework losses, media characteristics, and installation conditions. Please consult the manufacturer & thier documentation and satisfy yourself that the equipment is suitable for your specific application prior to purchase.