Grundfos Magna1D 40-80 F 220 Flanged Pump Heating Circulator 240v Dn40 99221308 Model C #4900 USED

Grundfos MAGNA1 D 40-80 F 220 Model C – 240V Twin-Head Flanged Heating Circulator Pump (99221308) #4900 USED

This listing is for a Grundfos MAGNA1 D 40-80 F 220 Model C high-efficiency twin-head canned-rotor circulator pump with DN40 PN10 flanged connections and a 220 mm port-to-port length. It is designed for clean heating, cooling and building-services circulation systems where reliable variable-speed performance and twin-head resilience are required.

Condition: supplied as a used pump. The unit has been previously installed/used and may show cosmetic wear consistent with service use. It is inspected prior to dispatch. Guarantee: supplied with a 6-month guarantee.

• Pump type: MAGNA1 D Model C twin-head canned-rotor circulator
• Grundfos product number: 99221308
• Model/version: Model C
• Connection: DN40 PN10 flanged
• Port-to-port length: 220 mm
• Electrical supply: 1 × 230 V / 240 V class, 50/60 Hz
• Power input: P1 18.4–276 W
• Current: 0.20–1.25 A
• Maximum head class: 8 m
• Maximum flow: approximately 24 m³/h / 6.7 L/s
• Maximum operating pressure: 10 bar
• Liquid temperature range: -10 °C to +110 °C
• Minimum inlet pressure: 0.10 bar at 75 °C, 0.50 bar at 95 °C, 1.00 bar at 110 °C
• Net weight: 32.3 kg
• Energy efficiency index: EEI 0.23
• Control: proportional pressure, constant pressure or constant curve / constant speed
• Twin-head function: wireless alternating operation between the two pump heads
• Design: glandless canned-rotor pump with no conventional mechanical shaft seal

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

Manufacturer product page

Full technical specifications, curves and documentation can be viewed on the official Grundfos product page:
View Grundfos MAGNA1 D 40-80 F (99221308) – Variant curves

Technical documentation

The MAGNA1 Model C technical data PDF can be viewed here:
View Grundfos MAGNA1 Model C technical data PDF

Typical applications

• Heating systems and boiler circuits
• Commercial building-services circulation
• District heating and district cooling
• Air-conditioning and chilled water systems
• Mixing loops and plant-room circulation
• Ground-source heat pump and solar-heating systems
• Replacement of matching DN40 twin-head circulators

Frequently Asked Questions

What does the model number mean?

• MAGNA1 – Grundfos high-efficiency circulator range with simple control and monitoring
• D – twin-head pump
• 40 – nominal diameter of inlet and outlet ports, DN40
• 80 – maximum head class, 80 dm / approximately 8 m
• F – flanged connection
• 220 – port-to-port length in millimetres
• Model C – MAGNA1 pump version shown on the nameplate

What does the twin-head design do?

The MAGNA1 D has two pump heads mounted on a common body. Twin-head pumps are commonly used where duty/standby operation, alternating operation or improved service resilience is required.

On MAGNA1 D Model C pumps, the twin-head function allows the two pump heads to communicate wirelessly and operate in alternating mode. Normally one pump head runs at a time, with changeover every 24 hours or if one pump head registers an alarm.

What control modes are available?

MAGNA1 Model C has simple onboard control with LED indication. The available operating modes are:

• Proportional-pressure control – useful where system pressure losses vary with flow demand
• Constant-pressure control – useful where a stable pressure is required across changing flow demand
• Constant curve / constant speed – runs the pump on a fixed curve, similar to a traditional fixed-speed circulator

The pump is selected using the control button on the pump. Grundfos GO can also be used for selected functions such as adjusting the proportional-pressure setpoint, managing the fault-relay trigger setting in twin-head pumps, and reading warning/alarm indications.

Is this suitable to replace other DN40 twin-head circulators?

This model uses DN40 PN10 flanged connections with a 220 mm port-to-port length. Where dimensions and duty are comparable, it can replace other DN40 twin-head in-line circulators from brands such as Wilo, Lowara and KSB, subject to hydraulic duty, flange standard, electrical supply and control compatibility.

The advantage of an electronically controlled circulator is that it can often be adjusted during commissioning to better match the required duty of the pump being replaced, rather than being locked to one fixed-speed curve.

What liquids can this pump be used with?

MAGNA1 is suitable for thin, clean, non-aggressive and non-explosive liquids that do not contain solid particles, fibres or mineral oils. Typical uses include heating water, chilled water and clean circulation duties.

Water/glycol mixtures may be used up to 50%, but glycol concentration and temperature affect viscosity, performance and pump selection. The system should be cleaned and flushed before glycol is added, and the glycol mixture should be maintained according to the supplier’s instructions.

Not suitable for:

• Liquids containing solid particles or fibres
• Flammable, combustible or explosive liquids
• Diesel, petrol, mineral oils or aggressive chemicals
• Sea water or aggressive saline solutions
• Dirty water, wastewater or drainage applications

Can this be used on domestic hot-water systems?

MAGNA1 pumps are listed by Grundfos for domestic hot-water systems, but suitability depends on water quality, temperature, local regulations and pump housing material. This pump is the cast iron housing version, not the stainless-steel N version. For domestic hot-water applications, Grundfos strongly recommends stainless-steel pumps to reduce corrosion risk.

Grundfos also recommends using MAGNA pumps in domestic hot-water applications only where water hardness is below approximately 14 °dH, and keeping the liquid temperature below 65 °C to reduce the risk of lime precipitation. Please check the full system requirements before ordering.

What minimum inlet pressure is required?

The required minimum inlet pressure depends on liquid temperature. For this pump family, the relevant guidance is:

• 75 °C: 0.10 bar
• 95 °C: 0.50 bar
• 110 °C: 1.00 bar

The inlet pressure and system pressure should always be checked against the installed duty, liquid temperature and manufacturer documentation before commissioning.

Does this pump have a mechanical shaft seal?

No. MAGNA1 is a canned-rotor circulator, meaning the pump and motor form an integrated wet-rotor unit without a conventional mechanical shaft seal.

Does this pump need external motor protection?

No external motor protection is normally required. The pump incorporates overload protection, but the electrical installation must still be carried out correctly and in accordance with local regulations.

Why choose MAGNA1 instead of MAGNA3?

MAGNA1 is usually chosen when you need a reliable, energy-efficient circulator with simpler setup and lower cost. MAGNA3 adds more advanced features such as expanded monitoring, energy metering and additional communication/control options.

Is this a new pump?

No. This item is supplied as used. It has been inspected prior to dispatch and is supplied with a 6-month guarantee.

About Our Stock

Stock code: #4900
We specialise in supplying used and surplus pumps. This unit is inspected prior to dispatch and supplied with a 6-month guarantee.