Home » Grundfos MAGNA1 32-100 Circulating Pump & High Efficiency Central Heating Circulator
SKU: 99221236
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Grundfos MAGNA1 32-100 Circulating Pump & High Efficiency Central Heating Circulator

Grundfos
£1,100.00 Inc. VAT £916.67 Exc. VAT
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The Grundfos MAGNA1 32-100 is a compact, variable speed circulating pump built to keep hot water and heating systems running efficiently while cutting electricity costs. Fitted with a permanent magnet synchronous motor and an integrated frequency converter, it automatically adjusts its speed to match real time system demand, so you only pay for the energy you actually need.

Its sealed, canned rotor construction means there are no shaft seals to wear out and no routine maintenance to schedule, giving you a genuinely fit and forget pump. With a standard 180mm port to port length and G2″ connection, it's a straight forward drop in replacement for most older circulators, saving on labour and re-piping costs.

Whether you're upgrading a domestic boiler system, servicing a commercial heating circuit, or specifying a pump for a ground source heat pump installation, the MAGNA1 32-100 delivers reliable performance backed by Grundfos engineering.

Key Features & Benefits

High Efficiency Motor

Permanent magnet synchronous motor cuts electricity use significantly compared with older fixed speed circulators.

Smart Speed Control

Integrated frequency converter automatically matches flow and head to actual system demand.

Wireless App Monitoring

Compatible with the Grundfos GO Remote app for wireless setup, adjustment and diagnostics from a smartphone.

Maintenance Free Design

Canned rotor construction with no shaft seal, lubricated by the pumped liquid, for long, trouble free service life.

Fault Relay & Remote Start/Stop

Built in fault relay and digital start/stop input give full control and peace of mind for BMS integration.

Wide Operating Range

Handles liquid temperatures from -10°C to +110°C, covering both heating and chilled water applications.

Easy Drop In Replacement

Standard 180mm port to port length and G2″ connection fit straight into most existing installations.

Excellent Energy Rating

Energy Efficiency Index (EEI) of 0.20 comfortably exceeds minimum ErP 2015 industry standards.

Technical Specifications

Specification Detail
Brand Grundfos
Range / Model MAGNA1 32-100
Manufacturer Part Number (MPN) 99221236
EAN 5712608942099
Connection Size G 2″ (32mm nominal diameter)
Port to Port Length 180mm
Maximum Head 10 metres
Power Input Range Approx. 8 - 178 W
Voltage / Frequency 1 x 230V, 50/60 Hz
Maximum Operating Pressure 10 bar (PN10)
Liquid Temperature Range -10°C to +110°C
Ambient Temperature Range 0°C to +40°C
Motor Type Permanent magnet synchronous, canned rotor
Body Material Cast iron
Energy Efficiency Index (EEI) ≤ 0.20 (ErP 2015 compliant)
Connectivity Grundfos GO Remote (wireless app control)
Compatibility Heating, cooling, underfloor heating & heat pump systems
Warranty Grundfos manufacturer warranty (standard terms apply)

Ideal Use Cases

Domestic Heating Upgrades

A straight forward, energy efficient replacement for older, less efficient circulators in homes.

Commercial Heating Circuits

Suited to larger buildings needing reliable, continuous circulation with reduced running costs.

Underfloor Heating Manifolds

Provides consistent, adjustable flow for underfloor heating emitter circuits.

Chilled Water & Cooling Systems

A wide liquid temperature range makes it equally effective in fan coil and chilled water loops.

Ground Source Heat Pump Systems

Handles brine and water side circulation for geothermal heat pump installations.

Secondary & Mixing Loops

Well suited to blending loops and secondary circulation in zoned, multi circuit systems.
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs

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