The Grundfos MAGNA3 25-100 (product number 97924247) is a variable-speed ECM circulator for hydronic heating, cooling and domestic hot-water systems, delivering up to 32.81 ft of head and 23.9 US gpm. Its permanent-magnet motor and integrated controller give an energy efficiency index of EEI 0.18 — well inside the 0.23 ErP benchmark, and a fraction of the draw of a fixed-speed circulator. Power input modulates from 9 W to 153 W with demand.
Performance & Hydraulic Data
| Maximum head | 32.81 ft |
| Nominal flow | 23.9 US gpm |
| Nominal head | 20.58 ft |
| Maximum speed | 4530 rpm |
| Maximum operating pressure | 145.04 psi |
| Pipe connection pressure rating | PN 10 |
| Energy efficiency index (EEI) | 0.18 |
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F.
Motor & Electrical Data
| Rated voltage | 230 V |
| Phase | 1 |
| Frequency | 50 / 60 Hz |
| Maximum power input (P1) | 153 W |
| Minimum power input (P1) | 9 W |
| Maximum rated current | 1.33 A |
| Minimum rated current | 0.09 A |
| Insulation class | F |
| Enclosure class | IPX4D |
| TF class | 110 |
Materials of Construction
| Pump housing | Cast iron — EN 1561 EN-GJL-200 — ASTM A48-200B |
| Impeller | Composite |
Connections & Operating Limits
| Connection type | G |
| Port-to-port length | 7 1/8 in |
| Liquid temperature range | 14 to 230 °F |
| Ambient temperature range | 32 to 104 °F |
Dimensional Drawing
Approvals, Weights & Identification
| Grundfos product number | 97924247 |
| EAN | 5710626493227 |
| Approvals | CE,VDE,EAC,MOROCCO,UKCA |
| Net weight | 11.3 lb |
| Gross (shipping) weight | 12.9 lb |
Typical Applications
Hydronic heating and chilled-water circulation • domestic hot-water recirculation • radiant floor loops • boiler primary and secondary loops • air-handling and fan-coil circuits • geothermal ground loops.
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