The Grundfos MAGNA3 50-120 GF N (product number 99833475) is a variable-speed ECM circulator for hydronic heating, cooling and domestic hot-water systems, delivering up to 39.37 ft of head and 68.2 US gpm. Its permanent-magnet motor and integrated controller give an energy efficiency index of EEI 0.19 — well inside the 0.23 ErP benchmark, and a fraction of the draw of a fixed-speed circulator. Power input modulates from 20.7 W to 554 W with demand.
Performance & Hydraulic Data
| Maximum head | 39.37 ft |
| Nominal flow | 68.2 US gpm |
| Nominal head | 15.75 ft |
| Maximum speed | 3930 rpm |
| Maximum operating pressure | 174.05 psi |
| Pipe connection pressure rating | PN 12 |
| Energy efficiency index (EEI) | 0.19 |
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F.
Motor & Electrical Data
| Rated voltage | 115 V |
| Phase | 1 |
| Frequency | 60 Hz |
| Maximum power input (P1) | 554 W |
| Minimum power input (P1) | 20.7 W |
| Maximum rated current | 4.85 A |
| Minimum rated current | 0.37 A |
| Insulation class | F |
| Enclosure class | IPX4D |
| TF class | 110 |
Materials of Construction
| Pump housing | Stainless steel — EN 1.4308 — ASTM A351-CF8 |
| Impeller | Composite |
Connections & Operating Limits
| Pipe connection | GF53 |
| Connection type | GF |
| Port-to-port length | 11 1/16 in |
| Liquid temperature range | 14 to 230 °F |
| Ambient temperature range | 32 to 104 °F |
Dimensional Drawing
Approvals, Weights & Identification
| Grundfos product number | 99833475 |
| EAN | 5713834923951 |
| Approvals | cETLus, Proposition 65 |
| Net weight | 39.7 lb |
| Gross (shipping) weight | 44.1 lb |
| Country of origin | United States |
| HS / customs tariff code | 8413.70.2005 |
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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