The Grundfos MAGNA3 50-180 GF (product number 99833480) is a variable-speed ECM circulator for hydronic heating, cooling and domestic hot-water systems, delivering up to 59.06 ft of head and 85 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 21.8 W to 794 W with demand.
Performance & Hydraulic Data
| Maximum head | 59.06 ft |
| Nominal flow | 85 US gpm |
| Nominal head | 24.61 ft |
| Maximum speed | 4680 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) | 794 W |
| Minimum power input (P1) | 21.8 W |
| Maximum rated current | 6.96 A |
| Minimum rated current | 0.39 A |
| Insulation class | F |
| Enclosure class | IPX4D |
| TF class | 110 |
Materials of Construction
| Pump housing | Cast iron — EN 1561 EN-GJL-250 — ASTM A48-250B |
| 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 | 99833480 |
| EAN | 5713834924132 |
| Approvals | cETLus, Proposition 65 |
| Net weight | 41.9 lb |
| Gross (shipping) weight | 48.5 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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