The Grundfos MAGNA3 40-80 GF (product number 98126800) is a multistage centrifugal pump rated 46.7 US gpm at 17.72 ft, driven by a motor.
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F. Head (H) and efficiency (η) against flow (Q); lower chart shows power and NPSH required.
Performance & Hydraulic Data
| Rated flow | 46.7 US gpm |
| Rated head | 17.72 ft |
| Maximum operating pressure | 174.05 psi |
Materials of Construction
| Impellers & chambers | Composite |
Motor & Electrical Data
| Frequency | 60 Hz |
| Enclosure class | IPX4D |
Connections & Operating Limits
| Connection type | GF |
| Pressure rating | PN 12 |
| Liquid temperature range | 14 °F to 230 °F |
Approvals, Weights & Identification
| Approvals | cETLus, Proposition 65 |
| Grundfos product number | 98126800 |
| EAN | 5710629499622 |
| Net weight | 32.7 lb |
| Gross (shipping) weight | 46.7 lb |
| Country of origin | United States |
| HS / customs tariff code | 8413.70.2005 |
Typical Applications
Water supply and pressure boosting • reverse osmosis and filtration feed • water treatment • boiler feed • industrial process • HVAC • irrigation.
Need help? Contact ForeverPure Place for pricing, lead time, accessories, or help selecting the correct model for your application.
Accessories for This Pump
Commonly specified alongside Grundfos E-pumps. Send us your pump nameplate and we will confirm the correct part for your exact build and voltage before you order.
- RPI Inlet Pressure Sensor
Inlet pressure protection with low-suction shutdown. 
VFS Flow & Temperature Sensor
Flow and temperature feedback to the pump’s onboard controller.- RPS Pressure Sensor
Discharge pressure feedback for constant-pressure booster control.
Building-automation connectivity
This pump accepts a Grundfos CIM interface card (or an external CIU box) to report to a BMS or PLC. All eight are the same card with a different protocol — choose the one your building system speaks:
CIM/CIU 100 GENIbus · CIM/CIU 150 PROFIBUS DP · CIM/CIU 200 Modbus RTU · CIM/CIU 250 Modbus TCP · CIM/CIU 300 BACnet MS/TP · CIM/CIU 500 EtherNet/IP · CIM/CIU GRM · CIM/CIU LonWorks
