Grundfos · Commercial Circulator
MAGNA1
11 models, 19-58 ft max head, up to 301 GPM per pump, cast iron housing for closed heating and cooling loops.
Up to 58 ft Head, 301 GPM
ECM Variable Speed, Simple Control
115-230V 1Ph or 115V 1Ph or 208-230V 1Ph
Cast Iron Housing
Liquid 14 to 230°F
175 psi Working Pressure
Flanged, Grundfos GF Pattern
Composite Rotor Can, Wet Rotor
Overview
The MAGNA1 is the simple-control member of the MAGNA family: the same efficient permanent-magnet hydraulics as the MAGNA3, set with a push-button panel instead of a display. It is a direct, energy-saving replacement for fixed-speed commercial circulators in heating and cooling systems.
- Three proportional-pressure, three constant-pressure and three constant-curve settings, selected at the push-button panel
- Permanent-magnet ECM motor with integrated frequency converter: a direct, efficient replacement for fixed-speed circulators
- Alarm relay and external start/stop as standard
- Insulating shells for heating systems supplied with single-head pumps
What Ships and What It Needs to Run
Included: the MAGNA1 circulator with insulating shells; flange gaskets and bolts per Grundfos packaging.
Ships: about 11-75 lb by model.
Needed to run: matching companion flanges (GF pattern; flange kits sold separately), isolation valves, and a 115-230V 1Ph or 115V 1Ph or 208-230V 1Ph circuit with fusing per the manual.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
24-Month Grundfos Warranty
Covered for 24 months from the date of installation, but not more than 30 months from the date of manufacture, under Grundfos’s published limited warranty.
Specifications
| Pump type |
Wet-rotor, electronically controlled circulator, in-line flanged |
| Motor |
Permanent-magnet ECM with integrated frequency converter, built-in motor protection |
| Power supply |
115-230V 1Ph, 115V 1Ph, 208-230V 1Ph, 60 Hz |
| Liquid temperature |
14 to 230°F |
| Ambient temperature |
-4 to 104°F |
| Maximum working pressure |
175 psi |
| Pump housing |
Cast iron |
| Connections |
Grundfos GF flanges; port-to-port 6-1/2 to 17-3/4 in by size |
Models & Performance — Will It Do What You Need?
Pick the model whose curve passes through your flow and head. The pump runs anywhere under its top curve, and AUTOADAPT or a set curve holds the duty point.
| Model |
Max head (ft) |
Max flow (GPM) |
At 20% flow |
At 50% flow |
At 75% flow |
| MAGNA1 32-60 GF |
19 |
40 |
8.0 GPM: 19 ft |
20 GPM: 17 ft |
30 GPM: 10 ft |
| MAGNA1 32-100 GF |
32 |
46 |
9.2 GPM: 32 ft |
23 GPM: 24 ft |
34 GPM: 15 ft |
| MAGNA1 40-80 GF |
26 |
86 |
17 GPM: 26 ft |
43 GPM: 20 ft |
64 GPM: 13 ft |
| MAGNA1 40-120 GF |
39 |
102 |
20 GPM: 39 ft |
51 GPM: 28 ft |
76 GPM: 18 ft |
| MAGNA1 40-180 GF |
58 |
108 |
22 GPM: 50 ft |
54 GPM: 33 ft |
81 GPM: 21 ft |
| MAGNA1 50-80 GF |
26 |
117 |
23 GPM: 25 ft |
58 GPM: 17 ft |
87 GPM: 11 ft |
| MAGNA1 50-150 GF |
47 |
157 |
31 GPM: 39 ft |
78 GPM: 27 ft |
117 GPM: 18 ft |
| MAGNA1 65-120 GF |
39 |
204 |
41 GPM: 36 ft |
102 GPM: 24 ft |
153 GPM: 15 ft |
| MAGNA1 65-150 GF |
48 |
246 |
49 GPM: 48 ft |
123 GPM: 36 ft |
184 GPM: 22 ft |
| MAGNA1 80-100 GF |
32 |
244 |
49 GPM: 32 ft |
122 GPM: 28 ft |
183 GPM: 17 ft |
| MAGNA1 100-120 GF |
39 |
301 |
60 GPM: 39 ft |
151 GPM: 34 ft |
226 GPM: 20 ft |
Top-speed (or maximum) curve read from the Grundfos Product Center 60 Hz curve for each model, at 20%, 50% and 75% of that curve’s maximum flow; head in feet of water. The full curve set is the variant image. PSI = feet ÷ 2.31.
Before You Buy — The Limits That Decide the Fit
| Liquid |
Clean, thin, non-aggressive liquids without solids or fibers: water, water-glycol up to 50% |
| Installation |
Horizontal motor shaft; control box not facing down; isolation valves on both sides |
| Inlet pressure |
Keep minimum inlet pressure per the manual to avoid cavitation at high liquid temperature |
| Power |
115-230V 1Ph, 115V 1Ph, 208-230V 1Ph |
Applications
Commercial heating and chilled water loops, ground-source heat pump systems, radiant floors, air handlers and fan coils, and boiler primary/secondary loops.
Materials of Construction
| Pump housing |
Cast iron |
| Impeller |
Composite (PES) |
| Shaft |
Ceramic |
| Rotor can |
Composite |
| Bearings |
Carbon / ceramic |
From the Grundfos MAGNA data booklet.
