Grundfos MAGNA1 Circulator Pumps

Grundfos MAGNA1 Circulator Pumps for Commercial HVAC, Hydronic Heating, Cooling, and Building Water Circulation

Grundfos MAGNA1 Circulator Pumps are high-efficiency variable-speed circulators designed for commercial HVAC, hydronic heating and cooling, and other building-service applications. Combining electronically controlled operation with a wet-rotor circulator design, MAGNA1 pumps provide a straightforward solution for systems where energy efficiency, quiet operation, simple commissioning, and dependable circulation are priorities.

The MAGNA1 is designed for circulating liquids in heating, air-conditioning, and cooling systems. It is particularly useful in variable-flow systems where adjusting the pump duty point to actual system requirements can reduce energy consumption. 

A key advantage of the Grundfos MAGNA1 is its combination of variable-speed performance and simplified control. The circulator provides proportional-pressure, constant-pressure, and constant-curve or constant-speed operating modes, allowing pump performance to be matched to common hydronic system configurations without unnecessary control complexity.

For commercial buildings, MAGNA1 provides an efficient replacement option for older fixed-speed and three-speed circulators. The pump is designed for simple installation, low noise, long service life, and maintenance-free operation. Single-head models are also supplied with insulating shells for heating applications, helping support efficient system operation.

MAGNA1 single-head range with maximum flow up to 313 GPM, maximum head up to 59 feet, maximum system pressure up to 175 PSI, and liquid temperatures from 14°F to 230°F. This broad operating range makes MAGNA1 suitable for many commercial and institutional hydronic circulation applications.

Features

• High-efficiency variable-speed circulator pump design
• Designed for commercial heating, cooling, and HVAC applications
• Wet-rotor circulator construction
• Proportional-pressure control
• Constant-pressure control
• Constant-curve and constant-speed operation
• Designed for variable-flow hydronic systems
• Automatically controlled pump performance based on selected operating mode
• Helps reduce pumping energy consumption compared with traditional fixed-speed circulation
• Simple pump setting and commissioning
• LED indication of selected pump setting
• Low-noise operation
• Maintenance-free design for long service life
• No external motor protection required
• Insulating shells supplied with single-head pumps for heating applications
• Wide operating temperature range
• Maximum flow up to 313 GPM for North American single-head models
• Maximum head up to 59 feet
• Maximum system pressure up to 175 PSI
• Liquid temperature range from 14°F to 230°F
• Suitable for new commercial HVAC installations and circulator replacement projects
• Strong replacement option for older fixed-speed and three-speed circulators

Applications

• Commercial HVAC systems
• Hydronic heating systems
• Hydronic cooling systems
• Chilled water circulation
• Air-conditioning systems
• Boiler water circulation
• Main heating system circulation
• Mixing loops
• Heating surfaces
• Cooling surfaces
• Ground-source heat pump systems
• Solar heating systems
• Variable-flow hydronic systems
• Commercial mechanical rooms
• Institutional buildings
• Schools and universities
• Hospitals and healthcare facilities
• Multi-family residential buildings
• Office buildings
• Older circulator replacement
• Energy-efficiency retrofit projects