Description
The Grundfos Magna3 40-80 GF (SKU 98126800) is a high-efficiency, electronically commutated motor (ECM) wet-rotor circulator pump engineered for hydronic heating and cooling systems. Operating on 115V single-phase power and rated at 1/3 HP, this cast iron (CI) construction pump delivers reliable, energy-saving performance in a wide range of residential and light commercial hydronic applications.
The Magna3 series represents Grundfos’ flagship line of intelligent circulators, featuring built-in AUTO ADAPT technology that continuously monitors system demand and automatically adjusts pump speed to match — eliminating the need for manual balancing and reducing energy consumption significantly compared to fixed-speed alternatives.
Key Features
- AUTO ADAPT control mode automatically optimizes pump performance to system demand
- Cast iron (CI) construction for durability in hydronic heating and cooling systems
- 115V single-phase power supply for standard North American electrical compatibility
- 1/3 HP (approximately 250W) ECM motor for high efficiency and quiet operation
- Integrated GENIbus communication port for BMS/BAS integration
- Built-in differential pressure sensor — no external sensor required
- Onboard display with intuitive touch interface for easy commissioning and monitoring
- Multiple control modes: Proportional Pressure, Constant Pressure, Constant Curve, and AUTO ADAPT
- Compact, space-saving design suitable for tight mechanical room installations
- Meets or exceeds DOE circulator pump efficiency standards
Typical Applications
- Hydronic heating systems (hot water boilers)
- Chilled water cooling distribution
- Radiant floor heating loops
- Fan coil and air handler circulation
- Domestic hot water recirculation
Why Choose the Grundfos Magna3?
The Magna3 platform is widely recognized in the HVAC industry for its intelligent variable-speed operation, which can reduce circulator energy use by up to 80% versus traditional fixed-speed pumps. The GF flange connection simplifies installation and replacement in existing systems, while the onboard diagnostics and real-time power consumption readout give technicians and building operators full visibility into pump performance.
With its robust cast iron body, flexible control options, and industry-leading ECM efficiency, the Grundfos Magna3 40-80 GF 98126800 is an ideal upgrade or replacement circulator for demanding hydronic system environments.
