Grundfos MAGNA1 D 50-40F (240) Variable Speed Twin Head Circulator 240V

The Grundfos MAGNA1 D 50-40F (240) is an A-rated, EuP-ready variable-speed twin-head circulator designed for circulating water in heating and domestic hot-water systems. It supports heating systems, mixing loops and heating/air-conditioning applications, and can accept an external hot-water priority signal to run at the maximum curve when required.

• Variable-speed operation with simple selection: three proportional-pressure, three constant-pressure and three fixed-speed curves, indicated by nine light fields.
• Low energy use and A-rated EuP compliance for reduced running cost relative to non‑regulated pumps.
• Maintenance-free design, low noise and long service life.
• Performance and dimensions: 240V 1Ph 50Hz supply, max flow 26 m3/h, max head 4 m, motor power range 21.11–137 W, full load current 0.22–0.65 A.
• Cast-iron construction, 50 mm flanged connections; D50-40 to D50-80 have 240 mm port-to-port and D50-120 to D50-180 have 280 mm port-to-port—spacer kits are available where port-to-port differences require them.

Compact and purpose-built for variable-flow heating and hot-water systems, the MAGNA1 D50-40F balances energy-efficient operation with selectable control curves and cast-iron durability.