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- The ALPHA1 is an energy efficient, variable speed circulator built with reliable, electronically controlled Grundfos permanent magnet motor (ECM) technology. Featuring three-constant pressure control modes, an LED display and easy-to-use push button controls, the ALPHA1 is the perfect solution for domestic hydronic heating and hot water recirculation applications.
Grundfos Variable-Speed Circulator, High-Efficiency, Series: Alpha 1, 21 gpm, 15 mm Inlet, 15 mm Outlet, 5 to 45 W, 115 VAC, 0.1 to 0.65 A, 60 Hz, 1 ph, 145.04 psi Maximum, Composite Impeller, Surface Mount, 32 to 104 deg F Ambient, IP42, 3.82 in W x 6.38 in D x 6.5 in H
- ALPHA1 can replace more than 30 other pump models
- ALPHA1 features the highest torque rating and most powerful start feature in its class which attempts to restart indefinitely every seven seconds in blocked rotor conditions
- Designed with trusted Grundfos ECM (permanent magnet motor) technology which has been used by Grundfos for more than 15 years
- ALPHA1 features three-constant pressure control modes with easy to use push button settings
- Large LED display shows energy watt consumption and flow indicator in gals per minute
- ALPHA1 is compatible with either a line cord or terminal box for conduit connections
- Extremely quiet 19.2 dB(A) operation - Tested in one of the best European sound labs
- ALPHA1 features an integrated check-valve and nut captures for flanges
- Magnetite resistant design with a stainless-steel bearing plate, robust ceramic shaft and ceramic bearing rings
- Cast iron rotated flange with terminal box
- Flow Rate21 gpmInlet Size15 mmOutlet Size15 mmVoltage Rating115 VAmperage Rating0.1 to 0.65 ADimensions6.5 in H x 6.38 in D x 3.82 in WEnclosure TypeIP42Frequency Rating60 HzImpeller TypeCompositeManufacturerGrundfosManufacturer #99287259Maximum Pressure145 psiMotor HP1/16 HPMounting TypeSurfacePhase1Power Rating5 to 45 WSeriesAlpha 1Temperature Rating32 to 104 degF Ambient