Grundfos 99490916 ALPHA2 26-99F Cast Iron Variable Speed Circulator Pump

Sale price$646.99

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Grundfos 99490916 ALPHA2 26-99F Cast Iron Variable Speed Circulator Pump

Grundfos 99490916 ALPHA2 26-99F Cast Iron Variable Speed Circulator Pump


  • The Grundfos ALPHA2 is a medium sized high-efficiency, variable speed circulator fitted with electronically commutated motor. Designed for circulating liquids in heating systems.

    It features a constant pressure control mode and a proportional pressure control mode each with three settings, and constant pressure and proportional pressure AUTOADAPT. The constant and proportional pressure AUTOADAPT mode enables the pump to continuously adjust the pump performance to the actual heat demand, i.e. the size of the system and the changing heat demands during the year. The function will find the setting that provides optimal comfort with minimal energy consumption. It contributes to fast, safe and easy commissioning.

    The one-button operation and LED display makes the selection of the settings easy.

    ALPHA2 materials and design are resistant to blockage from magnetite found in hydronic systems.

    ALPHA2 is complete with an integrated check-valve.

    It is fitted with a terminal box for conduit connections.



Head max 32.48 ft
TF class 110
Approvals on nameplate UL


Pump housing Cast iron
EN 1561 EN-GJL-150
Impeller Composite


Range of ambient temperature 32 .. 131 °F
Maximum operating pressure 145.04 psi
Type of connection GF
Pipe connection 1 1/4
Pressure stage PN 10
Port-to-port length 6 1/2 in


Pumped liquid Water
Liquid temperature range 14 .. 203 °F
Selected liquid temperature 140 °F
Density 61.35 lb/ft³

Electrical Data

Power input - P1 3 .. 120 W
Main frequency 60 Hz
Rated voltage 1 x 115 V
Maximum current consumption 0.05 .. 1.7 A
Enclosure class (IEC 34-5) IP42
Insulation class (IEC 85) F
Motor protection NONE
Thermal protec ELEC


Pos term box




Net weight 7.71 lb
Gross weight 8.47 lb
Shipping volume 271 ft³
Sales region USA
Country of origin US
Custom tariff no. 8413.70.00.21

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