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Grundfos 99163903 ALPHA2 15-55F High-Efficiency Circulator Pump

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Price: $275.95
Item Number: 99163903
Manufacturer Name: Grundfos
Manufacturer Part No: ALPHA2 1555F

Brochures & Secification Sheets 

Suitable for
  • HVAC: Heating
  • Plumbing: Hot Water Recirculation
  • Residential hot water recirculation
  • Residential heating
  • District heating
  • Industrial heating

ALPHA2 15-55 is a high-efficiency ECM variable speed circulator designed for a variety of heating and hot-water recirculation applications. The pump features AUTOADAPT and constant-pressure control modes.

The Grundfos ALPHA2 is a 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 constant curve with each three settings. The factory default setting is AUTOADAPT which continuously adjusts the pump performance to the actual heat demand, i.e. the size of the system and the changing heat demand 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 intuitive one-button operation and LED display makes the selection of the settings easy. The large LED display shows the current energy consumption in Watts and estimated flow in gallons per minute.

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

The robust startup enables ALPHA2 to continuously attempt to restart – indefinitely – in blocked rotor conditions.

ALPHA2 is complete with an integrated check-valve, and nut captures for flanges.

For power connection two options are available with either line cord or terminal box for conduit connections.


Product name ALPHA2 15-55F
Product No. 99163903
EAN 5712607918224


Head max 18.05 ft
TF class 110
Approvals on nameplate ETL, FCC


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


Range of ambient temperature 32 .. 104 °F
Maximum operating pressure 145.04 psi
Type of connection GF
Pressure stage PN 10
Port-to-port length 6 1/2 in


Pumped liquid Water
Liquid temperature range 35.6 .. 230 °F
Selected liquid temperature 140 °F
Density 61.35 lb/ft³

Electrical data

Power input - P1 5 .. 45 W
Main frequency 60 Hz
Rated voltage 1 x 115 V
Maximum current consumption 0.1 .. 0.65 A
Enclosure class (IEC 34-5) IP42
Insulation class (IEC 85) F
Built-in motor protection NONE
Thermal protec ELEC


Pos term box 6H


Net weight 7.06 lb
Gross weight 7.37 lb
Shipping volume 0.28 ft³
Sales region USA

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