GRUNDFOS - ALPHA2 - CAST IRON ALPHA2 15-55 F w/terminal box 115 Variable speed, Flanged, Terminal Box - 99163903

The Grundfos ALPHA2 15-55 F (99163903) is a premium high-efficiency ECM variable speed circulator pump designed for residential and light commercial closed-loop hydronic heating and cooling systems. Featuring a durable cast iron housing, integrated terminal box, AUTOADAPT technology, and multiple constant-pressure and constant-speed operating modes, this circulator automatically adjusts performance to match system demand while minimizing energy consumption. The maintenance-free wet rotor design, built-in LED display, integrated check valve, and magnetite-resistant construction provide quiet, reliable operation for radiant floor heating, panel radiators, boilers, geothermal systems, fan coil units, and primary/secondary hydronic loops.

Cross References

• Grundfos — 99163903
• Grundfos — ALPHA2 15-55 F
• Grundfos — ALPHA2 15-55F 1×115V Terminal Box

Usage

The Grundfos ALPHA2 15-55 F is designed to circulate heated or chilled water through closed-loop hydronic systems. It is commonly installed in residential boilers, radiant floor heating, fan coil systems, geothermal heat pumps, baseboard heating, and primary/secondary piping arrangements. Its AUTOADAPT control continuously monitors system demand and automatically adjusts pump speed for maximum comfort and minimum electrical consumption. The terminal box configuration is ideal for hard-wired installations where conduit connections are preferred instead of a factory power cord.