Discontinued - GRUNDFOS - ALPHA2 - CAST IRON ALPHA2 15-55 F/LC w/line cord 115 Variable speed, Flanged, 6ft line cord - 99163906

The Grundfos ALPHA2 15-55 F/LC (MPN 99163906) is a high-efficiency ECM variable speed circulator designed for residential and light-commercial closed-loop hydronic heating systems. Its AUTOADAPT function analyzes changing heating demand and automatically adjusts pump output to provide efficient circulation with minimal power consumption. The cast iron housing, integrated check valve, magnetite-resistant hydraulic design, and maintenance-free wet rotor construction support quiet, dependable operation. A front LED display shows estimated flow and current watt consumption, while the factory-installed 6 ft power cord simplifies electrical connection. Typical applications include boilers, radiant floor heating, baseboard systems, panel radiators, fan coils, and geothermal loops.

Cross References

• Grundfos — 99163906: ALPHA2 15-55 F/LC cast iron model with line cord
• Grundfos — 59896832: Earlier ALPHA 15-55 F/LC model replaced by 99163906
• Grundfos — 99285998: Listed by PexUniverse as the direct replacement for discontinued 99163906; verify flange, electrical, and control compatibility before substitution.

Usage

The Grundfos ALPHA2 15-55 F/LC circulates water through closed-loop hydronic heating and cooling systems. It is commonly installed on residential boilers, radiant floor heating manifolds, hydronic baseboards, panel radiators, fan coil units, geothermal systems, and primary-secondary piping loops. The installer can leave the pump in AUTOADAPT mode or choose one of three constant-pressure or three constant-speed settings to match system requirements. Because the housing is cast iron, this model is intended for closed-loop systems and not potable domestic water circulation. The supplied line cord allows plug-in installation where permitted by local electrical codes.