GRUNDFOS - ALPHA2 - STAINLESS STEEL (without temp sensor)-Hot Water Recirculation 115 Variable speed, 5-45W, 0.65A, flanged - 99163937

The Grundfos ALPHA2 15-55SF (MPN 99163937) is a premium high-efficiency ECM variable speed circulator pump designed for domestic hot water recirculation and hydronic heating systems. Featuring a corrosion-resistant stainless steel pump housing, AUTOADAPT technology, and an electronically commutated motor (ECM), this circulator continuously adjusts its performance to match system demand while minimizing energy consumption. Operating on 115V with a power range of only 5–45 watts, the ALPHA2 delivers reliable, quiet operation and exceptional efficiency. Its integrated LED display provides real-time power consumption and estimated flow rate, making it an ideal solution for residential, commercial, and institutional hot water circulation systems.

Cross References

• Grundfos — 99163937
• Grundfos — ALPHA2 15-55SF
• Grundfos — 59896879 (Previous ALPHA 15-55SF model replaced by 99163937)

Usage

The Grundfos ALPHA2 15-55SF is designed for domestic hot water recirculation and closed-loop hydronic heating systems where a stainless steel pump body is required. It is commonly installed on domestic hot water return lines, radiant floor heating systems, boilers, fan coil units, heat pumps, and commercial HVAC systems. AUTOADAPT technology continuously monitors system demand and automatically adjusts pump speed to deliver optimal comfort while reducing electrical consumption. The maintenance-free wet rotor design eliminates mechanical seals and provides quiet, dependable operation with minimal servicing requirements.