The Grundfos ALPHA CS 15-55 SU7P/TLC is a high-efficiency circulator pump designed for domestic hot water recirculation systems without a dedicated return line. It incorporates a bypass valve with thermal actuator and a built-in digital timer for scheduled operation. The pump features a stainless steel housing, composite impeller, and maintenance-free design with electronic motor protection. FlowSense technology helps regulate flow to reduce pipe wear while maintaining sufficient circulation for tankless water heaters and DHW systems.