Caleffi 521516AC

The Caleffi 521516AC is a 3/4" press 3-way mixing valve with gauge and inlet checks, designed for precise hot water mixing. With a Cv of 3 and a temperature range of 85–150°F, it delivers reliable control for radiant floor heating and domestic hot water systems.

Engineered for easy installation and dependable performance, this valve blends hot and cold supplies to achieve a steady outlet temperature while helping protect pumps and fixtures from sudden temperature shifts. A built-in gauge provides quick, at-a-glance monitoring, and the inlet checks prevent backflow for safer operation.

• 3/4" press connections for quick, secure installation
• 3-way mixing design enables precise temperature control
• Integrated gauge for easy temperature readouts
• Inlet check valves prevent backflow and cross-contamination
• Temperature range 85–150°F (29–66°C)
• Cv = 3 for balanced flow and performance

Ideal for residential and light commercial hydronic setups, the Caleffi 521516AC optimizes comfort and efficiency without complicating maintenance.