Caleffi 521500A Thermostatic and Pressure Balanced Mixing Valve

The Caleffi 521500A Thermostatic and Pressure Balanced Mixing Valve delivers precise, safe temperature control for domestic hot water, hydronic and radiant heating systems. The Caleffi 521500A Thermostatic and Pressure Balanced Mixing Valve combines durable brass construction with accurate mixing to stabilize outlet temperatures across varying supply conditions.

Designed for a 3/4" nominal size with end connections as three male threaded ends, it fits standard piping while delivering reliable performance. Key specs include a set temperature range of 85 to 150 Deg F (temperature rating up to 200 Deg F), a 200 PSI pressure rating, and a 1 GPM flow capacity. The unit also supports a maximum differential pressure of 20 PSI and a 2:1 inlet-to-outlet pressure ratio for safe operation in hot water and radiant systems.

• Thermostatic & pressure balanced: maintains stable outlet temperature despite supply fluctuations.
• Compact, three male threaded inlets/outlets: 3/4" nominal size with end connections for easy installation.
• Durable materials: brass body, stainless steel spring, EPDM seal, PPO shutter; lead-free.
• Performance: 1 GPM flow, 20 PSI max differential, 200 PSI maximum inlet pressure.
• Standards & applications: ASSE 1017, CSA B125.3, NSF/ANSI 372, IPC, IRC, UPC, NPC; ideal for domestic hot water, hydronic, and radiant heating systems.

Choose the Caleffi 521500A for reliable temperature control, long service life, and compliant performance in modern plumbing installations.