Caleffi 521619A Thermostatic and Pressure Balanced Mixing Valve

Caleffi 521619A thermostatic and pressure balanced mixing valve delivers precise temperature control for domestic hot water, hydronic, and radiant heating systems. This 3-way, adjustable valve blends hot and cold water with a dependable thermostatic element to maintain a stable outlet temperature as supply conditions vary. The brass body is 1 inch nominal, with end connections soldered x soldered x soldered, and the unit fits in a compact footprint with end-to-end distance of 6-1/8 inch and base-to-inlet and inlet-to-mixing-outlet distances of 7-13/16 inch. Rated for up to 200°F and 200 PSI, it handles demanding residential and light commercial applications while supporting a maximum differential pressure of 20 PSI and a 2:1 inlet ratio.

• Thermostatic, pressure‑balanced 3‑way design for consistent comfort and safe domestic hot water
• 1" nominal size with end connections soldered x soldered x soldered
• Set temperature 85–150°F; temperature rating to 200°F; max pressure 200 PSI
• Flow capacity 1 GPM (3 CV) for reliable distribution
• Lead-free brass body with stainless steel spring, EPDM seal, PPO shutter; compliant with ASSE 1017, CSA B125.3, NSF/ANSI 372