Caleffi 521519A Thermostatic and Pressure Balanced Mixing Valve

The Caleffi 521519A Thermostatic and Pressure Balanced Mixing Valve delivers precise hot-water blending for domestic hot water, radiant heating, and hydronic systems. This 3/4 inch valve features soldered connections and a durable brass body, designed for reliable, long-term performance.

Set temperature ranges from 85 to 150°F, with a temperature rating up to 200°F and a maximum differential pressure of 20 PSI to protect fixtures. The valve is lead-free and meets critical standards for safety and compatibility across plumbing and heating installations.

• Connection: 3/4 inch (Soldered x Soldered x Soldered)
• Thermostatic control with adjustable setpoint (85–150°F)
• Temperature rating up to 200°F; Pressure rating up to 200 PSI
• Flow capacity 3 CV; Flow rate 1 GPM
• Max differential pressure 20 PSI; Max inlet pressure ratio 2:1
• Compact footprint: End-to-end 5", Base to inlet 7-13/16", Inlet to outlet 7-13/16"
• Materials and inclusions: Lead-free brass body; Stainless steel spring, EPDM seal, PPO shutter
• Applications: Domestic hot water, hydronic and radiant heating systems
• Standards: ASSE 1017, CSA B125.3, NSF/ANSI 372, IPC, IRC, UPC, NPC