Caleffi 252159A Thermostatic Mixing Valve

The Caleffi 252159A Thermostatic Mixing Valve is a precise 3-way thermostatic valve designed for solar thermal systems and domestic hot water. This adjustable unit delivers consistent mixed-water temperature, with a nominal 3/4 inch size and soldered x soldered x soldered end connections for straightforward installation.

Built with a brass body and a stainless steel spring, it combines durability with reliable temperature control. The valve covers a set temperature range from 80 to 150°F and tolerates up to 210°F, handling pressures up to 200 PSI. It is lead-free and compliant with common standards for residential and solar heating installations.

• Nominal size: 3/4 inch; End connections: Soldered x Soldered x Soldered
• Adjustable setpoint: 80–150°F for precise hot water control
• Flow rate: 1.3 GPM; Pressure rating: 200 PSI
• Materials: Brass body, stainless steel spring, EPDM seal, PSU shutter
• Applications: Solar thermal systems producing domestic hot water; lead-free and compliant with ASSE 1017, CSA B125.3, NSF/ANSI 372, IPC, IRC, UPC, NPC