Caleffi 5R Series Thermostatic Mixing Valve 3/4 inch NPT Inlet x 1/2 inch NPT Outlet, Lead-Free Brass, ASSE 1017

Thermostatic mixing valve delivering precise, safe mixed water temperature control from 95–120°F (35–49°C) for domestic hot water and radiant heating systems. The Caleffi 5R Series valve blends hot and cold water to a set temperature, preventing scalding and ensuring consistent outlet temperature even with pressure or temperature fluctuations. Its low-lead brass body, integrated check valves, and tamper-resistant adjustment make it a reliable safety component for point-of-use or central mixing applications.

Advantages

This valve offers robust safety and performance: ASSE 1017 and CSA B125.3 certified, cUPC listed, and NSF/ANSI 372 compliant for lead-free installations. Integrated check valves on both inlets prevent cross-flow and backflow, while the tamper-resistant cap locks the temperature setting. The low-lead brass construction resists corrosion and ensures long service life, and the compact design fits tight spaces. With a flow rate of 8.5 GPM at 4.35 psi pressure drop, it supports high-demand fixtures without sacrificing temperature stability.

Suitable for

• Domestic hot water distribution systems requiring scald protection
• Radiant floor heating loops needing precise supply temperature
• Point-of-use mixing for sinks, showers, and washbasins
• Commercial and residential applications with ASSE 1017 compliance
• Retrofit or new installations where lead-free valves are mandated

Key specifications

• Valve type: Thermostatic Mixing Valve (TMV)
• Series: Caleffi 5R Series
• Inlet connection: 3/4 inch NPT male
• Outlet connection: 1/2 inch NPT male
• Mixed water temperature range: 95–120°F (35–49°C)
• Max hot water inlet temperature: 200°F (93°C)
• Max cold water inlet temperature: 80°F (27°C)
• Max operating pressure: 200 psi (13.8 bar)
• Body material: Low-lead brass
• Internal components: Polymer, stainless steel
• Certifications: ASSE 1017, CSA B125.3, IAPMO cUPC, NSF/ANSI 372
• Lead-free compliance: Yes
• Flow rate at 4.35 psi drop: 8.5 GPM (32.2 L/min)
• Minimum flow rate: 0.5 GPM (1.9 L/min)
• Integrated check valves: Yes, on hot and cold inlets
• Adjustment mechanism: Tamper-resistant adjustment cap

Recommendations

Ideal for ensuring safe, consistent water temperature in residential and commercial plumbing systems. Pair with a pressure-balancing valve for optimal performance in shower applications.