Description
The Watts 0559121 is a lead-free, 1-inch thermostatic mixing valve engineered for reliable hot and cold water blending in hydronic and plumbing systems. Designed with unsweated (threaded/union) connections, this valve eliminates the need for soldering during installation, making it an ideal choice for retrofit and new-construction applications alike.
Key Features
- Lead-free construction for compliance with safe drinking water regulations
- 1-inch connection size for straightforward integration into standard piping systems
- Unsweated (non-solder) connections for fast, flame-free installation
- Thermostatic mixing action maintains consistent outlet temperature
- Operating temperature range: 80°F to 120°F
- Protects against scalding by limiting maximum outlet temperature
- Suitable for domestic hot water, radiant heating, and hydronic applications
Product Specifications
- Brand: Watts
- SKU / Part Number: 0559121
- Connection Type: Unsweated (threaded/union)
- Connection Size: 1 inch
- Temperature Range: 80°F – 120°F
- Lead-Free: Yes
Applications
- Domestic hot water tempering and anti-scald protection
- Radiant floor heating systems
- Hydronic heating distribution
- Commercial and residential plumbing installations
The Watts 0559121 thermostatic mixing valve is built to Watts’ exacting quality standards, offering dependable temperature control and long-term durability in demanding HVAC and plumbing environments.









