Description
Watts F163805 1″ LL40XL Thermostatic Mixing Valve Overview
The Watts F163805 is a 1-inch LL40XL series thermostatic mixing valve engineered for domestic hot water systems where both Legionella bacteria control and scald protection are critical priorities. Designed to operate across a 150/210°F temperature range, this valve allows hot water to be stored and distributed at high temperatures — effectively inhibiting Legionella growth — while blending down to a safe, user-friendly delivery temperature at the point of use.
Key Features
- 1-inch connection size for compatibility with a wide range of residential and light commercial plumbing systems
- LL40XL (Legionella-Limiting) design supports high-temperature storage and distribution to suppress Legionella bacteria
- 150/210°F operating temperature range accommodates high-temperature hot water supply while delivering safe mixed outlet temperatures
- FS (Female Sweat) end connections for secure, leak-resistant installation
- Thermostatic mixing element automatically compensates for fluctuations in supply temperature and pressure
- Durable construction built to Watts’ exacting quality standards for long-term reliability in demanding hydronic and plumbing applications
Applications
- Domestic hot water systems requiring Legionella risk management
- Hospitals, care facilities, hotels, and multi-family residential buildings
- Point-of-use and point-of-distribution hot water tempering
- Systems requiring compliance with ASSE 1017 or similar thermostatic mixing valve standards
Product Specifications
- Brand: Watts
- SKU / Part Number: F163805
- Model Series: LL40XL
- Connection Size: 1 inch
- Connection Type: Female Sweat (FS)
- Temperature Range: 150°F / 210°F
- Valve Type: Thermostatic Mixing Valve
Why Choose the Watts LL40XL?
Watts is a globally recognized leader in flow control and water quality solutions. The LL40XL series reflects their commitment to combining safety, performance, and compliance in a single, easy-to-install package. Whether you are retrofitting an existing system or specifying for new construction, the F163805 delivers the reliability and temperature precision that professionals demand.
