Description
The Watts 0559109 ThermoMix Thermostatic Mixing Valve (Model L1170-US) is a precision-engineered 3/4″ mixing valve designed to deliver consistent, tempered water at a safe and comfortable outlet temperature. By automatically blending hot and cold water supplies, this valve provides reliable scald protection and freeze-prevention in a wide range of residential and light commercial hydronic and plumbing applications.
Key Features
- 3/4″ connection size for straightforward integration into standard piping systems
- Adjustable outlet temperature range of 60°F to 120°F to suit diverse application requirements
- Thermostatic mixing element automatically compensates for fluctuations in supply pressure and temperature
- Compact, durable construction engineered for long-term, low-maintenance service
- Model L1170-US designed and rated for the North American market
- Helps meet plumbing codes and standards for tempered water delivery at fixtures
Typical Applications
- Domestic hot water tempering at point-of-use or point-of-distribution
- Hydronic heating systems requiring precise mixed-water temperature control
- Commercial and residential lavatory, shower, and fixture protection
- Boiler feed and radiant heating circuits requiring tempered supply water
Product Specifications
- Brand: Watts
- SKU / Part Number: 0559109
- Model: L1170-US
- Series: ThermoMix
- Connection Size: 3/4″
- Outlet Temperature Range: 60°F – 120°F
- Market: North America (US)
Trust Watts’ proven ThermoMix technology to protect occupants from scalding while ensuring optimal comfort and system efficiency. Order the Watts 0559109 from Jackson Systems today.









