Description
Watts LF140S-3 Lead Free Automatic Reseating Temperature & Pressure Relief Valve
The Watts F121449 LF140S-3 is a 3/4″ lead-free, automatic reseating temperature and pressure relief valve engineered for reliable overpressure and overtemperature protection in water heating systems. Designed to meet the demands of commercial and residential hydronic and water heating applications, this valve delivers dependable safety performance with the added convenience of automatic reseating — eliminating the need for manual reset after a relief event.
Key Features
- 3/4″ connection size for standard water heater and hydronic system installations
- Lead-free construction compliant with low-lead potable water requirements
- Automatic reseating design resets without manual intervention after actuation
- Maximum pressure rating: 150 psi
- Maximum temperature rating: 210°F
- 3″ coated thermostat element for accurate temperature sensing
- Discharge line flood sensor included for leak detection and system monitoring
Lead-Free & Code Compliant
The LF140S-3 is built with lead-free materials, making it suitable for potable water systems where low-lead compliance is required. Its construction supports adherence to applicable plumbing codes and standards for safe drinking water installations.
Discharge Line Flood Sensor
This valve ships with a discharge line flood sensor included, providing an added layer of protection by alerting users to discharge events or moisture at the relief valve outlet — an essential feature for minimizing water damage and ensuring system accountability.
Specifications
- SKU: F121449
- Model: LF140S-3
- Brand: Watts
- Connection Size: 3/4″
- Maximum Pressure: 150 psi
- Maximum Temperature: 210°F
- Thermostat Length: 3″ Coated
- Construction: Lead-Free
- Valve Type: Automatic Reseating Temperature & Pressure Relief
- Includes: Discharge Line Flood Sensor
Ideal Applications
- Residential and light commercial water heaters
- Hydronic heating systems
- Potable water systems requiring lead-free components
- Boiler and storage tank overpressure/overtemperature protection
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