Description
The Watts 0556003 L100XL-3-150 is a 3/4-inch Temperature and Pressure (T&P) Relief Valve engineered to deliver dependable overpressure and overtemperature protection for residential and light commercial water heaters and storage tanks. Part of Watts’ trusted L100XL lead-free series, this valve is designed to open automatically and discharge water when system temperature or pressure exceeds safe operating limits — safeguarding equipment, property, and occupants.
Key Features
- 3/4-inch NPT inlet connection for straightforward installation on standard water heater ports
- 100,000 BTU/hr rated capacity to match a wide range of residential and light commercial water heater outputs
- 150 PSI pressure relief setting provides a robust safety margin for high-demand systems
- Lead-free construction meets NSF/ANSI 61 and NSF/ANSI 372 requirements for potable water safety
- ASME- and CSA-listed for code compliance across North American jurisdictions
- Automatic reset design — valve reseats after pressure or temperature normalizes
- Durable brass body construction for long-term corrosion resistance
- Test lever included for periodic field verification of valve operation
Specifications
- Brand: Watts
- Model: L100XL-3-150
- SKU: 0556003
- Connection Size: 3/4″ NPT
- BTU Rating: 100,000 BTU/hr
- Pressure Setting: 150 PSI
- Body Material: Lead-free brass
- Series: L100XL (Lead-Free)
Applications
- Residential water heaters
- Light commercial hot water storage tanks
- Hydronic heating system storage vessels
- Any pressurized water heating application requiring ASME-listed T&P protection
The Watts L100XL series is a go-to choice for plumbing and HVAC professionals who need a reliable, code-compliant T&P relief valve. Its lead-free brass construction and ASME listing make it suitable for potable water systems, while the 150 PSI/100,000 BTU ratings cover the majority of residential water heater installations. Order the Watts 0556003 from Jackson Systems for fast fulfillment and expert support.
