Watts 0556003 L100XL-3-150 3/4″ T&P Relief Valve 100,000 BTU

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.