Watts W-0121415 Tp Relief Valve 150 Psi 210F 3/4 Inch

Product Description

The WATTS W-0121415 is a temperature and pressure relief valve designed to provide automatic overpressure and overtemperature protection in water heating and hydronic systems. When system pressure exceeds 150 PSI or water temperature climbs above 210 degrees F, the valve opens to discharge safely, preventing dangerous pressure buildup. The 3/4 inch connection size suits standard residential and light commercial installations. Licensed plumbers and HVAC technicians install this valve as a code-required safety device on water heaters, boilers, and closed-loop hydronic systems. It is a direct-function safety component, not a control device.

This valve is suited for residential and light commercial applications including domestic hot water heaters, steam or hot water boilers, and hydronic heating systems. The 150 PSI pressure rating and 210 degrees F temperature setting align with standard water heater safety requirements under ASME and ANSI codes. It is typically installed at the designated T and P port on the appliance, with a discharge line routed per local plumbing code to a safe drain point.

Key Features

• Automatic relief at 150 PSI or 210 degrees F to prevent dangerous overpressure and overtemperature conditions
• 3/4 inch connection size for standard residential and light commercial system compatibility
• Combined temperature and pressure relief in a single valve body simplifies installation
• Designed for water heaters, boilers, and hydronic heating system applications
• Complies with ASME and ANSI safety standards typical for T and P relief valves

Compatibility

Designed as an OEM-style replacement or new-installation T and P relief valve for residential and light commercial water heaters and boilers equipped with a 3/4 inch relief port rated for 150 PSI and 210 degrees F service.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and ASME guidelines. Shut off the water supply and allow the system to depressurize and cool fully before removing or installing any relief valve. A discharge pipe must be connected to the valve outlet and terminated at a safe, visible drain point per IPC and local code requirements. Do not cap, plug, or restrict the discharge outlet at any time.