Item # 9W79EFUPC: 098268432350


Series LF100XL Temperature and Pressure Relief Valves are used in water heater and hot water storage tank applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU/hr.

They feature a Lead Free* copper alloy body with NPT male inlet and NPT female outlet connections, unique thermostat with special thermo-bonded coating, and a test lever.

Series LF100XL furnished with test lever and extension thermostat for installation in the hot water outlet line or directly in the tank tapping. Temperature sensing element must be immersed in the water within the top 6" (152mm) of the tank.

  • Series LF100XL Size 3/4" (20mm)
  • ASME Rated, CSA Listed
  • Features a unique thermostat with special thermo-bonded coating
  • Lead Free* copper alloy body
  • Stainless steel spring
  • Thermostat is accurate and proven. Exclusively designed and manufactured by Watts
  • Fully opens before 210 degrees
  • Meets lead free requirements
  • 3/4" NPT male inlet - female outlet
  • Provides the least expensive & proven means for protection against excessive temperature and pressure emergency conditions
  • Temperature relief 210°F (99°C)
  • Standard settings 75, 100, 125, 150 psi
  • *The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.


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  • ⚠ CALIFORNIA: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to