Once the temperature and pressure relief valve at the water heater leaks, go check the pressure gauge. If the 'surge indicator' shows something at or near 150 psi, the problem is excessive pressure.

The temperature and pressure relief valve is an extremely important component that helps make sure your water heater operates safely. VIEW E-EDITION. 99¢ for 6 mos. Support local journalism.

This valve allows water or steam to escape from the water heater if the temperature or pressure gets too high. Water heaters come equipped with a temperature and pressure relief valve, also known ...

Question: Our hot-water heater safety-pressure valve runs all the time and drains all the water out of the tank. Test Safety-Pressure Valve for Leaks or Corrosion - Los Angeles Times ...