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Water Heater Temperature & Pressure Relief Valve Running

  
  
  

water heater tprThe water heater TPR valve (temperature & pressure relief valve) is a critical safety component of your water heater. It helps prevent explosions from excessive pressure and heat inside the tank.

The TPR valve opens when the water temperature exceeds 150-degrees or the pressure exceeds 210 psi to relieve dangerous conditions inside the tank. The valve is piped away from the tank and carries away the hot water and steam.

If the TPR drain is discharging water, people automatically assume that it is broken. That's not always the case. It may be operating correctly and relieving the water heater tank of dangerous termperatures or excessive pressure.

The valve may need replaced, but try a few things first. Go into the house and run some hot water out of a faucet. This will allow hot water to exit the tank and allow cold incoming water to enter the tank. Also, turn the temperature on the thermostat down. The combination of these two items should alleviate the temperature issue.

If you were testing the TPR valve by lifting the tab on it and now it won't shut off, you can try lightly tapping it with a hammer. Sometimes this works and sometimes not.

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