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What causes a pressure relief valve to leak?

The pressure relief valve in a Water Heater is designed to release water from the tank if the pressure in the tank reaches more than 150 psi, or the temperature reaches more than 210 degrees. But a leaking valve can also mean the valve seal is faulty. If you find the pressure relief valve is draining or leaking frequently, then it’s best to have your tech check your water heater as this means something is causing unsafe temperature / pressure levels in the unit.

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