Also known as a temperature and relief valve, this is put on water heaters to keep them from becoming dangerous by releasing pressure if the unit should overheat or overpressurize. Over time, they can become faulty, which not only causes a potential danger from not performing if needed, but can also stick open if you try to test them out when they are older. If you see hot water coming out of the pipe at the side of your home, this is the culprit. Call a licensed plumber, like AugerPros Plumbing, 214-206-6580.
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