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The T and P valve is the temperature and pressure valve that is used on hot water tanks as a safety device. The temperature rating is up to 210 degrees F and a water pressure up to 150 psig. (pound force per square inch gauge) before the safety valve trips to relieve water and lower the pressure inside the tank. When the safety valve trips it allows cooler water to enter the tank to cool off the hot water that tripped the valve in the first place. The valve is usually located on the outflow of the tank as the temperature probe has to be located within 6 inches from the top of the tank where the water temperature will be the hottest. The valve is self resetting as soon as the pressure is reduced or the temperature lowers to below the set point of the valve.

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Q: How do you reset the temperature and pressure valve for electric water heaters?
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