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Here is an example of the damage caused by a single hot water tank that exploded:
The PT valves on furnaces and boilers are usually checked by the people who clean and adjust them each year. Domestic hot water heaters are usually installed by plumbers who know how to check PT valves if you are unsure of how to do it yourself.
It is also recommended that you check or have checked the water temperature of your hot water heater. It should not be set to more than 180°F. This is because most water heater thermostats cycle above their set point and 180°F is as close to the boiling point of water (212°F) as you ever want to get with any water heater.
Here is a typical PT valve. It can be mounted on the top or side of your water heater. Can you find the PT valve in the photo at the top of this web page? Hint: look for the green circle near the center of the photo. Please, at least once a year have it checked or make sure it is working to avoid a catastrophe.
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