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Before you begin, make sure you know where the shut-off valve of your tank is. It's usually located on the cold water feed, on the right side inlet on top of the tank.

Because the T&P valve is rarely used, mineral build-up can cause it to stiffen over time. This is a significant safety hazard because, in the event of a temperature or pressure spike, the T&P valve may not open as it should and the water heater might explode.

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In a standard water heater, the water is heated by a gas burner or electric elements. As the water reaches temperatures between 120 and 140 degrees Fahrenheit, both the water and the water heater's metal tank expand.

Briefly pull back on the T&P valve's metal lever to cause a small amount of water (about 1/4 cup) to discharge into the bucket.

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T&P valves can also become stuck either in a downward (closed) or fully extended (open) position. Either condition is a potentially serious problem.

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Water heater manufacturers recommend that you regularly check the T&P valve. Wear closed-toe shoes to avoid scalding. Except for a bucket, no tools are required.

As helpful as it is, the T&P valve might be thought of as having more uses than it actually does. Here are some things that the T&P valve does not do.

A water heater that periodically discharges hot water and steam from the T&P valve may be set to a water temperature that is too high. Make sure that the water temperature setting is in the normal recommended range—about 120 degrees Fahrenheit—or no more than about 150 degrees Fahrenheit.

The stickiness of the valve can sometimes be remedied by simply opening and closing the lever several times. Jiggle the T&P valve by gently pulling the lever towards you. Much like jiggling a toilet handle, this action may be enough to unstick the valve. If this does not fix the problem, replace the valve.

Mandated by all plumbing codes, the T&P valve relieves excess temperature and pressure in a water heater if either reaches a critical point. A water heater is a closed system, and thermal expansion is an inescapable fact of both normal and abnormal water heater functioning.

If all goes well, a TPR valve never gets used intentionally except during testing. But in the event of an emergency or malfunction, this valve is of critical importance. It can potentially prevent your water heater from exploding. Understanding how a T&P valve works will help you keep your water heater in tip-top shape and prevent possible damage to your home.

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If the valve is leaking due to dirt or sediment trapped in the relief port, pull the metal spring lever back again and discharge water into the bucket. Once the lever snaps back again, if the water fails to stop completely, shut turn the gas valve to the off position and shut the water off to replace the valve.

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However, some caution is necessary whenever working with a water heater, because the T&P valve can become damaged if the water heater has exceeded maximum pressure or temperature levels. If you suspect a pressure-related problem with your water heater tank, hire a licensed plumber to have the water heater inspected.

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In most cases, there are two problems you might have to address with the T&P valve: a valve that leaks by constantly dripping or a valve that sticks and doesn't open and close properly.

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On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward. The valve is called a T&P valve, or TPR valve, for "temperature and pressure relief."

When you purchase a water heater, the T&P valve generally comes pre-installed. A threaded inlet is welded onto the side of the tank. This inlet cannot be removed or replaced. The T&P valve is screwed clockwise onto that inlet.

A T&P valve is a valve with an attached tube located on the outside of a water heater. The valve provides relief to the water heater if the pressure exceeds normal operating limits, usually 150 psi.

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Place a water heater pan below the water heater to collect slow drips or to catch minor emergency outflows of water. This is done when the water heater is installed.

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Installing or replacing the discharge tube is easy, fast, and there is no need to power down or drain the water heater. Most homeowners can do this by themselves.

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Follow by tightening the tube fully with a wrench. Be careful not to strip or break off the T&P valve or discharge tube by tightening it too much.

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In most cases, the T&P valve will last as long as the water heater itself, and fixes are easy if you perform annual testing to catch problems early.

When a T&P valve is leaking, it may be due to the valve not being properly seated in the threaded opening of the tank. This is especially likely if the leaking occurs immediately after an old valve is replaced. This can be remedied by shutting off the water heater and letting it cool down completely, then removing and rethreading the valve into the tank's opening.

While those items are already in place, the discharge tube running downward along the side of the tank is not pre-installed.

Some expansion is normal, but too much expansion is unsafe. When the temperature reaches 210 degrees or the pressure reaches 150 psi (pounds per square inch), a properly functioning T&P valve opens and expels hot water and steam through the discharge tube.

Release the lever and let it snap back to its original position. If the lever does not snap back into place, the valve is faulty and must be replaced.

When stuck downward, the valve cannot provide relief if the system reaches maximum pressure. As a result, the water heater tank might rupture. When stuck in a fully extended position, the T&P valve will continually leak water down through the discharge tube, potentially flooding the home.