What to Do if a Water Heater’s Relief Valve Is Leaking or Dripping

If you’ve noticed water dripping from a water heater’s relief valve, it’s not something to ignore. This valve—technically known as the Temperature and Pressure (T&P) Relief Valve—is a critical safety feature that prevents water heaters from becoming a hazard.

This article will explain what the T&P valve does, why it might be leaking, and what steps you should take to keep the water heater running safely and efficiently.

What Is a Water Heater T&P Relief Valve?

The T&P relief valve is designed to automatically release water if the temperature or pressure inside the tank exceeds safe levels. This helps prevent potential damage or even a catastrophic failure, such as a burst tank. The relief valve is typically located on the side or top of the tank, with a discharge pipe running downward.

A water heater leaking from the relief valve could mean your system is under stress—and that can become dangerous if not addressed quickly.

Never Cap or Remove a Leaking Relief Valve

If a water heater’s relief valve is leaking, do not cap it or attempt to remove it. This safety device is the only thing preventing dangerous pressure buildup. Capping the relief valve to stop a leak can lead to serious consequences, including water heater explosion due to pressure overload.

Identify Why the Relief Valve Is Leaking

There are a few common reasons why a water heater’s relief valve might be leaking:

• Excessive water pressure: High incoming water pressure can force the valve to open.
• Water temperature is too high: A thermostat malfunction can cause overheating, which increases tank pressure.
• Sediment buildup: Hard water minerals can clog or corrode the valve, preventing it from sealing properly.
• Faulty valve: Over time, the valve itself can wear out and leak even under normal conditions.

Call a Professional to Inspect Your Water Heater

A leaking T&P valve is not something to troubleshoot on your own. Always call a licensed plumber to evaluate the water heater. A professional can check pressure settings, test the valve, and ensure that your tank is operating safely.

Early intervention can prevent extensive water damage or more costly repairs down the road.

Replace a Faulty Water Heater Relief Valve Promptly

If your plumber finds that the valve itself is defective, replacing it is a quick and inexpensive repair that can restore the system’s safety. A relief valve replacement is essential if you want to prevent future leaks or system failures.

Conclusion: Don’t Ignore a Leaking T&P Valve

When a water heater is leaking from the relief valve, it’s often a sign of pressure or temperature issues—or a failing safety component. Never attempt a DIY fix by capping the valve. Instead, contact a plumbing professional immediately to diagnose and fix the issue.

Maintaining a properly functioning water heater relief valve is crucial for the safety and efficiency of your home’s hot water system. If you spot a leak, take action—your safety depends on it.