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Why Your Water Heater Pressure Relief Valve Leaking? Fix It Now

February 29, 2024
Pressure relief valve leaking

Have you ever noticed water leaking from the pressure relief valve on your water heater and wondered why it’s happening? This common issue can be both alarming and stressing for homeowners. The pressure relief valve on the water heater is important for safety. If it starts leaking, it means you should check it or fix it right away to avoid any damage or dangers.

Understanding the Pressure Relief Valve

The pressure relief valve, also called T&P relief valve, lets out water if the temperature or pressure surpasses safety limits. This part is crucial for preventing the water heater from overheating or experiencing excessive pressure. If the water heater gets too hot or has too much pressure, it could potentially explode.

Common Causes of Leaking

High Pressure

When water heats, it expands, increasing the pressure inside the water heater. Installing an expansion tank can help manage this by absorbing the excess pressure, thus preventing leaks.

Faulty Valve

Over time, debris or sediment can cause the valve to malfunction or fail to close properly, leading to a leak. In some cases, simply cleaning or, if necessary, replacing the valve can resolve the issue.

Temperature Fluctuations

If the water heater’s thermostat is set too high or is malfunctioning, causing the water temperature to exceed safe limits (above 120-125 degrees Fahrenheit), the pressure relief valve will open to release the excess pressure. In that case, adjusting your water heater temperature will solve the problem.

Sediment Buildup

Hard water with calcium and magnesium can create limescale in water heaters. This buildup can occur on the inside surfaces of the heater and its parts. This buildup can affect the pressure relief valve. It may cause the valve to get stuck open or not close properly, leading to a continuous leak.

Corrosion Inside the Tank

The inside of a water heater tank is metal, which will corrode over time. Corrosion can weaken the tank and its components, including areas near the pressure relief valve.

How to Fix a Leaking Valve

Test the Valve

Carefully lift the valve’s test lever to see if it closes properly once released. If water continues to leak, it might be time to replace the valve.

Check the Pressure

Attach a pressure gauge to a hose faucet to measure our house water pressure. If readings consistently exceed 80 psi, consider installing a pressure regulator on the cold water pipe entering your home or an expansion tank near the water heater.

Replace the Valve

If the valve is defective or damaged, you might need to replace it. Replacing the pressure valve is normally a easy DIY task but can be done by professionals if needed.

Preventive Measures

To avoid future leaks and ensure the longevity of your water heater, routine maintenance is key. This includes regularly checking the pressure relief valve, monitoring the system’s pressure, and draining the tank annually to remove sediment buildup. Additionally, installing an expansion tank, if not already in place, can significantly reduce the risk of high pressure and subsequent leaks.

Powered Anode Rod

Corrosion and sediment buildup are key culprits behind a leaking valve, but the Corro-Protec powered anode rod offers a robust defense against these issues. This innovative rod halts corrosion and minimizes limescale, ensuring the interior of your water heater remains clean and free from damaging mineral deposits.


By installing a Corro-Protec rod, you tackle the primary reasons for leaks directly, safeguarding the pressure relief valve and enhancing the overall longevity and efficiency of your water heater. The result? A more reliable, durable water heating system with significantly reduced leak concerns.


water heater leaking from relief valve is a sign that should not be ignored. By understanding the causes and taking prompt, appropriate action, you can ensure the safety and efficiency of your water heater. Whether it’s adjusting the temperature, managing the pressure, or replacing a faulty valve, these steps can help maintain your water heater’s performance and prevent potential damage to your home.

Remember, if you’re unsure about tackling this issue yourself, it’s always best to consult with a professional plumber who can diagnose and fix the problem accurately.

Protect your home and ensure the longevity of your water heater by addressing any leaks from the pressure relief valve promptly and effectively.


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