The image shows a modern water heater with red pipes and valves connected, installed on a white wall.

When you notice that the water heater pressure relief valve is leaking, it is important to address the problem promptly to prevent potential damage to your home and avoid further complications with your hot water heater.

This blog post will discuss the possible causes of a water heater release valve leaking, what steps you should take to resolve the issue, and how to prevent it from happening again. Continue reading and learn all about it. 

What Is The Pressure Relief Valve?

The pressure relief valve, or T&P valve (temperature and pressure relief valve), is an essential safety feature of your water heater. Its purpose is to release excess pressure that could build up inside the tank due to either high temperature or pressure. 

Without this valve, the tank could potentially explode or suffer severe damage. It is designed to open and release water when the temperature or pressure inside the tank reaches unsafe levels, thus preventing a dangerous buildup.

However, if you notice that the water heater pressure valve leaks at night or at any other time, it may be a sign that something is wrong. The valve could release water in response to high pressure or temperature, or it might malfunction. Either way, it requires attention.

Why Is My Water Heater Leaking From The Pressure Valve? 

The water pressure can be unregulated, the tank might be corroding or maybe your thermostat is overheating. It is important to know how to detect small leaks as a homeowner, but if your water heater is leaking from the relief valve, it could be due to several different issues. Some of the most common causes include:

High Water Pressure 

One of the primary reasons why your water heater is leaking from the pressure valve is excessive water pressure. Municipal water systems can sometimes cause pressure to rise above the safe level for your water heater, triggering the relief valve to open and release water.

Overheating 

If the thermostat on your water heater is set too high, the water temperature inside the tank may exceed safe limits, causing the pressure relief valve to open. Hot water heater pressure relief valve leaking? It is often the case when homeowners unknowingly set the thermostat too high, which leads to an increase in temperature and pressure. 

Faulty Pressure Relief Valve

Sometimes, the valve itself is simply defective or worn out. If the valve has been in use for many years, it might begin to leak even without any pressure or temperature issues. A valve leak can also be caused by mineral buildup or corrosion, which prevents the valve from sealing properly.

Thermal Expansion

When water is heated, it expands. In closed plumbing systems, this can lead to an increase in pressure, causing the relief valve to open and discharge water. If you do not have an expansion tank installed, this could be the reason for the leak.

Water Heater Tank Corrosion

If the interior of your water heater is corroded, it can cause water to escape through the relief valve. In this case, the problem may require a full replacement of the tank, as corrosion can lead to further issues down the line.

Water Heater Leaking From The Pressure Valve: What To Do

First, turn off the power and water supply so you do not hurt yourself. Then, check the valve, temperature and pressure to try and find the reason your water heater is leaking from the relief valve. It is essential to address the issue as soon as possible to prevent any water damage to your home. Here are all the steps you should take:

1. Turn Off The Power 

First, you should turn off the power supply to your water heater. If you have an electric water heater, switch off the breaker. If you have a gas water heater, turn the gas control valve to the "off" position. It will prevent the heater from running, further 
increasing pressure inside the tank.

2. Turn Off The Water Supply 

Next, locate the water supply valve to your water heater and shut it off. It will stop additional water from entering the tank and allow you to deal with the existing leak.

3. Inspect The Valve 

Check the relief valve for visible signs of damage or wear. If the valve is old, corroded, or clogged with mineral deposits, it may need to be replaced. You can try to gently open and close the valve to see if it stops leaking, but if it continues to leak, replacement is likely necessary.

4. Check The Water Pressure

If high water pressure is the culprit, testing the pressure with a water pressure gauge might be a good idea. Water pressure should ideally be between 40 and 60 psi. If the pressure exceeds 80 psi, you may need to install a pressure-reducing valve to prevent future leaks.

5. Check The Temperature

If the water temperature is set too high, reduce it to 120°F to avoid unnecessary pressure buildup. A temperature setting higher than this can cause overheating and force the pressure relief valve to open. 

6. Call A Professional 

When you are unsure about the cause of the leak or you cannot resolve the issue yourself, it is always a good idea to contact a licensed plumber. The cost of water heater repair might be less than repairing all the water damage even a small leak can cause.

Our Wisercosts expert plumbers can inspect the system and determine whether the problem of your water heater pressure relief valve leaking is due to a faulty valve, excessive pressure, or other issues. Call now!