If your hot water heater’s pressure relief valve is opening, it’s important to take action to find out why.
A valve that keeps opening can be a sign of a serious problem with your water heater.
Why Does Hot Water Heater Pressure Relief Valve Keep Opening?
There are many reasons your pressure relief valve may be opening.
1. The Water In Your Tank Is Too Hot
This is the most common reason for a pressure relief valve to open.
If the temperature inside your tank exceeds 210 degrees Fahrenheit, the valve will open to release some of the pressure and prevent the tank from exploding.
2. The Pressure In Your Tank Is Too High
If the pressure in your tank gets too high, it can also cause the pressure relief valve to open.
This can happen if there’s a blockage in your water heater’s discharge pipe, or if the temperature/pressure relief valve itself is defective.
3. Your Earthquake Straps Are Loose Or Broken
In areas susceptible to earthquakes, it’s important to have earthquake straps installed on your water heater.
These straps help keep the tank from toppling over if an earthquake hits. If they’re loose or broken, the tank can move and cause the pressure relief valve to open.
4. There’s A Leak In The Tank
If there’s a leak in your water heater tank, it can also cause the pressure relief valve to open.
This is because the water leaking out of the tank will reduce the pressure inside, causing the valve to open and release some of the pressure.
5. The Temperature/Pressure Relief Valve Itself Is Defective
It’s possible that the temperature/pressure relief valve itself is defective and needs to be replaced.
If this is the case, you’ll need to have a professional plumber replace the valve for you.
How To Fix Hot Water Heater Pressure Relief Valve
When your pressure relief valve is constantly opening, there are a few things you can try to fix the problem. Follow the below step to troubleshoot and repair your valve.
Step 1: Check The Temperature
First, check the temperature of the water in the tank. When the water is too hot, it can cause the pressure to build up and trigger the relief valve.
Try adjusting the thermostat to a lower setting.
When the water temperature is not the problem, then there may be too much pressure in the tank.
Also, check for any leaks in the tank that could be causing the water to overheat.
Step 2: Check The Pressure
When the water temperature is not the problem, there may be too much pressure in the tank.
This can be caused by a number of things, including a leak in the tank or a buildup of sediments.
Look for any water around the tank’s base to check for a leak. Also, to check for a buildup of sediments, open the drain valve and let some water out of the tank.
If sediments are the problem, they will likely come out with the water.
Step 2: Check The Pressure Gauge
Next, check the pressure gauge. When the needle is in the red zone or above the safe range, then the pressure inside the tank is too high.
This can also cause the relief valve to open.
To fix this, you will need to reduce the pressure in the tank. This can be done by bleeding off some of the water through the valve.
Step 3: Check The Relief Valve
Finally, check the relief valve itself. If it is dirty or corroded, it may not be opening and closing correctly.
Try cleaning the valve with a brush to remove any debris that may be causing it to stick open.
When you have tried all the above steps, and the pressure relief valve is still opening, it is likely time for a replacement.
Be sure to get a new valve that is the same size and model as your old one.
Once you have replaced the valve, be sure to recheck all of the above steps to ensure that there is no other problem causing the pressure to build up in the tank.
How Do You Know If Your Pressure Relief Valve Is Bad?
When a pressure relief valve on a hot water heater fails, there are a few things to examine. The first thing to look for is any noise.
When you hear a rattling or squeaking noise from your valve. It’s likely that it isn’t operating correctly.
On the other hand, when your pressure relief valve is bad. You may notice water leaking from the tank. Even when the tap is not turned on.
This is a sign that the valve is not sealing properly and needs to be replaced. You may notice that the water pressure in your home is lower than normal.
This can be caused by a buildup of sediments in the tank. If you notice any of these signs, it is essential to call a plumber to replace your pressure relief valve.
What To Check If Your Relief Valve Leaks After Replacement?
If your pressure relief valve is faulty and still stuck open or leaking after replacing it, there may be another problem. Let’s look at some other possibilities.
- Overheating
- Water pressure
- Water expansion
- Sediment buildup
Overheating
It’s possible that the water in your tank is overheating. When your hot water heater is overheating, the pressure release valve may stay open or leak due to overheating.
Check the thermostat to see if it is set too high. If the water is still overheating, you may need a new thermostat.
Water Pressure
The valve may be kept open by high water pressure. The pressure relief valve will stay open if your water pressure is too high. This can also cause the valve to leak.
The valve may be destroyed by too much pressure. Adjust your water pressure if it’s too high or low.
Water Expansion
When hot water is used, it expands. This expansion puts pressure on the tank walls. The pressure relief valve may open to relieve this pressure.
The expansion tank may be too small or not installed correctly. Check the size of your expansion tank and make sure it is installed correctly.
Sediment Build-Up
When water is heated, it leaves sediment behind. This sediment can build up over time and cause the pressure relief valve to open or leak.
To clean the tank, open the drain at the bottom of the tank and let all the water out. You may need to do this several times to get all the sediment out.
As you can see, a few things can cause your pressure relief valve to leak after replacement. Be sure to check all these possibilities before you call a plumber.
FAQs
Why Does Hot Water Heater Overflow Keep Discharging Water?
The most likely reason is that more volume is required for the higher-temperature water. This pressure increases in a water heater when the highest possible temperature is reached.
The overflow pipe helps to regulate pressure and temperature by providing an escape route for water when the set limits are exceeded.
What Causes Too Much Pressure In A Hot Water Heater?
If the water pressure, or PSI, coming from your water source is too high, it can cause problems with the pressure relief valve in your water heater.
This might make the valve stay open or leak. You need to check the water pressure and adjust it if necessary.
Why Is Pressure Relief Valve Making Noise?
The pressure release valve on your vessel may be making noises for a variety of reasons. The most common reason is that the water pressure is too high.
This can cause the pressure relief valve to make a whining or groaning sound. Another reason for noise might be that the valve is not sealing properly and needs to be replaced.
Final Thoughts
So, that’s everything you need to know about pressure relief valves. Be sure to check your valve regularly to make sure it is working correctly.
We hope after reading this article, you may be able to know why Hot Water Heater Pressure Relief Valve Keeps Opening.
When you notice any problems, be sure to call a plumber to replace the valve.
