Leaky Pressure Relief Valve? Here's How To Stop It For Good
Is your water heater's pressure relief valve constantly dripping or leaking water? Those annoying leaks not only waste water but can also cause water damage if left unfixed. Replacing or repairing the valve yourself can seem daunting if you're not familiar with plumbing repairs. However, stopping a leaky pressure relief valve is a manageable DIY project for most homeowners. With a few tools and simple steps, you can stop the leak for good.
You'll learn what causes these leaks in the first place, what your different options are to fix it, and a full step-by-step guide to stop the dripping once and for all.
What Is a Pressure Relief Valve and What Causes It to Leak?
A pressure relief valve, also known as a PRV, is an important safety device installed on most residential water heaters and boilers. It's designed to automatically release excess pressure from the system to prevent an explosion. The valves are normally closed but will open when the pressure exceeds the valve's preset limit, allowing hot water to escape.
There are a few common reasons why a pressure relief valve can start to let out small drips or leaks:
- Sediment buildup due to minerals in water
- General wear and tear
- Improperly adjusted water pressure
- Corrosion
Even minor drips from a PRV can waste hundreds of gallons of water over time. Identifying and fixing a faulty valve quickly can save on your utility bills and prevent water damage around your hot water heater.
How to Replace a Pressure Relief Valve
If your valve is leaking, the best solution is usually to replace it. Here are the steps involved:
- Turn off the power to your water heater and shut off the water supply.
- Open the water heater drain valve to empty the tank completely.
- Use a wrench to detach the overflow pipe from the old pressure relief valve.
- Unscrew and remove the faulty pressure relief valve.
- Wrap plumber's tape around the threads of the new valve.
- Screw in the new pressure relief valve.
- Reattach the overflow pipe pointed away from the tank.
- Turn the water supply back on and check for leaks.
This straightforward valve replacement process takes less than an hour for most DIYers. Have a bucket and towels handy to catch any drips when detaching the old valve.
Key Points for Replacing a Pressure Relief Valve
- Always discharge the pressure and drain all water from tank before starting.
- Use plumber's tape to seal the threads and prevent leaks.
- Make sure overflow pipe directs water away from the tank.
- Check for leaks once water supply is turned back on.
What If Replacing the Valve Doesn't Fix the Leak?
In some cases, a brand new pressure relief valve can still leak or drip water. If that happens, there are a few other things you can check:
Inspect the Water Pressure
Excessive water pressure entering your home can overpower the valve. Install a pressure regulator on your main water line to keep the pressure between 50-60 PSI. You can also install an expansion tank, which absorbs pressure spikes.
Check the Water Heater
Sediment buildup or a faulty heating element can also lead to leaks. Flush out the water heater per the manufacturer instructions. Replacing old heating elements or anodes can also help.
Adjust the Temperature Setting
Extremely hot water temperatures put added strain on the valve. Lower the temperature setting on your water heater to around 120degF.
Checking these other issues stops the valve from leaking in most cases if replacement doesn't work. Call a plumber if you continue experiencing issues.
While pressure relief valves will wear out over time, you can take a few proactive steps to maximize the lifespan and prevent annoying leaks:
- Inspect the valve during annual water heater maintenance.
- Remove any accumulated sediment or mineral deposits.
- Lubricate the valve stem yearly.
- Install a pressure regulator and expansion tank.
- Set water heater temperature between 120degF - 140degF.
- Place a drain pan under the hot water heater.
Catching small leaks quickly can save hundreds of gallons of water waste over time. Bookmark this guide so you know exactly what to do when your pressure relief valve starts dripping. With the right preparation and tools, you can stop those leaks for good and prevent damage around your water heater.