Hot Water Heater Pressure Relief Valve Keeps Opening

Our team independently selects, reviews, and identifies the best products. We may earn affiliate commissions on purchases made from links on this page. Read about our links here.

Water heaters are household appliances that we often take for granted until something goes wrong. And when something does go wrong, it’s usually a significant inconvenience.

Have you ever been taking a shower, and all of a sudden, the water just turns ice cold? It’s probably because your water heater’s pressure relief valve has opened. This valve is designed to keep the pressure in the tank from becoming too high, but sometimes it opens when it doesn’t need to.

In this post, we’ll tell you why a hot water heater pressure relief valve keeps opening and how to fit it properly to avoid chances of it opening. Read on to learn more.

What is a Hot Water Heater Pressure Relief Valve?

Comfort Room Area
Bathroom

A hot water pressure relief valve is a safety component used in hydraulic systems. These valves are made to regulate the level of pressures within these networks so they don’t get too high for any given operation, which could cause permanent damage.

The invention of hot water heater pressure relief valves was a significant breakthrough in the world of water heaters. Pressure can be dangerous, and these little guys are here to keep you safe.

Hot water heaters are designed with a pressure release valve that releases excess fluids when it senses high tension levels. The relief valves ensure your safety and security at home by preventing any potential damages from occurring before they happen.

Read: Ventless heater moisture problems

Why Hot Water Heater Pressure Relief Valve Keeps Opening?

Turning the control knob on your water faucet changes how much pressure is needed to open that valve. The more turns you make with a slight decrease in sound or flow rate as time goes by means there’s less force is generated, and thus less energy is put into opening up those spouts.

How a Hot Water Heater Pressure Relief Valve Works

Hot water heater pressure relief valves may be the most helpful device in your home. These little guys protect against over-pressurization by releasing excess air, ensuring that you don’t end up with a flooded basement or broken HVAC system.

The simple design of the valve means that there are no moving parts to seize or wear out. The pressure acting on your seat opens it through spring tension, which you can adjust with a handle at each end.

When the pressure in the system reaches a certain level, it can be relieved by opening up and closing again. This relief valve will open when there’s too much of something (high-pressure), then close once everything has been balanced out to prevent any accidents from happening.

Hot water heaters are essential to your home’s comfort. They make sure you’re always comfortable, no matter the season or time of day.

One thing that can sometimes go unnoticed about these appliances, though? The pressure relief valves – They are a safety feature that prevents your home’s system from over-pressurizing. They also ensure the dependable running of the air compression unit in any building with one installed.

Read: Venting multiple gas appliances

Woman in White Top
Hot Water Showering

The Correct Way of Fitting a Hot Water Pressure Relief Valve

Safety is the top priority when working with hot water heater pressure relief valves. These essential devices protect against damaged equipment and unsafe conditions, which means they should always be fitted and operated in the precisely right way – even if you think that’s obvious.

Here are a few handy tips to make sure your hot water heater PRVs are fitted securely and correctly in any appliance:

  • A hot water heater’s pressure relief valves should be mounted in a vertical, upright position for optimal performance. This ensures all of the heat and moisture from your shower or bath stays inside.
  • Valve removal is a tricky process, and you don’t want to overtighten the valve so as not to damage it. Overtightening can lead to leakages or, even worse, an accident with serious injuries.
  • Fit the flanged relief valves with care, ensuring that bolts are drawn down equally. This is a crucial step in ensuring that your plumbing system works as efficiently and effectively for its intended use- if not more.
  • It is essential that the inlet piping does not have a smaller diameter than your valve because this could constrict the flow.
  • To avoid any flow restrictions, ensure the outlet piping is more extensive than your valve outlet.
  • To avoid warping and leaking, ensure you support the outlet piping to not overheat in hot weather. You should also be aware of thermal expansion patterns when designing your plumbing system for maximum efficiency.

Read: Does central heating dry the air?

Water Splash on Stainless Steel Shower
Hot shower

Frequently Asked Questions Water Heater Valve

Why Would a Pressure Relief Valve Open?

When the pressure in a tank increase, it can cause some severe problems. This is because liquids expand when heated up inside of them and their volume increases. If this occurs at temperatures over 210 degrees Fahrenheit, then there will be an open valve that allows water drainage out of your tank.

When does the Pressure Relief Valve open?

When an upstream pressure exceeds the opening point, a relief valve will open and release that excess energy. This type of valve is often used with fluids that cannot be compressed like water or air because they don’t have enough stored up inside them for when things get tough.

How Do You Open a Water Heater Pressure Relief Valve?

Open the water pressure relief valve by lifting it up until its brass stem is the highest point, and hot rushing fluid will pour out of pipes near the bottom part of the tank. Push the lever back down to close and stop the flow immediately.

Although it’s a little disconcerting when your hot water heater starts making strange noises, don’t worry – it doesn’t mean the end is nigh. More likely than not, it means that the pressure relief valve has opened and is doing its job of preventing excess pressure from building up in the tank.

So next time you hear that telltale hissing sound, just be thankful that your hot water heater is working as it should. We hope this post has helped you understand why the hot water heater pressure relief valve keeps opening more often.

Read: Do tankless water heaters save money?