What Is Relief Valve In Water Heater?

Everyone has definitely heard about a water heater, but have you ever been curious to know about the specifics of the device? Most of us rely on hot water for many activities, from showering to washing dishes and even doing laundry.

In order to enjoy the convenient and indispensable capability of a hot water heater, it is vital to understand the component of relief valves. Without having a proper understanding of relief valves, the entire system of hot water heater may be in danger. It is time to explore further and understand how relief valves play an essential role in providing us with hot water!

What is Relief Valve in Water Heater?

A relief valve is a safety device used in a water heater to provide a release point in order to prevent pressure build up in the system.

It is a critical component of a water heater as it helps protect your plumbing system and home from water damage due to an over-pressured system.

How Does a Relief Valve Work?

A relief valve works by automatically opening to discharge water from the heater tank when the pressure rises too high.

The valve opens to relieve pressure and prevent the system from exploding. The relief valve is connected to a pipe that is vented to the outside of the home so the water that is released is not discharged into the home.

What Does a Relief Valve Look Like and Where is it Located?

A relief valve is typically a metal cylinder slightly larger than aAA battery, and it is located either on the top or the side of the water heater. The relief valve has a built-in pressure gage that is used to measure the pressure in the system, and it is connected to a pipe that releases the pressure when needed.

Why Do You Need a Relief Valve?

A relief valve provides an essential safety feature for your water heater system. Water heaters can become over-pressurized and explode, causing massive damage to your home, property, and personal safety.

A relief valve helps prevent this by providing a release point for the pressure when it gets too high. Without the relief valve, the pressure would accumulate and the only way for it to be released is for the system to explode.

What to Do When Your Relief Valve Is Leaking?

When a relief valve begins to leak, it may indicate that the pressure in the system is too high. You should check the pressure gage on the valve and make sure it is in the correct range for your water heater. If the pressure is too high, you may need to adjust the temperature of the water or have a plumber come and make adjustments. It is also possible that the relief valve itself is bad and needs to be replaced.


Relief valves are an important safety feature of a water heater system. If your heater has a relief valve that is leaking, it’s important to have it inspected and repaired or replaced by a professional. Proper maintenance of your relief valve helps keep your home and family safe from water heater malfunctions and explosions.

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