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Why Is My Tankless Water Heater Leaking

Are you wondering why your tankless water heater is leaking? It can be a frustrating situation, but understanding the causes and solutions can help you get it back up and running.

In this article, we’ll explore the common reasons why a tankless water heater may be leaking and what you can do to stop it. We’ll also discuss how to prevent future leaks from occurring.

Tankless water heaters are convenient and reliable pieces of equipment, but just like any other system in your home, they aren’t immune to problems. One of the most common issues that people face with their tankless water heaters is a leak.

Leaks can occur for several reasons, such as faulty parts or worn-out seals, so it’s important to identify the cause before attempting any repairs. Keep reading to find out what could be causing your tankless water heater to leak and how you can fix it.

Causes Of Leaks

Leaking tankless water heaters can be a major problem. It’s important to take action quickly to fix the leak before it causes any further damage.

There are several possible causes for a tankless water heater leak, including faulty seals, corrosion of the piping or fittings, loose pipe connections, or a malfunctioning pressure relief valve.

It’s also a good idea to check for any external leaks around the unit itself, such as from the inlet and outlet pipes. Additionally, make sure that all valves and drain plugs are properly tightened and that there is no evidence of leaking from the interior components of the heater.

If none of these issues appear to be causing the issue, contact a professional plumber to inspect and diagnose your tankless water heater. Taking these steps should help you identify and repair any leaks you may have with your tankless water heater.

How To Diagnose The Problem

Leaks in tankless water heaters can be a sign of serious trouble. It is important to diagnose the problem as soon as possible to prevent any costly damage or other risks posed by the water heater.

The first step is to determine where the leak is coming from; if it is coming from the cold-water inlet, it may indicate that the appliance needs a new filter or screen. If the leak is coming from a hot water outlet, it could be due to a damaged gasket or faulty valve. In either case, it is essential to shut off the water supply and contact a professional plumber for further diagnosis and repair.

In some cases, replacing worn-out parts may be necessary. Understanding how to properly diagnose and repair leaks in tankless water heaters can help homeowners save time, money, and effort while ensuring their household remains safe and comfortable throughout the year.

Repairs To Fix Leaks

Once you have a diagnosis of the cause of the leak, it’s time to move on to repairs.

Tankless water heaters are complex machines, and some repairs may require professional help. If you’re not confident in your ability to repair the issue yourself, it’s best to consult with a professional.

In any case, however, there are some basic repairs that can be done without any special tools or qualifications.

For instance, if the leak is coming from the pressure relief valve, it should be easy to replace with a new one.

Similarly, if pipe connections are leaking due to corrosion or wear and tear, they can be replaced with new components.

If you’re comfortable doing so, you can even replace an entire section of pipe or tubing if needed.

Additionally, there may be other parts inside the tankless water heater that need replacing such as filters or hoses – these can also be purchased easily and installed at home.

Ultimately, by taking these steps and following any instructions provided by manufacturers or professionals closely, it should not take too long before your tankless water heater is working again without leaks.

Prevention Strategies

It is important to take preventative measures to avoid the issue of a tankless water heater leaking.

Regularly inspecting the unit for potential damage or wear and tear can help reduce the chances of a problem occurring in the future.

Additionally, it is critical to ensure that all connection points are tight and secure. This will ensure that no water is escaping from any loose valves or fittings.

Finally, if you have an electric tankless water heater, be sure to check the power source regularly, as this could also be a cause of leakage.

Taking these steps can help keep your tankless water heater running optimally for years to come.

Troubleshooting Tips

It’s a frustrating and worrisome situation when you discover your tankless water heater is leaking. The good news is that there are some troubleshooting tips you can try to help prevent further damage and hopefully fix the problem.

First, check all of the connections for any loosening or damage. Make sure all connectors are tight and correctly seated. If any are loose, tighten them up with a wrench until they are secure.

Next, check to see if there is any sediment build up in the filter screen at the bottom of the heater; if so, follow manufacturer instructions to clean it out and replace it as needed.

Lastly, make sure the pressure relief valve is not blocked or damaged; if it isn’t functioning properly, replace the valve with a new one.

By following these simple steps, you can help ensure that your tankless water heater will continue working safely and efficiently without any more leaks.


Leaking tankless water heaters can be a major headache, but it’s important to remember that most of the time the problem can be fixed with simple repairs or maintenance.

It’s important to identify the problem quickly and take action to prevent further damage.

With a little bit of troubleshooting and some basic preventive strategies, you should be able to keep your tankless water heater running smoothly for years to come.

If you’re still having trouble, don’t hesitate to call our team of water heater repair professionals. They’ll be able to diagnose and repair any issues quickly so you can get back to enjoying hot showers in no time!

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