Is Your Tankless Water Heater Leaking? Causes and Solutions

Plumbing

Blog
// Posted by Eco Heating & Air Solutions, Inc.

Tankless water heaters are getting more popular for their energy efficiency. But, even these modern systems can leak. If your tankless water heater is leaking, it's a big problem. It can cause water damage, make your system less efficient, and increase your bills.

This guide will cover the main reasons for leaks in tankless water heaters. We'll also give you tips to fix these issues. By understanding the problems and how to prevent them, you can keep your heater working well. This way, you'll have hot water efficiently for many years.

Key Takeaways:

  • Identify the source of tankless water heater leaks
  • Understand the common causes of leaks, including clogs, corrosion, and valve malfunctions
  • Learn effective maintenance practices to prevent leaks and extend the life of your tankless water heater
  • Discover when to seek professional assistance for complex issues
  • Explore options for repairing or replacing a leaking tankless water heater

Understanding Tankless Water Heater Leaks

Tankless water heaters are known for their energy efficiency and small size. Yet, they can leak, just like any plumbing system. It's important to know why these leaks happen and what they might mean for your heater.

Why Leaks Occur

Leaks in tankless water heaters can come from many things. Hard water, corrosion, and issues with the temperature valve are common causes. Problems with connections and the heater's age also play a role. These leaks can start slowly or happen suddenly, depending on the cause.

Potential Consequences of Leaks

A leaking tankless water heater can cause big problems. Water damage is a major concern, leading to expensive repairs. The leak can also make your bills go up because you use more water and energy. If ignored, a leak might even make your system fail, requiring a full replacement.

It's key to find and fix the leaks in your tankless water heater quickly. Knowing why leaks happen and acting fast can prevent water damage. This keeps your plumbing system working well and saves you money.

Common Causes of Tankless Water Heater Leaks

Hard water and mineral build-up are big reasons for tankless water heater leaks. Hard water has a lot of minerals. These minerals can block the system, making it hard for water to flow and causing leaks.

Hard Water and Mineral Build-Up

Hard water leaves behind minerals that can clog the tankless water heater. This clog can lead to leaks. It can also harm the parts inside the unit, causing more problems.

Signs of Hard Water Issues

  • Reduced water pressure
  • Inconsistent water temperature
  • Visible mineral deposits on the components

Preventive Measures

To stop hard water problems, clean and descale your tankless water heater often. Using water softeners and filters can also help. These systems cut down on minerals in the water, keeping your unit safe from build-up and leaks.

Knowing why tankless water heaters leak and acting early can save you money. It can also make your unit last longer without needing expensive fixes or replacements.

Common Causes of Tankless Water Heater Leaks

Corrosion is a big reason for leaks in tankless water heaters. Over time, the unit's metal parts can break down from being exposed to water and other substances. This can cause small holes to form, letting water leak out. These leaks can happen at the bottom or top of the heater, depending on where the damage is.

Identifying Corrosion

It's important to check for corrosion signs like rust or damage often. Catching these signs early can prevent bigger problems later. If you ignore corrosion, you might end up with expensive repairs or needing a new heater.

To stop corrosion leaks, keep your tankless water heater clean. This means flushing the system and fixing any hard water issues. Talking to a plumbing services expert can help you spot and fix corrosion problems early.

Being careful and proactive with your tankless water heater can make it last longer. This way, you avoid leaks and water damage from corrosion and tankless water heater leaking.

Common Causes of Tankless Water Heater Leaks

Your tankless water heater's temperature and pressure relief (TPR) valve is key to safety. It releases excess pressure or temperature to prevent damage or explosion. But, if it breaks, it can cause leaks.

It's important to test the TPR valve often. Just lift the lever and make sure water flows and stops when you release it. If the valve is stuck or leaks, you might need a pro plumber. Fixing TPR valve problems quickly stops leaks and keeps your heater safe.

Importance of Proper Tankless Water Heater Maintenance

Keeping your tankless water heater in good shape stops leaks and other issues. This means:

  • Regularly flushing the system to remove mineral buildup
  • Inspecting the temperature and pressure relief valve for proper function
  • Checking for any signs of corrosion or wear on the unit's components
  • Ensuring the inlet and outlet connections are properly secured

Regular maintenance helps prevent leaks and makes your heater last longer. If you see problems, call a plumbing services pro right away. They can fix the issue before it gets worse.

Fixing TPR valve problems fast is key for a safe and efficient tankless water heater. By acting fast and getting help from skilled plumbers, you keep your heater working well. This ensures you always have hot water at home.

Common Causes of Tankless Water Heater Leaks

The inlet and outlet connections of your tankless water heater can often leak. These connections might get loose or damaged over time. This can happen due to wear and tear, corrosion, or if they weren't installed right.

Loose or faulty connections let water leak. Sometimes, leaks can even happen inside your walls if the unit wasn't installed correctly.

Loose or Damaged Connections

It's important to check the inlet and outlet connections of your tankless water heater often. These connections can wear out or get loose from the constant pressure and temperature changes. Tightening or replacing these connections can stop leaks and keep your tankless water heater working well.

Proper Installation and Maintenance

Getting your tankless water heater installed by a skilled plumber is key to avoiding connection problems. A professional will make sure the connections are tight and sealed well, lowering the chance of leaks. Also, regular maintenance like flushing and descaling helps keep the connections in good shape and prevents future issues.

Fixing inlet and outlet connection problems can reduce the risk of leaks and make your tankless water heater last longer. Regular checks and quick repairs by a qualified plumber keep your heater working right and save you from expensive water damage.

Common Causes of Tankless Water Heater Leaks

The age and condition of your tankless water heater can lead to leaks. As it gets older, parts and seals can break down. This creates small holes or cracks where water can leak out. Keeping up with water heater maintenance and replacing old parts can help your heater last longer and reduce leak risks.

Experts say the tankless water heater age greatly affects leak chances. Units over 10-15 years old are more likely to leak due to wear and tear. Talking to a skilled plumbing services pro can help with maintenance plans and when to replace the unit.

Regular maintenance like flushing the system and checking connections can fight off age and wear effects. By being proactive, you can make your heater last longer and avoid leaks and water damage.

tankless water heater age

Knowing how tankless water heater age affects leaks is key. Keeping up with maintenance and replacing the unit on time ensures it works well and doesn't leak. This way, you get reliable hot water without worrying about leaks.

Tankless Water Heater Leaking: Troubleshooting Clogs

Hard water can cause clogs in tankless water heaters, leading to leaks. Minerals like calcium and magnesium in hard water form scale and debris. These blockages can reduce water pressure and cause leaks.

If you notice your water pressure is low, the temperature keeps changing, or you see mineral deposits, your heater might be clogged.

Identifying Clogs

Look out for these signs of clogs in your tankless water heater:

  • Reduced water pressure at the faucets or showerhead
  • Inconsistent or fluctuating water temperatures
  • Visible mineral deposits or scale buildup around the unit

Preventing and Resolving Clogs

To stop and fix clogs, take these steps:

  1. Flush and descale your tankless water heater regularly. This removes scale and mineral buildup that can clog it.
  2. Use water softeners and filtration systems. They cut down on minerals in your water, reducing clog risk and making your heater last longer.

Fixing clogs quickly and using these tips helps keep your tankless water heater working right. It also saves you from expensive repairs. Remember, regular upkeep is crucial for your heater's long life and efficiency.

High Water Pressure Issues

High water pressure is a common cause of leaks in tankless water heaters. If your home's water pressure is above 80 psi, it can harm the unit's parts, leading to leaks. Luckily, there are ways to fix this and keep your tankless water heater safe.

Solutions for High Water Pressure

Here are some ways to handle high water pressure and stop leaks:

  • Install an expansion tank: An expansion tank absorbs sudden pressure changes in your plumbing. This reduces stress on your tankless water heater.
  • Implement a pressure relief valve: A pressure relief valve keeps the water pressure at a safe level for your tankless water heater.
  • Adjust the water pressure regulator: Make sure your home's water pressure regulator is set correctly, usually between 50-60 psi, as recommended by the manufacturer.

Keeping an eye on and managing the right water pressure is key to your tankless water heater's long life. Fixing high water pressure problems can stop leaks and make your heater last longer.

Improper Installation and Venting

Installing and venting a tankless water heater right is key to avoid leaks and make sure it works well. If installed wrong, like with loose parts or wrong vents, it can leak. These heaters need to be set up and vented just right to work right and stop leaks from condensation.

Leaking or condensation at the flue vent is a big problem, affecting up to 20% of these heaters. Wrong venting is often the main cause, making up to 35% of leaks. About 25% of heaters need fixes because of bad venting.

To stop these issues, always follow the maker's guide for installing and venting the heater. Make sure the flue is sloped and drains well to let condensation out. Adding a drain hose to the flue vent can also stop leaks.

If you think your heater isn't installed right, get help from a skilled plumbing service. They can check it out and fix any problems to stop leaks.

Getting your tankless water heater installed and vented correctly is key to its performance and avoiding leaks. By sticking to the maker's advice and getting expert help when needed, you can protect your home from the bad effects of leaks.

Maintenance and Prevention Strategies

Keeping your tankless water heater in good shape is key to avoiding leaks and making it last longer. Regular flushing and descaling are important steps. They help keep your unit working well. Also, using water softeners and filtration systems can lessen the effects of hard water and mineral buildup. These are big causes of leaks.

Regular Flushing and Descaling

Flushing your tankless water heater often is crucial to clear out mineral deposits and scale. These can block the system and cause leaks. Experts say to flush it once a year, or more if your water is hard.

Descaling is also key to preventing mineral buildup. It uses a mild acid solution to remove scale and sediment. This keeps your heater working well and lowers the chance of leaks.

Water Softeners and Filtration Systems

A whole-house water softener can really help prevent leaks. It cuts down on mineral buildup and corrosion. This means your heater lasts longer and you don't need to flush it as much.

Adding a whole-house filtration system can also improve your water quality. It takes out sediment and other things that can cause buildup. Clean water means less chance of leaks and more reliable hot water.

Regular maintenance and prevention are smart moves for your tankless water heater. By flushing, descaling, and using water softeners and filters, you can make your heater last longer and avoid leaks. These steps ensure you have a steady supply of hot water without leaks for years.

When to Seek Professional Help

As a homeowner, you might face issues with your tankless water heater, like leaks. Some problems can be fixed on your own, but others need a professional plumber. If you're not sure what's causing the leak or if you're not comfortable fixing it, it's best to call a professional plumber.

A professional plumber can find the problem and fix it. They know how to handle many issues, like hard water, mineral buildup, corrosion, and more. They have the right tools and experience for the job.

If you see signs of serious corrosion or the leak is damaging your home, get a professional plumber right away. They can check the situation and fix it safely.

Some repairs need special tools or skills that DIYers can't handle. A professional plumber who knows about tankless water heater repair and plumbing services can do the job right. They follow local building codes too.

Working with a professional plumber means your tankless water heater is in good hands. They'll fix the problem and give you tips for keeping your unit running well. This can prevent future issues.

Repairing or Replacing a Leaking Tankless Water Heater

Dealing with a leaking tankless water heater can be frustrating. You have options to fix it. The choice between repair or replacement depends on the damage, the heater's age and condition, and repair costs.

Repairing a leaking tankless water heater might save you money. Common leaks come from clogs, corrosion, faulty valves, and connection problems. These can often be fixed with maintenance like flushing and descaling, or by replacing parts.

If your heater is old or repairs would cost over half of a new one, consider replacing it. New models are more energy-efficient and can save you money on bills over time.

Before making a decision, talk to a professional plumbing service. They can check your heater, tell you what repairs or replacement you need, and help you choose wisely. They consider your home's needs, your budget, and the heater's future performance.

Fixing a leaking tankless water heater means finding and fixing the leak's cause. Regular maintenance can prevent many problems. But if the damage is big or the heater is old, replacing it might be best. A professional can make sure your heater works well and gives you hot water reliably.

Conclusion

Tankless water heaters are known for saving energy, but they can still leak. Knowing why leaks happen, like hard water or bad connections, helps fix and prevent them. Regular tankless water heater maintenance, like cleaning and checking for problems, is key.

Also, getting help from plumbing services when needed keeps your heater working well. Taking care of your heater early can stop leaks and save you from water damage. This way, you can enjoy the heater's benefits for a long time.

Checking for hard water and inspecting connections can help stop leaks. Being careful and fixing issues fast keeps your heater efficient and working right. This means you always have hot water without worrying about damage.

Even though tankless heaters have many good points, they need the right setup and care. Knowing what causes leaks and fixing them early keeps your heater running well. This lets you enjoy the heater's energy-saving benefits for many years.

Electric Heat pump outside
About Eco Heating & Air Solutions, Inc.
Residential and light commercial heating, cooling, air quality, and plumbing are specialties at Eco Heating & Air Solutions, Inc. We provide home and business owners in Oak Ridge, TN and surrounding areas free estimates, service of all makes and models, and trusted solutions to everyday requirements.

We are an eco-friendly, award-winning company and uphold Better Business Bureau accreditation. Our team of professionals is NATE-certified, drug-free, and dedicated to earning your approval and loyalty.

FAQ

What are the common causes of tankless water heater leaks?

Tankless water heater leaks can happen for many reasons. These include hard water and mineral build-up, corrosion, and problems with the temperature and pressure relief valve. Issues with inlet and outlet connections and the unit's age and condition also play a part.

How can hard water and mineral build-up lead to tankless water heater leaks?

Hard water can cause scale and debris to block the system. This can lead to leaks. Signs of hard water include lower water pressure and inconsistent temperatures. You might also see mineral deposits.

What are the effects of corrosion on a tankless water heater?

Corrosion can weaken the metal parts of a tankless water heater. This can cause small holes to form, letting water leak out. Leaks can start at the bottom or top of the unit.

How can issues with the temperature and pressure relief (TPR) valve cause a tankless water heater to leak?

A faulty TPR valve can cause leaks. It's important to test the valve by lifting the lever. If water flows freely and stops when you release the lever, it's working right. But if it leaks or gets stuck, you might need a professional plumber to fix it.

How can problems with the inlet and outlet connections lead to tankless water heater leaks?

Over time, connections can get loose or damaged. This can happen from wear, corrosion, or if they were installed wrong. Loose or damaged connections can let water leak out. Sometimes, leaks can even happen inside walls if the unit wasn't installed correctly.

How does the age of a tankless water heater contribute to the risk of leaks?

Older tankless water heaters can have worn-out parts and seals. This can lead to leaks. Keeping up with maintenance and replacing old parts can help your heater last longer and reduce leak risks.

How can clogs caused by hard water and mineral buildup lead to tankless water heater leaks?

Hard water can make scale and debris that block the system. This can cause leaks. Look for signs like lower water pressure and inconsistent temperatures. You might also see mineral deposits. Flushing and descaling your heater can help prevent these clogs.

How can high water pressure contribute to tankless water heater leaks?

High water pressure can damage the heater's parts and cause leaks. Installing an expansion tank and a pressure relief valve can help control the pressure. This can prevent leaks.

How can improper installation and venting lead to tankless water heater leaks?

Wrong installation or venting can cause leaks. Tankless water heaters need to be installed and vented just right. This ensures they work well and don't leak from condensation.

When should you seek professional help for a leaking tankless water heater?

If you're not sure why your heater is leaking or if you're not comfortable fixing it yourself, get a professional plumber. They can find the problem and fix it or replace what's needed.

Electric Heat pump outside
About Eco Heating & Air Solutions, Inc.
Residential and light commercial heating, cooling, air quality, and plumbing are specialties at Eco Heating & Air Solutions, Inc. We provide home and business owners in Oak Ridge, TN and surrounding areas free estimates, service of all makes and models, and trusted solutions to everyday requirements.

We are an eco-friendly, award-winning company and uphold Better Business Bureau accreditation. Our team of professionals is NATE-certified, drug-free, and dedicated to earning your approval and loyalty.

Related Blog Posts

Say Goodbye to Clogs
Quick fixes like plungers and natural cleaners can solve minor clogs, but persistent issues need expert help. Prevent blockages with drain covers, hot water flushes, and proper grease disposal.
Read More →
The 2025 Grammy Nominations Are In
The excitement of the 2025 Grammy nominations is in full swing, and whether you’re hosting a watch party or simply enjoying the evening in comfort, Eco Heating and Air Solutions wants to ensure your home is ready for a smooth, stress-free experience. From keeping your home cozy to ensuring your systems are running smoothly, here’s how to prepare your heating, cooling, plumbing, and power systems for a Grammy-worthy night.
Read More →
Prepping Your Knoxville Home for a Cozy Election Night
Election night is a time to gather and relax, and Eco Heating and Air Solutions wants to help make sure your Knoxville home is ready for a smooth, comfortable evening. Here’s how to get your heating, cooling, plumbing, and power systems prepped for an enjoyable night in.
Read More →
The Annual Cost of a Water Heater Bill Explained
By grasping the average costs and factors influencing your water heater bills, you can take proactive steps to enhance efficiency and reduce expenses in your home. From routine maintenance to potential upgrades, every effort helps. I
Read More →
Eco-Friendly Upgrades for Your Cat on National Cat Day
Celebrate National Cat Day by creating a cozy, eco-friendly home for your feline friends with upgrades like energy-efficient HVAC systems, clean water solutions, and low-noise generators. Discover how to maintain a sustainable and pet-friendly environment!
Read More →
Get Winter-Ready Daylight Saving Tips
As Daylight Saving Time ends, it's essential to prepare your home for the upcoming winter months with key maintenance tips. From furnace check-ups to pipe insulation, these simple steps will help ensure your home remains cozy, safe, and energy-efficient all season long.
Read More →
Halloween Fun in Knoxville, TN
Halloween in Knoxville is full of exciting events for all ages, offering everything from haunted houses to kid-friendly trick-or-treating. Make sure to explore the wide range of activities Knoxville has to offer for a spooktacular October!
Read More →
Plumbing Myths Busted
Debunks common plumbing myths for Knoxville homeowners, emphasizing the need for proper maintenance and professional help. Understanding these misconceptions can help you manage your plumbing system effectively.
Read More →
First Frost Prep: Your Guide to HVAC, Generators, and Plumbing in Dunlap, TN
As the first frost blankets Dunlap, TN, it’s time to get your home ready for the colder months ahead. Ensuring your heating systems, emergency generators, and plumbing are well-maintained is essential for comfort and safety as temperatures drop.
Read More →
HVAC Technician working on an outside ac unit

Need HVAC Service? 
Contact Us Today!

Stay comfortable year-round! Don't wait for a breakdown. Click here to schedule your HVAC repair or installation today!
Say Goodbye to Clogs
Quick fixes like plungers and natural cleaners can solve minor clogs, but persistent issues need expert help. Prevent blockages with drain covers, hot water flushes, and proper grease disposal.
Read More →
How Does a Heat Pump Work in Winter?
Heat pumps warm homes by transferring heat from outside air, even in freezing conditions, making them highly efficient. Maintain steady thermostat settings, clear outdoor units, and schedule regular maintenance for optimal performance.
Read More →
Tips for Healthy Indoor Air
Follow these easy steps for a cozy, healthy winter, and reach out to Eco Home Solutions in Knoxville for expert assistance. We’re here to make sure your home stays comfortable all season long!
Read More →