Why Noritz Tankless Water Heater Leaking [Reasons + Solutions]

Your Noritz tankless water heater leaking because of the leading reasons, including improper installation, blocked pipelines, accumulated sediments, high water flowing, faulty venting system, and so on.

Whatever the factors, install as the manufacturer instructed and tighten the system connections to protect the risk of leakage of the Noritz water heater.

Fortunately, we have explored all the reasons that lead to leaks and shown their effective solutions. So, go through the article and solve your heater’s leakage problems instantly.

Why Noritz Tankless Water Heater Leaking [Reasons + Solutions]

Here, we will find out the most common reasons why your Noritz tankless water heater is leaking and guide you on how to solve them easily. So, let’s scroll down.

Note: You can also read how to fix the Noritz tankless water heater with no display problem.

1. Faulty Installation

A faulty installation is primarily responsible for leaking your new Noritz tankless water heater. Here, the entire water supply may fail because of improper installation.

Your Noritiz tankless water heater may lead to leaks due to improper installation of-

  • Poor water pipe connections
  • Faulty gas pipelines
  • Improper venting system &
  • Too high water flow.  

Solution

  • First, if possible, try to shorten the venting system lines and join parts. The process will save you money and protect the risk of leakage through the pipelines and the connections. So, recheck if all the connections are in good condition.
  • Proper installation is the key to protecting condensation that may create a leak with your water heater. So, make sure, the installation is done properly according to the manufacturer’s instructions on the venting process. In this case, you might get some help from a local plumber.
  • Again, if you face water dripping from the bottom of the heater issue, follow the tips.
  • Isolate the heater from power.
  • Shut off the cold and hot water supplies (if you have isolated valves).
  • Turn the gas valve to the off position.
  • Remove or drain storage water from the unit by the isolator valve on the bottom of the heater. Besides, you can use a black plastic drain plug to drain the water.
  • Go back to the plug and place all the units to run the heater as usual.

2. Accumulation Of Sediments

The accumulation of sediment is the next culprit that causes the leaks with the Noritz tankless water heater. Building up sediment in the water pipelines is considered a bad water condition. You may face this acute problem if your living area contains hard water.

A bad or hard water condition means that you are getting blue-green water in your bathtub, drains, and faucets. Plus, it bears mineral sediments containing magnesium and calcium, which eventually accumulate in the piping system.

Then, the acid water creates a pinhole in the pipelines and causes a leak. Over time, this ongoing system will have a negative effect on the heat exchanger because of overheating.

As a tankless water heater has no tank to the reservoir, it heats the water directly through a heat exchanger. With sediment buildup, the heater exerts significant pressure on the heat exchanger. Finally, it wreaks havoc on your tankless water heater.

Solution

  • When you get a bad smell or acid water after turning on your heater, it is warning you to flush or drain your pipelines from any sedimentation buildup.
  • At least twice a year, clear out your heater pipelines and pumping system.
  • The best solution is to install an acid neutralizer that will help raise the water PH.
  • The neutralizer should be installed at a point where it interacts with the water before entering your household plumbing system.
  • Hopefully, it will prevent pinholes and cracks in the plumbing system of your tankless water heater.
  • Besides, you can install a water softener to minimize or prevent leakage. Actually, it also helps to eliminate calcium, magnesium, and other minerals from the water before it enters the piping system of the water heater.
  • Watch the below video to flush your heater easily.

Note: If you are not good at installing water softeners or acid neutralizers, call a certified plumber to install them safely.

3. Defective Venting System

Another common cause of Noritz tankless water heater leakage is a faulty venting system in the gas line. Normally, the venting system goes through the roof and the walls to ensure optimal performance for your water heater.

A proper venting system installation ensures that there is no condensation going through the water heater. And, it helps in minimizing leakages.

But without proper venting, the heater may drip or leak into the system, and then you’ll smell incomplete combustion of gas. Finally, it may stop the entire operation.

defective venting system

On the other hand, water is dripping from the bottom of the Noritz water heater, which hints at an internal leak or rain water has entered through the exhaust vent.

Solution

  • First, if possible, try to shorten the venting system lines and join parts. The process will save you money and protect the causes of the leakage through the pipelines and the connections. So, recheck if all the connections are in good condition.
  • Proper installation is the key to protecting condensation that may create a leak with your water heater. So, ensure a proper installation according to the manufacturer’s instructions on the venting process. Here, you might get some help from a local plumber.
  • Again, if you face water dripping from the bottom of the heater issue, follow the tips.
  • Isolate the heater from power.
  • Shut off the cold and hot water supplies (if you have isolated valves).
  • Turn the gas valve to the off position.
  • Remove or drain storage water from the unit by the isolator valve on the bottom of the heater. Besides, you can use a black plastic drain plug to drain the water.
  • Go back to the plug and place all the units to run the heater as usual.

4. Too High Water Flowing

A high water flow rate or pressure is the next major cause of your Noritz tankless heater heat exchanger leaking water. A tankless water heater heats the cold water with the heat exchangers and supplies hot water to the pipes directly.

heat exchanger of noritz tankless water heater

The Noritz tankless water heater performs well with a 5 GPM flow rate and a pressure system of 30 PSI for the residential areas.

The heater is designed to work well with a low flow rate and low water pressure. But, high flow rates and high water pressure lead to leaks in your water heater.

As a result, you will face your Noritz tankless water heater with no hot water. However, here is an easy tip to fix the problem.

Solution

  • First, check for debris and rust in the showerhead and faucet areas. If you find any debris, clean the accumulated debris completely from the faucet aerators as a part of regular maintenance. The process also protects you from being fired up by debris.
  • Plus, it is easier to solve the problem with a low flow rate than with a high flow rate to get optimal performance. Ensure the flow rate is roughly 19 GPM with pressure but doesn’t cross 30 PSI for your residential area. 

5. Blocked Inlet & Outlet Pipes

A blocked outlet and inlet pipes are also contributing factors to dripping water with your Noritz tankless water heater.

Tankless water heaters draw power either from electricity, gas, or propane. So, it requires an extra exhaust pipe connection to expunge the poisonous gasses from the exterior house.

Unluckily, the gas leakage may happen due to the pipe connection getting loose.

Plus, birds can build nests in the exhaust pipes. Over time, the rodent or the bird’s nest might clog the exhaust pipelines. However, you will get an alert error message for such occurrences to repair the gas leak.

Solution

  • To check for gas leaks, turn off your water heater first. Keep the pressure switch in the off position.
  • Check the exterior exhaust (inlet and outlet) pipes for blockage. If you see rodents or birds have clogged the pipeline’s nests, remove them entirely.
  • Yet, if you get the error code again on your control panel for your water heater, call a professional plumber to fix leaks in the gas lines.

6. Relief Valves Problems

The relief valve is on the hot water (outlet) discharge pipe that allows you to supply the rest of your water fixtures.

relief valves problems

If the tankless water heater doesn’t come with a relief valve, it will be prone to internal and external leakages. These valves are a safety measure for pipe joining when the heater’s pressure builds up.

Again, relief valves become necessary during flushing and draining of the tankless water heater system.

Solution

  • To fix the issue, first, to ensure the water leaks, check if there is a relief valve. Inspect the valves are well tightened as the valves reduce the risk of leakage.
  • If the pressure release valve drips due to its fault, replace it immediately.
replace the relief valve
  • Close the inlet supply valve by turning it to the right.
  • Switch on a few water fixtures.
  • Remove the inlet and outlet drain caps and get ready to catch drain water.
  • Now open up both the drain valves and clean the filters with your fingers under running water to clear out any debris.
  • After drying it, put it back in the inlet port. Now, close the drain plug and reinstall the caps.
  • Then, turn off the water fixtures that you turned on once.
  • Check for any water leaks from the water drain valve by opening the water supply valve.
  • Make sure an adjustable kit is right for your heater’s size. If it doesn’t, the plumber will assist you in installing it correctly.
  • Observe the water pipe connections when you are installing them.
  • Hopefully, you won’t face any leak problems in no time.

7. Gas Supply Issue

People love tankless gas water heaters as they save energy. It can perform best when there is enough gas supply. Because of unknown factors, the existing gas pipe may not supply the right amount of gas to run the function.

If the system fails in providing sufficient gas to the lines, the pipes might go through overpressure. Besides, gas control may pass gas through the burner and knob shaft. Then, the system leads to dripping or leaking.

Solution

To minimize the chances of gas leaks, try to minimize the joints when setting up and, if needed, ensure a separate gas line has run to the water heater without re-running the main gas entirely.

dealing with gas leak

A gas leak is an emergency phenomenon. So, only an expert plumber can handle the gas piping system to reduce the risk of leaks. 

Maintenance Of Noritz Tankless Water Heater

You should take care periodically of your tankless water heater to minimize the risk of leakage, both internal and external. Let’s follow some effective steps on how to keep your water heater fit for long usage.

  • Have a visual inspection of the combustible materials.
  • Listen deeply if it is making any sound during the operation.
  • Wipe the surface of the heater with the remote control with a wet cloth, then dry.
  • Apply a neutral detergent to clean it.
  • Check for dust and soot in the exhaust and clean and brush debris so that air can flow through the system.
  • Inspect periodically the control valves if it gets leaked and verifies everything is fitted correctly.
  • Even if you notice any broken or defective parts, replace them immediately to avoid the next risk. 
  • Hopefully, you won’t face leakage issues with your Noritz tankless water heater soon.

Maintenance Of Noritz Tankless Water Heater

You should take care periodically of your tankless water heater to minimize the risk of leakage, both internal and external. Let’s follow some effective steps to keep your water heater fit for long usage.

  • Have a visual inspection of the combustible materials.
  • Listen deeply if it is making any sound during the operation.
  • Wipe the surface of the heater with the remote control with a wet cloth, then dry.
  • Apply a neutral detergent to clean it.
  • Check for dust and soot in the exhaust and clean and brush debris so that air can flow through the system.
  • Inspect periodically the control valves if it gets leaked and verifies everything is fitted correctly.
  • Even if you notice any broken or defective parts, replace them immediately to avoid the next risk. 
  • Hopefully, you won’t face leakage issues with your Noritz tankless water heater soon.

FAQs:

How does a Noritz tankless water heater work?

The Noritz tankless water heater draws cold water from the supply line and inflows it into the high-power burner and passes through the heat exchanger. This mechanism enables us to give you instant hot water.

What can I do right after an electric water heater starts leaking?

You should switch off the breaker to the water heater and turn off the valve that supplies water through a hose to the drain on the bottom of the heater. Call a plumber to repair it.

Could you repair a leaking tankless water heater and how?

Yes. Most leakages are repairable by yourself. A corroded pipe is maintainable, but corrosion that leads to a leak in the heat exchanger is irreparable and needs to be replaced. Install a water softener to prevent leaks.

What is acidic water with a water heater?

Acidic water (PH 6.5 or below) contains corrosive properties that lead to pinholes in the pipelines and eventually lead to a leak. Eventually, it will wreak havoc on your water heater’s piping function.

What might happen if you ignore the leak in the tankless water heater?

A tankless water heater also leads to leaks at the bottom or along with connections. First, it may seem like no big deal at all, but over time, the leakages can cause catastrophic failure if not considered seriously.

Conclusion

Already, we have explored all the culprits behind your Noritz tankless water heater leaking and guided you on how to fix the issue.

So, follow our above guide on tankless water heater leaking issues whenever you struggle to solve your water heater’s leakage problem.

Yet, if you encounter any other issue with dripping or leaking, let us know in your comments. We will come to you as soon as we can.

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