Common Causes Why Your Tankless Hot Water Heater Is Leaking

Leone Plumbing Tankless Water Heater InstallationA tankless water heater is the best choice when it comes to energy efficiency. If you compare it with tank-style water heaters, it will only spend energy when a hot water tap is turned on or if there is an appliance being used. Since it doesn’t come with a tank, most homeowners believe that a tankless water heater doesn’t leak. However, a tankless water heater can still be susceptible to leaks. Proper care and maintenance still play an important role in the longevity of this appliance.

What causes a tankless water heater to leak and how can we deal with it?

Contrary to what everyone thought that a tankless water heater is leak-free, this appliance can begin to leak after years of use. Here are the common causes of leaks on tankless water heaters.
Improper Venting
If not properly vented, condensation can cause leaks on your water heater. It is best to follow the manufacturer’s instructions before installing the appliance. The boiler should have proper venting through its roof or wall.
High Water Pressure and Flow Rates
For optimal performance, a tankless water heater requires low flow rates at 5 GPM and pressure at 30 PSI. If it goes beyond the allowed pressure and flow rates, it may cause leaks. Always monitor the pressure and flow rates and ensure that the required numbers are maintained.
Pipe Connections
Most tankless heaters are equipped with a relief valve, but some are not. Without a relief valve, there will be a build-up of pressure in the pipe joints which can cause leaks. Make sure that your water heater has a relief valve. Otherwise, our licensed plumbers can help you find and install a relief valve that will fit your heater. Tankless Water Heater Relief Valve Water Heater Install by Leone Plumbing
Hard Water
Particles such as calcium, lime, and other minerals are present in hard water. Over time, they build up like sediment that can affect the heat exchanger which will overheat the appliance and will cause leaks as well. Regular descaling can minimize and prevent sediment build-up on your tankless heater.
Acidic Water
Corroding pipes are a leading cause of leaks on tankless heaters. Acidic water can corrode pipes and creates a pinhole that grows over time. To prevent the risk, acidic water has to be monitored and neutralized.
Insufficient Gas Pipes
You need to ensure that the gas pipes have enough room to supply the necessary amount of gas demanded by the water heater. If not, leaks from gas pipes can bring a serious problem to your home! To prevent gas problems, it is recommended to have a separate line that runs from the meter to the heater without rerouting the gas main.

You Can Combat Leaks On Your Tankless Heater

Knowing the causes of leaks on a tankless heater can help you maintain your appliance so you can use it for a long time. If you need help or if you have concerns with your tankless heater, we are here for you! Contact us anytime.
Leone Plumbing & Heating
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Joan Wania
Joan Wania

5 out of 5 stars

posted 2 weeks ago

Two different days of service included a severely clogged bathroom sink drain being cleared of decades of accumulated sludge. The action needed was more than a simple drain clearing with chemicals or a plunger. I was and am very satisfied with the degree of efficiency and persistence on the part of the two individuals who worked to resolve the clog. Water has continued to flow without any delays in the sink emptying. No leaks occurred under the sink after everything had to be pulled apart to clear the clog.

The second need for service involved a basement water back up resulting from days of heavy rainfall. Water was coming in from the floor drain and through the concrete floor. In addition, the old sump pump was working but severely deteriorated and near ready to fail. New larger drainpipes replaced old ones and a sump pump was acquired and put in place. Water was extracted with a wet vac and all areas were mopped up. Subsequent heavy rainfall has not been problematic.

I am grateful for the immediate response in both instances. The need for plumbing services happened just a couple weeks apart. In both instances, service was immediate, efficient, effective and courtesy was exemplary. I am grateful for all kindness and efficient service.

Great job! Thank you, sincerely.

Robin Bellamy
Robin Bellamy

5 out of 5 stars

posted 2 months ago

My experience with Leone heating and plumbing was great. The technician was professional, polite and informative. He represented the company well. My issue was resolved in one trip. I would recommend Leone heating and plumbing to anyone in need of a plumber.

Chris Walsh
Chris Walsh

5 out of 5 stars

posted 7 months ago

Woke up with no hot water. Needed in a hurry and was done before lunch. Easy to work with. Thx.
Andy