Solving Common Tankless Water Heater Problems

Oct 23, 2023

How to Solve 3 Common Tankless Water Heater Problems

How to Solve 3 Common Tankless Water Heater Problems
My Tankless Water Heater Is Not Producing Any Hot Water

Tankless water heaters have become increasingly popular because of their energy efficiency and endless hot water supply. In fact, when compared to traditional storage tank water heaters, tankless water heaters can reduce energy costs by between 24 and 34% for houses with daily hot water needs of 41 gallons or less.

However, like any other appliance, tankless heaters can encounter issues. This article will explore three common tankless water heater problems, providing solutions to running your water heater smoothly.

“My Tankless Water Heater Is Not Producing Any Hot Water.”

Problem: You turn on the hot water tap, but there’s no hot water coming out of your tankless water heater.


Check gas supply:

Tankless water heaters rely on a continuous supply of gas to heat water on demand. Ensure that the gas supply valve is fully open and that there are no leaks. If you suspect a gas leak, it’s essential to contact a professional immediately to address the issue and ensure safety.


Inspect the water supply:

Confirm that the cold water supply to your tankless water heater is correctly connected and functioning. Any disruption in the water supply, such as a closed valve or a damaged pipe, can lead to your tankless water heater not producing hot water. Ensure that the water supply is uninterrupted to maintain consistent hot water availability.


Flush the system:

Over time, mineral buildup and sediment can accumulate in the heat exchanger of your tankless water heater, diminishing its efficiency and causing a lack of hot water. To counteract this problem, follow the manufacturer’s guidelines to perform a periodic system flush, which will help remove mineral deposits and sediment, restoring your tankless water heater’s ability to provide hot water efficiently.

“My Tankless Water Heater Stops Working When I Shower”

According to the U.S. Department of Energy, tankless water heaters will provide hot water at 2-5 gallons per minute. If the demand exceeds this capacity, shutdowns may occur due to overuse, leaving you in the cold and disrupting your daily routine.

Check for overuse:

Tankless water heaters have limitations on the amount of hot water they can provide at once. If your tankless water heater keeps shutting off during your showers, it may be struggling to meet the high demand. Consider reducing water flow or using low-flow showerheads to alleviate the problem.

Inspect for fluctuating water pressure:

Inconsistent water pressure can lead to your tankless water heater shutting off. To address this issue, ensure your water pressure remains stable and within the recommended range, typically 30-80 psi. If necessary, install a water pressure regulator to maintain consistent pressure, ensuring your tankless water heater operates smoothly.

Clean the air filter:

Clogged or dirty air filters can cause your tankless water heater to overheat, triggering automatic shutdowns as a safety precaution. To prevent this problem, regularly check the condition of the air filter and follow the manufacturer’s instructions for cleaning or replacing it.

“My Tankless Water Heater Temperature Keeps Fluctuating”

Your tankless water heater cycles between hot and cold water during use, causing discomfort and inconvenience.


Inspect the water flow:

Irregular water flow can be a primary factor behind unstable temperatures in your tankless water heater. Ensure there are no obstructions or blockages in your water lines, and verify that the flow rate remains within the heater’s specifications. Proper water flow is essential for maintaining consistent water temperature.


Adjust temperature settings:

Your tankless water heater may have preset temperature settings that need adjustment. Consult the user manual to modify the temperature settings to your preferred level. This customization can help ensure that your tankless water heater consistently delivers hot water at the desired temperature.


Maintain the heat exchanger:

Mineral deposits, over time, can accumulate in the heat exchanger, leading to temperature inconsistencies. According to statistics, 1/8 inch of scale can lead to a 12% reduction in heating efficiency. Regularly flushing the system and descaling can help maintain a stable water temperature by removing mineral buildup. Ensuring the heat exchanger is clean and deposits-free is crucial for consistent hot water delivery.

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Final Thoughts

Tankless water heaters are an excellent investment in energy efficiency and convenience; however, like any appliance, they can encounter issues over time. By understanding the common problems and their solutions, you can ensure that your tankless water heater continues to provide you with reliable and efficient hot water.

If you continue to experience problems, don’t hesitate to request a new water heater price quote or schedule a water heater repair visit from a local plumber or plumbing specialist to assess your system’s condition. Regular maintenance and attention to the above common issues will extend the life and performance of your tankless water heater, keeping your showers comfortably warm for years to come.

For professional plumbing service and repair in the Greater Phoenix and West Valley communities, consider reaching out to The Plumber Guy. Our team is committed to excellence, and our plumbers are licensed, bonded, and insured, assuring you of high-quality local plumber service and solutions for all your plumbing needs. Contact us today to keep your tankless water heater and plumbing in top-notch condition.