5 Common Tankless Water Heater Problems And How To Solve Them

Common water heater problems and how to solve them

Do you have a tankless water heater with which you’re having a bit of trouble? In this article, we’re going to go over some common tankless water heater problems and solutions to help keep your unit running smoothly. Tankless water heaters are a popular choice for many homeowners due to their energy efficiency and continuous hot water supply. But like any appliance, they can experience issues over time that may require troubleshooting and maintenance. 

Common Tankless Water Heater Problems

No Hot Water

One of the most frustrating issues with a tankless water heater is when it fails to provide hot water. This could be caused by a number of things, like a problem with a tripped circuit breaker, the power source, or a flow sensor issue. 

Begin by checking the power supply to make sure the unit is receiving electricity. If the power is fine, check the flow sensor for any obstructions or damage. Also, flushing the heater to remove mineral buildup might restore proper function.

Fluctuating Water Temperature

Another issue you might run across is inconsistent water temperature. If you notice sudden changes in water temperature while using hot water, it could be because of mineral deposits clogging the heat exchanger. 

Regular maintenance like flushing the system with vinegar or a descaling solution can help remove these deposits and restore consistent water heating.

Ignition Failure

Sometimes, a tankless water heater may experience ignition failure, preventing it from heating water at all. This could be caused by a gas supply issue, insufficient airflow, or a problem with the igniter. 

Check the gas supply to make sure it's connected and not blocked. Also, clean the air intake and exhaust vents to allow proper airflow. If the igniter is faulty, it may need to be repaired or replaced by a professional technician.


Overheating can occur if the tankless water heater's temperature setting is too high or if there's a problem with the thermostat. This can lead to scalding hot water or even damage to the unit. 

To resolve this issue, check the temperature setting and adjust it to a safe level. If you still experience issues, it's recommended you get a technician to look at the thermostat and other components for any issues.

Mineral Buildup

In tankless water heaters, mineral buildup, particularly from hard water, is a common problem. In the heat exchanger, minerals like calcium and magnesium can, over time, accumulate, reducing their efficiency and causing heating problems. 

Regular tankless water heater maintenance, including flushing the system with a descaling solution, can help prevent mineral buildup and extend the lifespan of your water heater.

Enjoy Uninterrupted Hot Water with Tankless Heaters from Water Heating Direct

Upgrading to a tankless water heater is a smart investment for homeowners in search of an efficient and reliable hot water supply. Water Heating Direct offers premium tankless solutions that provide endless hot water while eliminating downtime and costly service calls. Our team of industry experts is available around the clock to guide you through the selection process and provide exceptional customer support. 

With outstanding warranties, you can trust our products to deliver long-lasting performance. Don't settle for traditional tank heaters that risk running out of hot water. Call 401-552-HEAT or use our online form to learn more about our tankless water heater solutions today.