6 Most Common Problems With Tankless Water Heaters & How To Fix Them


Facing issues with your water heater? Is it tankless? Here is your solution. This article will provide all the information regarding the tankless water heater problems along with their solution.

For your house or business, the tankless water heaters are a smart investment as they help you save money as you can heat water only when needed. The utility of these heaters is quite different from those which provide storage. Water heaters without storage are prone to issues eventually, no matter how efficient and useful they are. They have their own unique set of frequent issues, as opposed to conventional tank heaters.

Whether you go for a tank water heater or a tankless one, there are going to be problems and difficulties with both of them. Finding solutions to those problems is important. Follow through the article to know more about the problems as well as the solutions to resolve them.

Common Problems Associated With Tankless Water Heaters

Here are 6 issues that you may have to face with a tankless water heater. However, the article also provides solutions to the problems.

1. Problem: Overloading of the tank


That is one of the most common problems that people face with this type of water heater. Much ongoing hot water uses for instance showers will overload your tankless water heater, depending on its capacity. If your water heater is overloaded, it can have trouble providing enough water or it might even shut off.

Solution: By restricting the number of concurrent uses, you can lower your hot water use. You should also think about adding a second tankless water heater or upgrading to one with a larger capacity. Despite the fact that it may appear expensive at first,  you’ll end up saving more money in the long run.

2. Problem: Cold Water Sandwich Problem


You may suffer from the cold water sandwich effect with a tankless water heater. You need to be mindful of this as well. You might be aware of the cold water sandwich concept if your family routinely takes continuous showers. Imagine that one of your family members just took a shower, and it is your turn now. When you switch on the shower, you initially feel the warm water, but after a few seconds, you are hit with cold water. This happens until the temperature gradually increases again.

This occurs because even though the water hasn’t been heated after the shower has been turned off, there is still hot water remaining in the pipes. Cold water follows this hot water is released first. cold water in your shower is a result of the trapped water in the pipes.

Solution: Sadly, there isn’t a solution to stop this, but since now you’re conscious of the issue, you can’t wait to take a shower after all the cold water has been released.

3. Problem: Blockage Of Exhaust Or Air Supply

Most water heaters have a system to indicate problems with the air supply or the exhaust. This indication will mean a problem with the combustor or venting in your water heater.

Solution: First, check that all vent pipes are connected correctly and are free of any holes or punctures. Installing the heater very nearby the other objects can obstruct the airflow and cause a fire hazard.  Therefore, it is important to check the manual of the product to ensure that the clearance criteria are being fulfilled.

4. Problem: The Buildup Of The Minerals

You need to watch out for mineral accumulation in your water heater regardless of whether it’s a conventional or tankless model. An accumulation of minerals or silt may make the pipes and the heater partially or completely blocked. The two main minerals that lead to scaly buildup most frequently are magnesium and calcium, and if you don’t deal with it, it could affect how well your water heater works.

Solution: Tankless water heaters need more maintenance to last a long time. If your water filter is not checked frequently, debris may get stuck in it if not cleaned by the filter. Flushing the water heater filter half yearly will prevent harm. You need to take measures to prevent the scaly buildup.

5. Problem: Failure Of The Ignition


Ignition failure is a problem that is commonly faced. You should be aware of it. Your water heater may not ignite for a number of reasons. The gas supply is usually to blame for this problem. Your water or gas valves may not be opened wide, which could also result in a failed ignition.

Solution: Before doing anything else, ensure your gas tank is filled. Verify and fully open the water and gas valves. If following these instructions does not fix the issue, then perhaps your ignition pack has been damaged or there is a larger problem. To get assistance troubleshooting the problem, you should call technical support.

6. Problem: Failure Of The Flame


Electrical or gas pressure issues are the two main causes of flame failure. An extra small gas line, a broken regulator, problems with combustion, improper venting, and other factors are additional possible reasons for flame failure.

Solution: A depleted propane tank or perhaps an overdue gas bill are examples of basic problems that should be checked out first, much like with ignition failure. For assistance in further debugging the issue, get in touch with technical support.

So, these are the difficulties with these water heaters. They are efficient and economical, as well as may save water but again they come with certain issues that are unavoidable.


Overloading of the tank, ignition failure, flame failure, mineral buildup. Exhaust and air supply blockage, and the cold water sandwich issues, are the few issues that you need to address first for the proper functioning of your water heater. This article will help you deal with problems and provide steps to fix them.

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