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7 Signs You May Have Problems With Your Tankless Water Heater

7 Signs You May Have Problems With Your Tankless Water Heater

. 4 min read

Many households are now using tankless water heaters because of their functionality and convenience. Aside from the fact that it doesn’t take too much space, tankless water heaters are also energy efficient – they will only use up to 50 percent less energy compared to units with tanks.

Due to their reliability, cost, and energy-saving benefits, tankless water heaters are now a standard in many homes. If you’re looking to make the switch, you should to search for the right provider by reading tankless water heater reviews online.

In case you already have your tankless water heater at home, you should learn about the common signs and problems you may encounter with your unit, just like other appliances, it’s not immune to a few troubles you might experience. Usually, before an appliance breaks down, it exhibits signs of malfunctioning. For tankless water heaters, you need to watch out for the following.

1. The Water is Not As Warm As Before

Tankless water heaters heat water at a specific temperature and most let you dictate the temperature that you want.

If you observe that the water coming out is not the normal temperature that you’re used to, there might be a problem with your unit. It could be that someone at home adjusts the temperature without your knowledge or there’s something wrong with its heating system. If you’re unsure of how to handle the problem, you need to call a professional water heater expert to check the system.

2. The Water Has Strange Taste or Color

Tankless water heaters don’t have a reservoir where sediments can form. So, water discoloration or a funny water taste shouldn’t occur.

If you experience this and you’re sure that there are no problems with your pipes or water source, there’s a problem with your water heater. However, you should ask a professional plumber to check the whole system before you let a water heater expert check your unit. This is important because you need to check if the discoloration is not caused by your pipes or the water supply itself.

3. The Unit Is Making Strange or Unusual Noises

Tankless water heaters produce very minimal noise when they’re operating. So, when you suddenly hear unusual sounds, like groans, gurgles, or hisses, it’s an indication that it has a problem.
Once you hear that the sound becomes worse, you need to shut off the unit before you call a repair professional.

4. The Water Heater Shuts Down When There Are Too Many Taps Running

A system overload usually happens when too many people are using hot water in the house at the same time.

Take note that the system is dependent on your water heater’s capacity. When many people are using hot water simultaneously, the unit may struggle to keep up with the demand.

5. Water Flow Is Low

When you experience a reduced flow of water, it could be a sign of mineral buildup inside the water heater.

You need to check if your area gives out hard water. Hard water is rich in minerals, like calcium, that can buildup in pipes and water tanks. Mineral buildup can damage the unit, so it’s vital that you flush with vinegar or descaling solutions now and then to make sure that build ups won’t happen. Doing so will provide you with a steady flow of water.

In case buildup is already present, you need to ask a professional to handle the problem.

6. Water Suddenly Changes From Hot To Cold When Using

Like many other standard units, tankless water heaters still need a little time to heat water. Once the water reaches its desired temperature, it maintains it until you’re finished using the tap.

There will be times that you might experience a sudden change in temperature while you’re using the faucet. If it happens once or twice during your usage, it’s quite normal, most especially if the unit is still warming up.

However, if you experience changes in temperature throughout your shower or while you’re using the tap, there’s something wrong with your unit. You’ll need to ask a plumber to check your system.

7. Doesn’t Produce Hot Water At All

If the water heater is not producing hot water at all, many things could cause this problem.

For one, you might be experiencing ignition failure. There are many reasons your water heater ignition can fail. The most common is caused by gas supply. Thus, you need to check if the gas tank is full before you check anything else. You should also check if the gas or water valves are fully opened. If these steps don’t resolve the problem, you need a professional to inspect the unit.

Hot water cannot be produced if there’s also a flame failure. An issue in the gas pressure generally causes flame failure, or there’s an electrical issue in the system. You need to rule out simple causes, just like what you did in checking for ignition failure.

This one can often be solved yourself with the manual of course If all of the simple steps don’t resolve the problem, you need the help of an expert.


Hot water is essential and tankless water heaters are energy-efficient systems that help you have a constant flow of hot water in your home.

If you take note of the signs that your tankless water heater may have problems, you avoid making more significant problems for the unit. Knowing the common signs will help you check the unit for possible sources of this issue. To identify the possible causes of the issue, you need to be familiar with the system and how it runs.

If you’re in doubt or not confident enough to diagnose the problem, always ask the help of a professional.


Part of the expertEasy team in Melbourne. Mark is a keen gardener, a DIY addict and a father of two beautiful girls. He is originally from Perth and is a true Eagles fan.



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