How Long Do Tankless Water Heaters Last?

Tankless water heaters have become increasingly popular in recent years due to their energy efficiency and ability to provide hot water on demand. One question that many homeowners have when considering a tankless water heater is how long they can expect it to last. In this blog post, we will explore the lifespan of tankless water heaters and provide tips for maintaining and extending their longevity. Whether you are in the market for a new water heater or simply want to learn more about the maintenance of your existing tankless system, this post has something for you.

How long does a tankless water heater last?

The lifespan of a tankless water heater is 15 to 20 years on average. But this longevity depends on proper maintenance. Proper water treatment, maintenance, and cleaning of tankless water heaters enhance their longevity by 25 to 30 years. Tankless water heaters use modern technology that helps in efficiency and functionality at the same time. However, it’s important to note that the specific lifespan of a tankless water heater will depend on a variety of factors and can vary widely.

How does a tankless water heater work?

Tankless water heaters are also known as instant water heaters. They turned on just when hot water is needed, and heat water instantaneously as per requirement. There is no water storage tank present in the Tankless water heater. That’s why they are called tankless water heaters. When the hot water faucet is turned on,  cold water flows into the heat exchanger unit. Here electric elements or gas burners do their work to heat the water. So, this was the procedure that an instant tankless water heater uses to heat water instantaneously.

Why Do Tankless Water Heaters Have a Longer Lifespan?

Tankless water heaters tend to have a longer lifespan compared to traditional storage tank water heaters due to their energy efficiency, advanced technology, and lower maintenance requirements. They only heat water as needed, have more durable components and require less maintenance, which can help extend their lifespan.

Maximizing the Lifespan of Your Tankless Water Heater: Tips and Tricks:

Looking to save money and energy while ensuring a steady supply of hot water? Discover how to get the most out of your tankless water heater with these simple maintenance and longevity-enhancing tips.

Easily replaceable parts:

If you are experiencing problems with your instant tankless geyser before it has reached its 20-year lifespan, it could be due to the wearing off of the replaceable parts.

There are no worries to change the entire tankless water heater it can easily be fixed by replacing these worn-off replaceable parts. As these parts are easily available in the market and very easy to install.


Another factor that makes water heaters, long-lasting and durable is their less tendency towards corrosion. These tankless water geysers have a lower tendency toward corrosion because they heat water instantly rather than storing it for long periods of time


It’s important to factor to install the water geyser at the right place in the home as per prescribed in the manual book. If installed in the wrong place, it may negatively impact the life span of the water heater.

Warning Signs Your Tankless Water Heater Needs Maintenance:

Is your tankless water heater not performing like it used to? Don’t wait until it’s too late – check for these warning signs that it’s time for maintenance.

Water pressure is lower than usual:

If your water pressure in the tap is falling, it is not necessarily due to water leakage. But if the tankless water heater is not working properly this also can lead to low water pressure

Hot water quality is poor:

Another thing that will indicate, your system performance is hot water quality. If hot water comes contains a cloudy and rusty appearance with a smell this is a clear-cut indication that your tankless instant water heater is out of order and needs maintenance.

Hard water:

Hard water is also the main cause of damage to your appliances. If your home has a hard water issue, it means extra minerals and salts are present in your water. On heating, these salts and minerals accumulate in water pipelines, leading to precipitate formation and start disturbing your water heater systems performance.

Tip: Use a hard water treatment plant to convert hard water into soft water.

Strange noise from the system:

If your system produces strange noises like banging and cracking this indicates that your system is going through some problem. You should pay attention to the sounds your water heater is making to know whether the voice produced is normal or indicates a problem

Energy bills are on the rise:

Tankless water heaters are ideal for energy-saving purposes. If you are noticing, your energy bills are raised suddenly, you should check your water heater.

You can’t get a steady stream of hot water:

If you are getting hot water for a few minutes and after this brief time interval again you are getting cold water. Your tankless water heater should give you a steady water flow. But if it is giving unsteady water flow. And you need to turn on the tap again and again to restart your tankless water geyser. This is a clear indication that your system has issues that need maintenance.


Do tankless water heaters need maintenance?

Generally, your water-heating instant geyser needs maintenance at least once a year. But if your home has hard water issues then your instant geyser will need maintenance twice a year. Technicians service your tankless heater’s filters and flush out the whole system.

How often should a tankless water heater be replaced?

Tankless water heater lifespan is pretty extended, mainly it is based on the maintenance of the system. If your tank water heater has spent good ten years with you, then you may buy a new system, But it can last for an average of 12 to 15 years and a maximum of 20 years with proper maintenance and care. Note: You can check your warranty cards in the system too.

What is the most common problem with tankless water heaters?

Mineralization is the most common problem in tankless water heaters. One of the main reasons behind mineralization is hard water.


To summarize, proper maintenance and water treatment can extend the lifespan of a tankless water heater by 25 to 30 years. Tankless water heaters use modern technology and generally have a lifespan of 15 to 20 years, but the specific lifespan can vary depending on various factors. It’s important to take action and perform regular maintenance to ensure that your tankless water heater lasts as long as possible. we elaborated on the factors that contribute to the maintenance and enhancement of the life expectancy of your tankless water heater. If you have any queries, you can ask in the comment box. Your feedback is fuel for us.

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