When you are considering switching to tankless water heaters, you might be curious about how long they will last. Tankless water heaters are expensive and you need to be sure they will last.

Good news! Tankless water heaters are more durable than traditional water heaters. How long should you expect to use your tankless water heating system? Let’s have a look at the details.

The Lifespan Average of a Tankless Hot Water Heater

With proper maintenance, a tankless heater can last on average up to 20 year. This is much longer than the typical tank water heater that lasts between 8-12years.

The lifespan of a tankless water heater is dependent on several factors. These include usage, maintenance and water quality. Let’s take a closer look.


Your tankless water heater has to work harder if you use more hot water. It can reduce its lifespan. This can affect its lifespan. For example, households that use a large amount of hot water in their showers, for washing dishes and clothes, may live shorter than those that do not.


To ensure that your tankless water heater will last as long as it can, you must maintain it properly. This involves flushing out the system to remove any minerals, checking the relief valve, and inspecting any signs of wear on the gas burner.

Water Quality

Tankless water heaters can also be affected by your water quality. Hard water containing high levels of calcium and magnesium minerals can lead to mineral buildup, resulting in reduced efficiency and eventual failure.

How to prolong the lifespan of your tankless heater

You can extend the life expectancy of your tankless hot water heater by taking certain steps.

First, ensure that you hire a professional to install your tankless water heating system. A poor installation can result in performance issues or premature failure.

Plan regular maintenance appointments with a technician who is qualified. The flushing of the system and the checking of the pressure release valve will help to prevent mineral accumulation and ensure the tankless water heater functions properly.

If you have hardwater, invest in a water conditioner. This can prevent mineral accumulation and extend the lifetime of your tankless hot water heater.

You can also read our conclusion.

Conclusion: A tankless heater can last as long as 20 years, provided it is maintained, used properly, and has good water quality. By taking the steps necessary to prolong the life of your tankless hot water heater, it is possible to get the best return on your investment. You should have your tankless hot water heater professionally installed, have regular maintenance performed, and consider purchasing a water softener, if you live in an area with hard water. You can have hot water that is reliable for many years if you follow these simple steps.