How Long Does a Tankless Water Heater Last?

A tankless water heater typically lasts about 20 years, although its actual life depends on water quality, usage, installation, and maintenance. That is generally longer than the roughly 10 to 15 years expected from a conventional storage-tank water heater, but either type can need replacement sooner if it is neglected or damaged.

Hard water can leave mineral deposits inside the heat exchanger, restricting water flow and making the heater work harder, while heavy daily use can put more wear on its components. Proper installation matters too: A natural gas unit needs an appropriate gas supply, venting, and combustion air, so we recommend having a qualified professional evaluate the installation and follow local requirements.

Follow the manufacturer’s maintenance schedule, including flushing or descaling when recommended, and ask a qualified technician how often your water conditions make that service necessary. You can also watch for changes such as inconsistent hot water, reduced flow, unusual noises, or recurring error codes, then arrange service promptly rather than allowing a small problem to continue.

Check the product’s listed specifications when evaluating how to help your heater last.

If your heater is approaching 20 years old and needs frequent or expensive repairs, compare the repair estimate with the cost of a replacement, including installation and any needed changes to gas or venting. If you are considering a replacement, our 7.5 GPM natural gas tankless water heater for indoor installation is one option to discuss with your installer; the right fit depends on your household’s hot-water needs and installation conditions.

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