Water HeaterWill My Tankless Water Heater Rust?

Short answer? Yes. Your tankless water heater is just as vulnerable to rust as any system that is constantly exposed to water. The location of the rust damage will likely be in a different place than it would be in a storage tank water heater, however. The consequences could also be more dire, since tankless water heaters are more compact and complicated systems. Let’s take a look at some of the ways that rust can affect your tankless water heater, and what to do about it.

Heat Exchanger

The heat exchanger is the part that is actually responsible for heating the water as it passes through the system. Depending on whether you have a gas or electric tankless water heater, the heat exchanger is a pipe that runs over the flames from the burner or houses the heating element. A rusty heat exchanger is a serious problem, as all water must pass through it on the way to the rest of the house. If the heat exchanger becomes corroded enough, it can rupture and cause immense damage to the entire system. It won’t be nearly as bad as having a whole storage tank water heater burst, but even so you may have to replace your whole tankless water heater. It’s a good idea to have a professional check the inside of your water heater at least once a year to make sure that the heat exchanger and other parts are in good condition.

Vent Pipes

Vent pipes are responsible for getting rid of any combustion gases that are produced, in the case of gas water heaters, as well as allowing fresh air in to cool the system. Condensation often collects on these pipes during operation, causing them to corrode. This corrosion can spread from the vent pipes to the rest of the system, destroying control circuits and possibly even blocking the burner assemblies. This is another reason to have your tankless water heater checked at least once a year by a professional.

If you haven’t had your tankless water heater checked in a while, call G&S Heating, Cooling & Electrical, Inc. We provide tankless water heater repair throughout Greenwood.


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