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Serving the Olympia, WA area since 1994



Water Heater FAQ: Why is My Tankless Water Heater Underperforming?

Monday, January 21st, 2013 at 4:47 pm

Tankless water heaters are a great addition to many homes throughout the Tumwater, WA area. They offer many benefits over traditional tank water heaters. However, we often get calls from people that their tankless water heater isn’t providing them with enough hot water or that it is working inefficiently. At Brooks Plumbing, we’ve been providing quality plumbing services in Tumwater for almost 2 decades. We thought it would be helpful if we put together some of the most common reasons why your tankless water heater might be underperforming.

Gas Supply Problem

Tankless water heaters work very well when there is low to medium demand. When there is very high demand, tankless water heaters tend to experience problems. Tankless water heaters work by heating up water very quickly which a lot of gas. The gas line into your tankless water heater allows for a much higher flow of fuel. If there is a high demand on your water heater, as there is during high demand, the flow of gas might not be sufficient and the unit will shut down.

Tankless Water Heater Exhaust Vent

Your tankless water heater monitors the heat of the exhaust that is flowing out of it. The reason for that is because the exhaust from your tankless system can get very hot and needs to be exhausted very quickly. If that doesn’t happen properly, the unit will shut down.


Many high efficiency tankless water heaters can form condensation in the exhaust vent. This condensation is highly toxic and corrosive. Normally, the condensation is collected and drained away from the system. But if it drips down the system it can cause a lot of damage.

Hard Water

If your home has hard water, mineral deposits can build up in the system and cause huge problems. It can even lead to the system failing completely.

If you’re having issues with your tankless water heater, call the Tumwater Water Heater experts at Brooks Plumbing .We have years of experience offering services for tankless water heaters in Tumwater. Call us today!

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