A step-by-step guide on descaling heat exchangers on Bosch tankless water heaters for better performance and maximized efficiency. Find out who should perform descaling and detailed instructions about the procedure and required tools.
The article about removing the limescale build-up covers most of the non-condensing and condensing water heaters from Bosch. It can also be implemented on other brands and models.
Descaling water heaters, especially tankless, is very important to keep the performance high and unit functional for many years. According to the manufacturers, flushing limescale should be done periodically, at least once a year.
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The heat exchanger is a vital element on every tankless water heater, including Bosch, and it has to withstand high thermal and mechanical stress. Due to its design, which includes small water passageways, the heat exchanger is very sensitive to limescale and mineral build-up.
If not adequately removed, the scale build-up will not only reduce the flow rate, heater's efficiency, or make the disturbing noise but will shorten its life. This is especially important if you live in an area where the water supply has a high mineral content, also known as hard water.
Descaling a heat exchanger is a critical step in keeping the water heater efficient, high performing, and long-lasting. The higher the temperature is, the greater the risk of the lime build-up is. According to the manufacturer, problems due to the water quality may void the warranty, so they also recommend installing a water softener.
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