What disadvantage does untreated water have in boilers?

Untreated water poses a significant disadvantage in boilers primarily due to its tendency to cause corrosion and scale formation. When water is introduced into a boiler without proper treatment, it can contain various impurities like dissolved minerals, organic matter, and gases.

These impurities lead to the formation of scale on the heat exchange surfaces. Scale is an insulating layer that reduces heat transfer efficiency, which can force the boiler to operate at higher temperatures and pressures, ultimately leading to increased fuel consumption and potential boiler failures.

In addition to scale, untreated water can also contribute to corrosion within the boiler. Corrosive substances such as oxygen and carbon dioxide can react with the metal surfaces of the boiler, leading to deterioration over time. This corrosion can weaken the structure of the boiler and could cause leaks or even catastrophic failures if not regularly maintained.

Therefore, treating water before using it in a boiler system is essential to prevent these damaging effects, ensuring the safe, efficient, and long-term operation of the boiler.