Which type of boilers require demineralized water?

High pressure boilers, particularly those operating at pressures over 1,000 psi, require demineralized water primarily due to the stringent demands placed on the boiler systems at such elevated pressures. The presence of minerals and impurities in water can lead to significant issues such as scaling, corrosion, and foaming, which can adversely affect the performance and longevity of the boiler.

In high pressure environments, the steam produced needs to be of high purity for efficiency and safety. Impurities, including dissolved solids, can lead to the formation of scale on heat exchange surfaces, which reduces heat transfer efficiency and can cause overheating and failure of components. Demineralized water has had its mineral content reduced significantly, making it ideal for use in high-pressure boilers where maintaining clean and efficient operation is critical.

This requirement sets high pressure boilers apart from residential and lower pressure systems, which may tolerate a higher level of impurities without immediate catastrophic failure. Using demineralized water in high pressure boilers helps ensure that operational safety standards are met and that the boiler system runs efficiently over its operational life.