What type of water is recommended for use in a self-contained kettle?

Using distilled water in a self-contained kettle is recommended because it is free of minerals and impurities that can lead to scaling and buildup within the kettle. When water is boiled, any minerals present can precipitate out, forming deposits that can negatively affect the efficiency and lifespan of the equipment. Distilled water is processed to remove these minerals, ensuring that the kettle operates properly without the risks associated with hard water.

Additionally, using distilled water helps maintain consistent temperature control and energy efficiency since there are no minerals to alter the boiling point or create obstructions in heating elements. This practice contributes to the overall maintenance of the kettle, reducing the need for frequent descaling and repairs, ultimately prolonging the life of the equipment.

In contrast, tap water may contain various minerals and chemicals, filtered water often retains some minerals, and mineral water, by definition, contains additional dissolved minerals that can contribute to scaling. Therefore, distilled water is the most suitable choice for optimal performance in a self-contained kettle.