Skip to content
CleaningHQSearch

Kettle

The appliance where limescale appears fastest, because heating hard water is precisely what deposits it.

Precautions

  • Disconnect from the power supply first
  • Rinse thoroughly afterwards
  • Check the manufacturer's instructions

In detail

A kettle accumulates limescale faster than almost anything else in a house, for a reason specific to the chemistry rather than to the appliance. The calcium bicarbonate dissolved in hard water becomes less soluble as the temperature rises, so heating drives it out of solution as calcium carbonate, which deposits on the hottest surfaces — the element and the base. Scale is not a hygiene problem and does not make the water unsafe, but it insulates the heating element, which slowly increases energy use, and flakes of it in the water are unpleasant. Descaling is an acid job, and the practical considerations are about the appliance rather than the chemistry: an electric kettle contains electrical components that must not be immersed, and thorough rinsing afterwards matters because whatever descaler is used will otherwise be in the next cup of tea. Kettle manufacturers generally specify a descaling method, and where they do it governs, since it accounts for the materials used in that particular model.

Related

Hacks and claims involving this

Sources for this page

Sources

  1. Handbook of Detergents (Surfactant Science Series)

    CRC Press / Taylor & Francis · Reference work

    Relied on for: That hardness salts precipitate from solution on heating, forming scale deposits.

    Verification: the work exists and is described correctly. Nobody has yet read the specific passage.

What CleaningHQ cannot answer yet

These are recorded questions about this subject that we have not yet researched to a standard we would publish.

  • Compare kettle materials for scale management
  • Descaling interval for an electric kettle
  • Effervescent tablets as a descaling route

Last reviewed by a person on .

Share this page