A newly published study has startled many people, especially those who frequently use plastic electric kettles at home or during hotel stays.

For millions around the world, boiling water with an electric kettle is a daily habit—from homes and dormitories to hotels and homestays. It’s convenient, fast, and simple, which is why electric kettles have become almost a default amenity in many accommodations. However, plastic kettles—widely used in households and lodging facilities—are now raising serious concerns among scientists.

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Billions of particles released from a single boil

According to a study published on December 1 by Dr. Elvis Okoffo from the University of Queensland (Australia), boiling water in a plastic kettle can release an enormous amount of nanoplastics into drinking water. These ultra-tiny plastic particles are even more harmful than typical microplastics and can easily penetrate the human body.

The findings showed that during the first boil, a plastic electric kettle can release up to 3 billion nanoplastic particles into just one 250 ml cup of water. Although the number decreases with subsequent boils, after 150 uses, the water still contains around 820,000 nanoplastic particles per ml—equivalent to 205 million particles in a single cup.

Dr. Okoffo explains that when plastic is exposed to high heat, parts of the material break down into microscopic particles. Tap water containing minerals can form a protective layer on the kettle’s surface, helping reduce the breakdown rate—but not enough to stop it completely.

Because of this, he recommends never drinking the first boil from a plastic kettle. Instead, boil the water once or twice and discard it. Simply rinsing the kettle is not effective because degraded plastic particles only wash away under heat.

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Many households and hotels still use plastic kettles incorrectly

Despite the widespread presence of plastic electric kettles in homes and hotels, many users are not aware of the need to discard the first boil.

Experts offer a simple but crucial recommendation:
If you use a plastic kettle, always boil the first batch of water and throw it away.

This applies not only in your home but also when staying in hotels or homestays. Doing so reduces both your exposure to nanoplastics and helps keep the kettle cleaner.

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A small habit change can reduce hidden health risks

The research from the University of Queensland highlights a surprising truth: even the most familiar household items can carry hidden dangers. Fortunately, a small change in daily routine—such as discarding the first boil—can significantly reduce the amount of plastic your body encounters.

Sometimes, protecting your health starts with a very simple step.

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