Some people tightly close the kettle lid while boiling water to retain heat. However, this practice may trap volatile chemical byproducts inside the water.
During boiling, disinfected tap water can release chloroform and other disinfection byproducts. Normally, these substances evaporate with steam. When the lid is sealed tightly, these gases cannot escape and instead dissolve back into the water, increasing their concentration.
Prolonged heat retention under a closed lid may further intensify this effect. Chloroform exposure has been associated with liver damage and increased cancer risk when consumed over long periods.
Key point: When boiling water, the lid should be slightly open to allow volatile substances to escape.
3. Using Old or Heavily Scaled Kettles
Limescale at the bottom of kettles is often mistaken for harmless mineral residue. In reality, scale can trap heavy metals such as lead, cadmium, arsenic, nickel, or chromium, depending on water quality and kettle material.
As kettles age and are repeatedly heated, these metals may gradually leach into the water. Scrubbing only removes surface deposits, while deeply bonded compounds cannot be eliminated through simple cleaning.
Long-term intake of heavy metals may lead to accumulation in the liver, kidneys, and nervous system, increasing the risk of chronic toxicity and neurological disorders.
Key point: Kettles should be descaled regularly and replaced every few years, especially if heavy buildup is visible.
Safe Water-Boiling Practices to Protect Health
To reduce potential health risks, consider the following recommendations:
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Always use fresh water; avoid reheating old water.
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Leave the kettle lid open or partially open while boiling.
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Descale kettles regularly and replace them every 2–3 years.
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Use clean, regulated tap water rather than water from unknown sources.
Proper water-boiling habits may seem minor, but over time they can have a meaningful impact on long-term health. Small daily adjustments can help ensure that something as simple as drinking water remains safe and beneficial for the whole family.
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