3. Plastic Kettles Made of Thin or Low-Quality Material

Cheap kettles made of flimsy plastic may soften or warp when exposed to heat. Many are manufactured from recycled or substandard plastics that aren’t food safe.

When boiled, these plastics can release bisphenol A (BPA) and phthalates—chemicals the World Health Organization (WHO) has linked to:

• Br.ea.st and prostate can.cer
• Hormonal disruption
• Reduced fertility

Warning signs include:

• A strange plastic odor when boiling water
• Yellowing of the kettle over time
• Walls becoming soft or misshapen when hot

4. Kettles with Strange Odors or Heavy Scaling

If your kettle smells unusual (plastic-like, metallic, or burnt) or has thick brownish-yellow buildup at the bottom, the water it produces is no longer safe.

Possible causes include:

• Mineral deposits (calcium, magnesium) from repeated boiling
• Food residues or bacteria left after boiling milk, noodles, or tea
• Damage to the heating coil, releasing anti-rust chemicals into the water

Over time, consuming such contaminated water may contribute to:

• Digestive disorders
• Kidney stones
• Chronic gastritis or colitis

These conditions increase the risk of gastrointestinal cancers.

Bottom Line

Electric kettles are convenient, but unsafe models can quietly endanger your health. If yours is rusty, made of poor plastic, built with low-grade steel, or gives off odd smells and scaling—replace it immediately.

Every cup of water should support your health, not silently threaten it.