A woman from the Bernese Oberland suffered severe burns after her hot water bottle burst while she was sleeping.
She was rushed to hospital with large blisters, and still bears visible scars.
The case highlights a wider risk.
The insurance company, Suva, says there are around sixty accidents with hot water bottles or heating pads each year, often caused by cracks, bursts, or water that is too hot.
Experts warn seams can give way above 60 degrees.
Old bottles should be replaced every three to five years to avoid potentially life-changing injuries.
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