Milk scalds at 180F/82C. In a closed kettle, you’ll have more trouble tracking it to ensure it doesn’t boil over. If it goes over 212F/100C, the lactose proteins are ruined and the milk will get a brown film and a bad smell/taste.
Electric kettles tend to have itty bitty crevices. They can’t be submerged in water for cleaning, so a non-water liquid isn’t good for food safety.
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