How long will boiling water stay hot in a thermos?

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The length of time that boiling water will stay hot in a thermos depends on several factors, such as the quality and insulation of the thermos, the starting temperature of the water, and the ambient temperature of the surrounding environment.



In general, a well-insulated thermos can keep boiling water hot for anywhere from 6 to 12 hours. However, some high-quality thermoses are designed to keep liquids hot for even longer periods of time, such as 24 hours or more.

It's worth noting that if the thermos is not completely full, or if the lid is not tightly sealed, the water may cool down more quickly. Similarly, if the thermos is exposed to cold temperatures, such as being left in a car or outside in the winter, the water will cool down more quickly.

To maximize the amount of time that boiling water stays hot in a thermos, it's a good idea to preheat the thermos with hot water before adding the boiling water. Additionally, keeping the thermos in a warm environment, such as in a backpack or in a heated room, can help to maintain the temperature of the water for longer.

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