Not sure why he asked for heat. We store them in the freezer and use them to chill drinks that we don't want to dilute with melting ice. They are cool to the touch even when not kept in the freezer. Quickly cools any room-warm drink to a pleasant drinking temperature. Easy to clean, I only hand wash them. Just make sure they don't go down the drain! Makes a great gift for the person who has everything.
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