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Taking a hottie to bed this winter may be one of the most energy-efficient ways to stay warm. A hottie uses less energy than an electric blanket or a space heater, and a hottie can help you keep your body hot and your thermostat down, night after night, all winter long. A hottie, by the way, is New Zealand-style slang for a hot water bottle. The other kind of hottie may also be a great way to warm a bed, but that's a different post for someone more mature.