$25 fridge powered by cooking fire

Ecogeek brings news of a low-priced refrigerator device that is powered by heat. Perfect for underdeveloped countries and storing vaccine.

The eight pound device looks like a thermos and contains a (nontoxic) refrigerant fluid. It can be heated on a cooking fire – the kind fueled by the likes of wood or camel dung. After being heated on the fire, the device is set aside to cool for an hour. At that point it begins to grow cold, and it is inserted into an insulated container of some sort – a jug, or even a hole in the ground. It gets colder and colder, bringing the temperature of the container to just above freezing, and keeping it that way for about 24 hours.