Hot water is not taken for granted everywhere in the world. It demands a lot of energy and in some countries this often means burning coal or wood. Another alternative is to take advantage of the sun. A normal plastic water botle of 10 liters covered in black can be heated to just above 80 degrees C before the plastic starts to melt down. Even 60 -65 degrees is enough for geting safe driking water. Water heaters does not have to be very complicated. A black botle is enough to get water heated up… Continue