1. Stove designed to save time and energy. Heating plates of stoves rarely match the size of the pan/pot. In order to save energy heating plates could be made so they can be adjusted to the size of the pan. That way none of the heat from the plate can be lost to surroundings. During cooking, the heat that escapes from the cooking pot can be sucked up and then reused for heating.
2. Multitasking stoves. Designed so cooking pots will absorb maximum heat and all of the lost heat can be used to charge small electronic devices like cell phones or batteries. Heat energy can be converted into electrical energy. http://physicsworld.com/cws/article/news/2013/dec/09/new-generator-creates-electricity-directly-from-heat
3. Stoves designed specifically for cold climates. Fans can be used to distribute the heat from the stove during cooking around the house to keep the house warm during cold winters.
4. I had a forth idea where sunlight energy can be used for cooking. In the places where it is sunny all year round like Hawaii or places hear equator, stoves can be using solar energy to heat up food.
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