In my home, we used to use charcoal and I believe it is the safest source of heat for cooking. We have also been using kerosene stove for many years. Kerosene stove is the second safest source of heat but you need to be careful. We now use gas stove and I rank it as the most dangerous source of heat in my home. Do you know any other sources of heat that are dangerous? You can also give your views on the ones that I have mentioned.