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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
The gas that is used to heat homes is called a natural gas which is another example of a nonrenewable source. The gas that gives fuel to the barbeque is made up of natural gas and oil which are both an example of a nonrenewable source.