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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 greatest source of heat transfer to water temperature is from sunlight 36. Sunlight, or solar radiation, is a form of thermal energy 45. This energy is then transferred to a waterâs surface as heat, increasing the temperature of the water. This heat transfer is due to waterâs relatively low albedo 44. Albedo is the determined quality of a surfaceâs ability to reflect or absorb sunlight.