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www.reference.com/article/examples-heat-sources-6e5a44df7f1ad44f

A few examples of heat sources are the sun, friction, chemical reactions and the earth. The sun is a natural heat source that is renewable and that can be converted into electricity.

www.reference.com/article/cheapest-heating-source-1a7478fe3369fe05

A heat pump is the most cost-effective option for home heating, but it is important for homeowners to ensure that the pump is installed correctly to ensure efficient heat production. Heat pumps utilize outside air to heat homes in the winter and cool homes in the summer...

www.reference.com/article/different-types-water-sources-fca08bc8f274221c

From water vapor in the atmosphere and ice in glaciers to all forms of liquid water in between, water sources are numerable and vary. The types of water sources depend on the state of the water.

www.reference.com/article/different-types-energy-sources-d4b612fcdeecb698

Non-renewable and renewable energy sources are the two types of energy. As the names state, non-renewable sources such as fossil fuels are not able to be used again. Renewable sources such as wind can be used over and over again.

www.reference.com/article/earth-s-primary-sources-heat-c028f466805b9d4b

Earth's primary sources of heat are from radioactive decay, frictional heating and Earth's formation. Although Earth was created around 4.5 billion years ago, there is still leftover heat from its formation.

www.reference.com/article/air-source-heat-pump-30d3fa098a560146

An air-source heat pump is an energy-efficient heating and cooling unit for the home that performs best in areas with sub-freezing winter temperatures. The device works by transferring heat from the air rather than converting it from fuel.

www.reference.com/article/cheap-types-heating-oil-7d173440f5f74857

Of the two types of heating oil intended for domestic use, kerosene is the more efficient, but heating oil number 6 is the least expensive. Aside from the two types, heating oil is also differentiated on grades.