fire.
Nuclear energy is used as a source of heat. The heat from the reactor is used to heat up water and the steam moves a turbine that generates electricity. It's the same principal with a coal power plant, only the source of heat is different.
The source of energy in stoves is HEAT ENERGY
sun and fire
EM (or emergency heat) can be used if you have a problem with your other heat source such as a heat pump. In most cases, you will not need this but what it does is bi-passes the primary heat source and allows your secondary heat source (normally your furnace) to become the primary.
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the stove is used if it is a heat kettle otherwise it is electrical based
Alcohol lamp
the sun is our source of heat
The heat of the planet is used as a source of energy through geothermal power. This involves harnessing heat from deep within the Earth to generate electricity or provide heating for buildings. Geothermal energy is a renewable and sustainable source of power that can help reduce carbon emissions.
In cellular respiration, ATP is created. This energy is created with energy from other energy sources, and is used more readily by the rest of the cell.
Natural gas is used as a source of heat, from heating homes, to heating water, when something is burned it gives of energy, heat is a form of energy.