Water heating is a thermodynamic process that uses an energy source to heat water above its initial temperature. Typically domestic uses for hot water include cooking, cleaning, bathing and heating.
Continual Supply of hot water
Appliances that provide a continual supply of hot water are called water heaters, hot water tanks, boilers, geysers or calorifiers. These names depend on region and whether they heat potable or non-potable water, are used for domestic or industrial purposes and their energy source.
Types of Water Heating
Fuels used for Heating Water
Fossil fuels (natural gas, liquefied petroleum gas, oil) or solid fuels are commonly used for heating water. These may be consumed directly or may produce electricity that, in turn, heats water. Electricity to heat water may also come from any other electrical source, such as nuclear power or renewable energy.
Alternative energy such as solar energy, heat pumps, hot water heat recycling and geothermal heating can also heat water, often in combination with backup systems powered by fossil fuels or electricity.