An air source heat pump is a system that absorbs renewable heat from the environment and converts it into energy to heat water. Air is the best energy storage as it can absorb solar energy, heat emitted by organisms and heat from burning fossil fuels. The air source heat pump transfers energy from the surrounding air to water, thereby creating an eco-friendly energy recycling system.

The European Union classifies air energy as a renewable energy source just like wind and solar energy. The air source heat pumps have been widely promoted by the EU to achieve the goals of energy savings, reduced carbon emissions and increased use of renewable energy