Heat Pumps transfer heat from one environment to another. The heat pump absorbs heat from the environment and releases it into another environment, and can work for heating and/or cooling. This process also requires the use of external energy.

Heat Pumps use a refrigerant fluid that vaporizes when absorbing heat and condenses when losing it. The refrigerant flows through insulated tubes between the evaporator and the condenser, allowing the efficient transfer of heat energy from the outside air to the water.