Water-source heat pumps should be a little more stable and reliable, just the relative cost will also be a little higher.
Air energy heat pump is an air source heat pump.
Both air-source heat pumps and water-source heat pumps can cool and produce hot water.
Air-source heat pumps are suitable for places where there is air, but with the current technology in the area above minus 25 degrees Celsius can be used. And the effect is very good, there are already projects started to run and feedback.
Water-source heat pumps are suitable for water resources in areas where water resources are relatively abundant, such as artificial use of discharged but treated municipal sewage, industrial wastewater, mine wastewater, oilfield wastewater and cooling water from thermal power plants and other water sources, it is best not to choose natural water resources.
Expanded:
The working principle of water source heat pump unit is to transfer the heat from the building to the water source in summer; in winter, the energy is extracted from the water source which is at a relatively constant temperature, and then sent to the building after elevating the temperature using the heat pump principle by using air or water as the refrigerant carrier. Usually water source heat pump consumes 1kW of energy, the user can get more than 4kW of heat or cold. Water source heat pump overcomes the air source heat pump winter outdoor heat exchanger frost deficiency, and operational reliability and heating efficiency and high, in recent years the domestic application is widely used.
Baidu Encyclopedia - Water Source Heat Pump