Air to water heat pumps are a type of heat pump that transfers heat from the outside air to water. They can be used for space heating, domestic hot water, and sometimes for cooling purposes. Air to water heat pumps are more energy-efficient than traditional heating and cooling systems, such as furnaces and air conditioners. They can also help to reduce greenhouse gas emissions. For more info @ https://www.theinsightpartners.com/reports/air-to-water-heat-pump-market