Air-to-water heat pumps work similarly to other air-source heat pumps except that they use water, instead of air, in the distribution system. This means that instead of blowing hot air in the winter to provide heat, air-to-water heat pumps circulate hot water in a radiator or in baseboards to provide heat to a home.  

Air-to-water heat pumps can require fewer interior refrigerant piping connections but because the hot water is delivered at a lower temperature than if it were supplied by a boiler, they can require upgrades of existing radiators and baseboards.  

Unlike typical air-source heat pumps, air-to-water heat pumps have the potential to heat domestic hot water, and they can provide cooling if they are connected to a cooling system that can use chilled water, like a hydronic fan coil.  

Air-to-water heat pumps are not widely available in the United States at this time, but there is growing interest in the technology. 

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