How does a geothermal heat pump also heat water for my house?
Using what is called a desuperheater, geothermal heat pumps can save you up to 75 percent of your water-heating bill by pre-heating the water. When the geothermal system is operating, it pulls water from the water heater and circulates it through a heat exchanger and returns the warmed water back to the tank. Some geothermal models can provide all of your hot water needs on demand at the same high efficiencies of the forced air models.