Before we go into the specifics of the different designs, we will briefly explain the working principle of a heat pump. Regardless of which type of heat pump you use, they are always efficient heating systems that extract free environmental heat by consuming a small amount of energy in the form of electricity.
The heat pump works like an inverted refrigerator, extracting thermal energy from the ambient medium and routing it to the heating system in the building. There, the energy can be used for DHW heating and/or central heating backup. In the private sector, the primary energy sources used are the ambient air, groundwater and geothermal heat.
Since the initial investment is higher for water-to-water heat pumps and brine-to-water heat pumps (also known as a geothermal heat pumps), many building owners opt for air-to-water heat pumps. They have many plus points, particularly in terms of flexible installation. This can be a deciding factor when renovating existing buildings, for example.
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