The ground source heat pump recovers heat from the earth which is about 3°C (temperature of the collector circuit fluid +2...+15°C). Compressor technology is used to increase the temperature to 100°C. When the temperature reaches 100°C, heat is transferred through the heat exchangers to the hot water storage tank.

In Lämpöässä V and T models, heat is transferred to the storage tank in 2 stages using a separate superheat exchanger and condenser. The upper part of the storage tank is heated with the superheat exchanger and the lower part with the condenser. Given the 2-stage heat recovery, there is better COP (coefficient of performance) and an excellent volume of DHW.

The most popular Lämpöässä ground source heat pumps are monovalent (electrical immersion not used) and comprise superheat technology. This ensures that there is a sufficient volume of economically produced DHW.