My house of the year 2024 already has a hot water tank that is using a heat pump to extract the heat from the ventilation air before it is sent out of the house

My house of the year 2024 already has a hot water tank that is using a heat pump to extract the heat from the ventilation air before it is sent out of the house. When you live in a cold climate this makes tons of sense. Cold air enters the house, gets heated up to 22°C by a heat pump, circulates through the house, then gets drawn into the ventilation system where it is cooled back down to around 2 °C before going out of the house, and the extracted heat is upgraded to 60°C hot water. There is an electric heater taking the water further up in temp. Our system is a retrofit, it draws around 1.2 kW peak and only provides hot water. For new builds, the bigger units drawing ~4kW peak are used, which provide both hot tap water and subfloor heating by water circulation.