On the apartment block in Fiľakovo, complete reconstruction work was carried out. Part of the energetic measures was also DHW heating. In the apartment block, there are installed 2 units of thermodynamic systems, total 24 panels. Systems are interconnected with the original central heat supplier, which serves as the beack-up power in the season when it is not suitable to operate thermodynamic system. Metering and regulation of both systems ensures central computer, which was part of the work.