In this thesis, the heating system of a 180 m2 family house located in Slavonski Brod was designed. According to the architectural foundation, the house consists of a ground floor and a first floor. Emphasis is placed on the heating system with a heat pump and underfloor heating as a heating element. The introductory part briefly explains the basic definitions of heating, and in the further part it states the heat pump as a modern solution that reduces emissions of harmful gases and increases the energy efficiency of the facility. Furthermore, heat losses are calculated according to EN 12831. The rooms are first divided into zones, and then the heat load is calculated for each zone. The temperature regime used is 45/35 °C. By calculating heat losses, final solutions are obtained, after which the necessary equipment is selected, with which the system will compensate the losses. Underfloor heating is installed in the entire family house, and there is a need to install two additional heating elements in the form of bathroom radiators. When choosing equipment, it is necessary to carry out certain calculations, the most important of which is the pressure drop, the calculation of the volume of the expansion tank and the calculation of the volume of the domestic hot water tank. A Vitocal 222-S type heat pump with integrated DHW tank and integrated expansion tank was selected.