The thesis deals with the reconstruction of the heating system for a family house after complete overcladding. The first part is dedicated to an introduction of the subject under consideration. The next step is the calculation of heat loss.. A suitable method of insulation including economical recovery was designed according to the research of potential insulation materials, then heat loss were re-calculated. Another point is to determine a suitable temperature gradient and select the most appropriate source of heat and hot water preparation. The pressure loss circuit through the various radiators were calculated and balanced by thermostatic radiator valves. Finally, the insurance elements of the heating system were checked and the drawings documentation were prepared.