The aim of the bachelor thesis is the design of heating and hot water heating for an apartment building in Brno. The theoretical part of this thesis analyzes the principle of condensation and its effectiveness with regard to the conditions during which condensation takes place. It also deals with gas condensing boilers and their operation and efficiency in various connection methods. In this regard, it also solves different connections for hot water preparation and compares individual methods with each other. The conclusion of the theoretical part focuses on flue gas extraction and its effectiveness with regard to operation in the heating season and beyond. The calculation part documents the design and calculation of heat losses of the spec...