The present study addresses the ongoing issue of efficient energy utilisation and fuel consumption reduction in boiler plants. The achievement of these objectives is facilitated by the development of technologies that maximise the utilisation of flue gas heat. The solution to this problem is proposed in the form of a technological scheme for a gas-fired boiler plant. This scheme is designed to facilitate the efficient and economical deep utilisation of flue gas heat. The utilisation of a column of contact action consisting of prefabricated reinforced concrete elements is proposed as a solution to the issue. Prefabricated heat exchangers manufactured from reinforced concrete offer a few significant advantages in comparison with their steel counterparts. The reliability of such heat exchangers is well documented, as is their longevity. In addition, they have been shown to reduce metal consumption during production. Furthermore, the present study undertakes an analysis of the characteristics of combustion products and moist air, in addition to the features of heat transfer in boilers, economisers and calorifiers. The objective of this study is to demonstrate the relationship between the properties of combustion products and moist air, on the one hand, and thermodynamic processes, on the other. The relationship between the two areas of study is illustrated by analysing i,d-diagrams, which provide a visual representation of the relationship between these two areas of study. A thorough investigation into the diverse methodologies employed for the utilisation of heat generated during the process of natural gas combustion has been conducted. To enhance the energy and resource efficiency of thermal equipment operation, it is proposed that programmable controllers be introduced as a controlling element of automated boiler plants. In addition, the utilisation of wireless data transmission and reception systems, in accordance with contemporary technologies, via secure communication channels, is also recommended. The creation of a monitoring and dispatching system is accomplished through the utilisation of domestic components.