The relevance of this article stems from the situation in the energy sector. For issues of a more efficient use of the thermal capacity of industrial wastewater this article describes the method of determining the efficiency of heat utilization of industrial wastewaters produced during the implementation of thermal processes of service enterprises, as secondary energy. Conducted system analysis of the technological regime cards washing clothes in order to identify the energy potential of wastewater. Based on the analysis of the conditions of production of thermal equipment is composed of a heat balance, thermal process equipment, the methods of determining the heat capacity of industrial wastewater and the amount of saved fuel by use of this energy potential. As the calculation of the financial cost of additional heat exchanger regenerative type, the use of which allows to implement a system of heat utilization of industrial waste water as the heating fluid.

Keywords: Energy efficiency, heat balance, energy, vapor, liquid, sewage, heat capacity.