Rapidly developing technology and increasing world population cause changes in people's living standards. On the other hand, while the world's energy resources are decreasing rapidly, the need for energy is constantly increasing. Energy is one of the main expense items for textiles as well as for most sectors. for Turkey's economy, the textile company which has an important place in terms of employment and exports, must adapt to the changing competitive conditions. Therefore, they have to reduce their expenses and especially energy costs. Moreover, 72.6% of which is dependent on foreign energy efficiency in primary energy sources for Turkey is inevitable. A large number of chemicals are used in textile finishing businesses, together with dyestuffs, that significantly determine the character of wastewater. These substances, many of which are environmentally risky, emerge as a problem with wastewater. In the textile industry, there is a wastewater generation between 200 m3 and 350 m3 for 1 ton of product. In this study, by utilizing the heat of the wastewater produced in a real textiles dye in Turkey, the heat energy recovered by heating the entity incoming fresh cold water was investigated. The amount of energy gained and the payback period of the investment are presented with mathematical data, the gains gained have been evaluated and recommendations have been made.