The authors' experience in the modernization of commercial heat exchangers in steam turbine units is discussed with the individual features of the operation of these exchangers at specific thermal power plants taken into account. The variety of conditions under which heat exchanges operate in specific engineering subsystems requires an individualized approach to the model solutions that have been developed for modernizing these systems. New piping systems for commercial heat exchanges have undergone industrial testing and are in successful operation at a wide range of thermal power plants. © 2010 Springer Science+Business Media, Inc.