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The paper deals with the description of the control circuit of the power plant output superheater. Presented control circuit is modeled based on documentation provided by a power plant operator. Its verification is done through testing the mathematical model with real measured operational data. Output power plant superheater is described by a set of partial differential equations of the first order. These equations describe heat exchange between media through a wall with unspecified proportions. Equations are assigned into Simulink S-functions. The Simulink models act as mathematical model of the set consisting of the heat exchangers, on which the experiments are carried out. Actuating device of the regulating circuit is mathematical model of the injection water/steam which keeps the required temperature of the steam at the superheater output. This injection is also implemented as S-function in Simulink.