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A dynamic model of a drum-type electric utility boiler, which is suitable for use in designing and evaluating a multivariable controller, is described. State-space matrix equations are used in making the model. Unique iterative methods are developed for obtaining accurate steady-state profiles of the superheater and waterwall sections. Constants for the dynamic model are derived using these profiles. An original superheater model provides the transient response of steam temperature, pressure, enthalpy, and mass flow rate.