A new plant boiler simulator was made to help control design and experiments without costly real or lab-boiler tests. The simulator model was created using a mix of basic principles and different modeling methods for subsystems, with real plant data to check accuracy. The data included steam flow, feed-water flow, temperature, and heat input for starting up the plant. The simulated drum-level and pressure responses matched the actual plant's values well, despite the challenges of the complex boiler behavior and uncertainties, plus measurement problems in industrial settings.