The paper presents a generalized approach for the flow distribution analysis of a natural circulation boiler. The model uses the combination of node and loop equations and the Newton Raphson technique for the solution of the set of equations. Loop equations have been developed for each evaporator tube with the unique driving force and pressure drop of the concerned loop. Node equations are mainly developed for common risers and downcomers. A unique connectivity matrix has been used to correlate each branch flow with loop and node equations. The model is validated by a unique indirect method by comparing the actual water level and calculated water level. The model shows good agreement with experimental data with a maximum of 4% absolute error. The model can be used for the design, analysis, and optimization of the natural circulation network.