A state space model of an end-fired furnace was§developed in which the furnace was divided§longitudinally into two zones. Zone 1 contains the§burner flame cylinder , while Zone 2 is beyond the§end of the flame cylinder. Separate states are§identified for the temperatures of the refractory in§the crown, the walls above the glass melt, the walls§adjacent to the two primary melt zones, and the floor§of the furnace. The furnace ends are also divided§into similar zones constituting discrete states. The§glass melt itself contains a thin, surface layer and§two thicker layers of stratification. In all, 24§state variables are included in the model. The inputs§are the net thermal power provided by the flame and§the ambient temperature. Simulations were performed§in Simulink and Matlab and were used to predict the§temperatures of all 24 state variables. The results§were verified using data collected from a similar§tank furnace at Fenton Art Glass Company. The results§showed a significant stratification in the vertical§axis of the furnace but very nearly uniform§temperatures in the length and width directions. The§model was used to study various melting strategies.