This study was aimed to simulate a novel configuration of gasification stove with the natural draft principles (natural draft gasification or called as NDG stove) based on chimney effect and thermochemical equilibrium modeling. The thermochemical equilbrium model used general stoichiometric gasification,methanation and water-gas shift equations and their equilibrium constant equations as well as the general energy balance equation. Those equations were coupled with the chimney effect equation and then solved to obtain the reaction coefficients, equilibrium constants, reaction temperature as well as the mass flow rate of air. Simulation was performed by using VBA programming codes in Excel. Subsequently, a stove was built in order to obtain the charcoal consumption rate data which is required to validate the model. The test results showed that the combustion rate was constant i.e. 8.8 g/min and the quality of the flame of the stove was visually good. The calculation result showed that the model could succesfully predict the product gases including CO, CH4, CO2, O2, N2 and other gases. The simulation showed that by using lower stoveheight (0.5 and 0.4 m) the combustible gases (CO, H2 and CH4) compositions were increased in such a way that with same combustion rate the potential heat of gas increased from 2.33 kW at stove height of 0.6 m to 2.63 kW at 0.4 m.