Thermal ignition of flammable gaseous mixtures from a hot surface is a major concern for a wide range of industrial activities. When homogeneous hydrocarbon fuel/oxidizer mixtures are heated in a closed vessel from room temperature to around the autoignition temperature the mixture can undergo either a slow reaction or an ignition if heat is allowed to transfer to the surroundings. Experiments and simulations using detailed chemical mechanism have shown that this behavior is a function of the heating rate, the initial composition, and the initial pressure. The present study aims at developing a one-step reaction model which captures the transition from slow to fast reaction for a wide range of conditions. In particular, the one-step model includes the effects of pressure and changes in initial composition. Such a model could be included in multi-dimensional simulations to investigate the risk of hot surface ignition under complex industrial configurations.