Data reported in the literature, both on subcooled flow boiling and falling him evaporation of aqueous solutions containing dissolved solids, indicate that the heat transfer coefficients for the solutions are lower than for pure water, One particular reason for this is likely to be the effect of vapour-liquid equilibrium and interfacial mass transfer on boiling heat transfer. Effects of these two phenomena on boiling of binary liquid mixtures are well documented in the literature. The present paper examines the suitability of an existing model for vapour-liquid equilibrium and mass transfer effects on boiling heat transfer of binary liquid mixtures to boiling of solutions containing dissolved solids. It is observed that some important changes are necessary to apply the model to boiling of salt solutions. An extension of this model to a binary liquid mixture containing dissolved solids is also presented. The predicted results are compared with the experimental measurements reported by other researchers. The comparisons show good agreement between the measured data and predictions, Based on these encouraging results areas of further work are described.