The Nusselt theory of laminar film condensation and evaporation is show significantly underpredict existing experimental data because of the presence of waves or liquid-vapor interface. A heat transfer model is presented which incorporates the results previously developed hydrodynamic wavy-film model (Part I). Results based on the mode both local and mean Nusselt numbers are shown to be consistent with available data, and to satisfactory account for the deviation of the data from the classical Nusselt theory.