In the context of potable water generation, a discussion on evaporation is essential. For example, the earth’s hydrological cycle itself is sustained by large-scale evaporation from vast water bodies. Evaporation of water from lakes and oceans and subsequent condensation of water vapor in the form of clouds followed by rainfall are essential processes in the water cycle, which are replicated in present-day water distillation units. Evaporation is also an essential mechanism in nature that humidifies the ambient from which potable water can be recovered using atmospheric water generators. The present chapter describes the modeling aspects of evaporation from a body of warm water and its interdependence with the induced heat and mass transport processes, both in water and in the surrounding air. Specific applications of interest are: water desalination, membrane distillation, droplet evaporation over a substrate, and thin film evaporation at an extended meniscus. Additionally, the limitations of these models are outlined, concluding with the need for future research on estimation of evaporation rates coupled with evaporation-induced transport.