The SeaWaterDistiller is working on the well-known vacuum distillation principle. Waste heat from the main engine on board is utilized as heating medium for evaporation. The evaporation takes place in the evaporation plate bundle located in the lower part of the housing. A part of the incoming sea water evaporates due to the high vacuum inside the housing. The generated vapor is cleaned from sea water droplets while flowing through a wire mesh demister.