SeaWater Distiller (SWD)

GEA Westfalia Separator SeaWater Distiller (SWD)

Machine Application

The SWD (GEA Westfalia Separator SeaWaterDistiller) is working on the well-known vacuum distillation principle. Waste heat from the main engine on board is utilized as a 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 vapour is cleaned from sea water droplets while flowing through a wire mesh demister. The condensation takes place in the condenser plate bundle located in the upper part of the housing. The condenser is cooled by sea water. The latent heat from condensation is transferred to the sea water. The condensation / evaporation temperature varies with the sea water temperature.

A small portion of the heated sea water is utilized as feed water for the evaporator bundle. The biggest part is used as a driving medium for the combined air- / brine ejector. This ejector has a double function: Extraction of the surplus sea water (so-called brine) out of the housing and vacuum creation by exhaust of the non-condensable gases.

The distillate quality (salinity) is monitored at the control panel. If the salinity exceeds the adjusted set point (2 – 10 ppm) the distillate is rejected back to the evaporator via a solenoid valve.


Standard Equipment:

  • Control panel (built-in on left or right side)
  • Chemical dosing tank (built-in)
  • Distillate pump
  • Set of thermometers and pressure gauges
  • Set of non-return flaps
  • Feed water valve
  • Solenoid valve
  • Water meter
  • Salinity measuring cell + indicator


  • Simple, compact design
  • Distillate pump, control panel, chemical dosing equipment
  • Titanium heat exchanger plates
  • Sea water resistant materials
  • Hinged hood

Models and Specifications

Optional Equipment

Anti-scale chemical dosing unit for feed water
Chlorination Systems
Disinfection UV-Sterilizer
Rehardening Filter (pH adjustment)
Seawater pumps (necessary for operation)
Silver-Ion Sterilizer
Heating Water Unit
and more …

The GEA Westfalia Separator Sea Water Distiller is great for new builds and retro-fit projects. The more compact design (depending on capacity) makes it a great option for replacing those old Alfa Laval JWP Fresh Water Generators, Alfa Laval Nirex Fresh Water Distillers, and/or Sondex Freshwater Distillers.

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