Low pressure distillation plant.

The design comprises sealed evaporation chamber with heating coil and feed inlet port, concentrated liquid outlet port and vapour outlet port. Vapour outlet communicates with vapour entrainment device with rotating impeller pump, situated within distillate tank where vapour condenses releasing heat. This is used to assist vapourisation in evaporation chamber by the use of the heat pump system. Shear tube in the inlet of the impeller prevents pre-swirl of distillate and entrained gas and vapour.