The waste water evaporator technology is based on boiling the wastewater. This water, once distilled, is replaced in the production line whereas the contaminant, now very concentrated, can be disposed off at relatively low cost. The product to be distilled is pulled into the evaporator exploiting the depression inside the boiler, generated by the vacuum circuit. The cooling cycle, equipped with a heating pump, is able both to get heat the liquid in treatment and to cool the vapors produced in the boiling phase. Distilled liquid and the processed residue are unloaded at the end of the distillation process. Strong point of this technology is the low running cost of its application. The vacuum distillation, combined with the heat pump technology, allows us to separate the water from the polluted products at a low energy consumption.