Abstract: The device is designed for production of light, highly pure water with a high content of light molecules 1H2 16O. The technical results are productivity increasIIITII of the device and a reduction in energy costs per unit of the finished product. The device is equipped with a heat pump, the distillation column consists of two coaxial tubes of diameter D1 and D2 with a layer of random packing located in the gap between them, where (D1?D2)/2<300 mm, and the liquid distributor at the top of the column has at least 800 irrigation points per square meter of the cross-sectional area of the packing part of the column.