Quartz sub-boiling distiller is a fully enclosed quartz glass instrument for preparing high-purity reagents and high-purity water. It has unique advantages. Its advanced technology, novel and beautiful structure, easy installation and operation, and easy maintenance. Quartz sub-boiling distillation uses the principle of heat radiation to keep the liquid phase temperature lower than the boiling point temperature to evaporate and condense to prepare high-purity water and high-purity reagents. The general quartz distiller, due to boiling distillation, entrained water droplets in the gas, incomplete gas-liquid separation, resulting in low water quality; all-glass distiller, because of the pollution contained in the glass itself, the water quality is worse; ion-exchanged water, The dissolution of organic matter brings in the interference of organic matter. The quartz sub-boiling water distiller not only avoids the pollution of glass impurities, but also because the liquid phase temperature is lower than the boiling point. Will not entrain water droplets in the steam due to boiling. Both gas-liquid separation is complete. Therefore, the water quality is extremely high, and no heavy metals are detected by flameless atomic absorption analysis.