All glass double distillation unit, with quartz heater tube, vertical type water distillation apparatuses distillation apparatuses units are made from low expansion borosilicate glass tubing. The most sensitive part of unit is heater which is made from fused quartz glass tubes. Housing a properties of very high temperature resistance. Borosilicate glass is neutral in its nature produces high purity of distilled water from these units. Description of apparatus these units consist of main boiler. A built in heater enclosed in quartz glass tube. Housing auto water level adjuster, bottom outlet for cleaning waste discharge. A coil condenser fitted on top for condensing vapors. The whole unit is mounted on epoxy coated metal box stand and covered with acrylic sheet cover for protection. These distillation units are more compact, require less space, reliable, easy to operate on continue basis.