Electrically Operated.(Improved Model) Double Walled: Inner and outer body and Boiling Condenser also Made of Stainless Steel. (a) This method of producing and storing distilled water is designed specially to meet the needs of the Modern Hospital and Laboratory Research. To work on 220 Volts A.C supply with 3 core wire and plug (without rubber tubing). (b) Available cap. From 2 litre to 20 litres