WATER STILL, plated steel, construction, 750W,240V AC. 4lt/4 hour capacity,boil dry protection. Removes poisonous chemicals, solids and contaminants.Simple to operate unit. To obtain distilled water for the classroom takeof the lid and add normal tap water and boil it to create large amounts of steam. Then cool the steam so that it condenses and returns to its liquid state. Any impurities that were in the tap water are now left behind inside the boiling vessel and only the pure water has been carried over into your receiving vessel and you have obtained distilled water. The Ph of the water should be 7.0pH, but after a few hours it will absorb carbon dioxide and change to 5.8-6.0 ph. You will find that it tastes very bland and it has none of the "character" of drinking water because all the usual minerals and dissolved gases are now removed. The unit contains an electric fan in the lid that draws in air at room temperature and blows it over and through hundreds of cooling fins on a stainless steel pipe. As steam passes through this air cooled pipe, it condenses inside the pipe and dribbles from the end of the pipe into your container. It does not waste any water at all. When it has evaporated all its water, it turns itself OFF and the indicator lamp is extinguished to advise the user. The stainless steel container is seamless and has no holes and cannot leak water.The heating element is under the tank and cannot contact the water.The time taken to get the water to boiling point varies as to how much water is placed in the container to boil. Dimmensions Approx 350mm H x 200mm W