A Nespresso coffee machine with an average water tank has a tank between 0.8 and 1.2L. You can make about 9 lungos in a row without filling the water tank. This is useful if you live with a few coffee drinkers. The Nespresso size is average, so no too small or too big. You can choose from the Nespresso Citiz, Citiz and Milk, or the Nespresso Lattissima series.