A samovar heats water in the lower body — over charcoal or with an electric element — while tea steeps in the pot on top. Copper holds heat for a long time, so the tea stays hot for hours. In double Turkish teapot sets the larger lower vessel holds water and the smaller upper one the tea; both are tin-lined inside.
For a household, 1.5 to 3 litres is enough: three litres brews roughly 20–25 slim Turkish tea glasses. Choose 5 litres for a large family or regular guests, and 7–10 litres for cafés, restaurants and weddings. The stated size is the lower water reservoir; the teapot is separate.
Stovetop models work on any hob; induction requires a steel disc under the base. On samovars with a tap, the washer hardens over time — replacing it once a year prevents drips. Limescale dissolves in a water-and-vinegar mix. Never wash in a dishwasher; wipe the outside by hand and dry it.