A samovar is usually made of metal (some decorative samovars are made of other materials) and has an electric heating element. A spout near the bottom of the samovar releases boiling water. Samovars are so typical in Russia that even trains offer water for tea kept hot by a samovar.
Read more about samovars in Russian culture and the history of samovars in Russia: Samovars.
Learn more about Russian tea culture.