... electrical heating system for auxiliary heating. 5) Automatically intelligent control and management all day.Specifications: 1) Water tank (interior): Porcelain enamel 2 ... 4) Water capacity: 100L, 150L, 200L, 250L, 300L, 350L, 400L, 450L, 500L 5) Pressure: 6 bar China Domestic Split Pressurized Solar Hot Water Tanks