... , Customized Styles Available Designed for domestic use. Model No.:JTS004. Solar Water Heater Solar Water Heater with Galvanized Steel Bracket, Customized Styles are Available.Designed for ... Key Specifications/Special Features:Vacuum tube specification: 47 x 1,500, 58 x 1,800, and 70 x 2,000mm Amount of vacuum ... tube: 16, 18, 20, 24, 30, and 36 Outer tank ...