Domestic hot water boilers are constructed from different materials for different applications: AISI 316 stainless steel, vitrified steel, galvanized steel, or coated internally with a special organic paint called "Bluetech." The SV E 1700 is a special project created for a large company in Doha: these electric water heaters feature three 12 kW heating elements, internally coated with Bluetech treatment, an electrical control panel, and removable flexible polyurethane insulation with a gray PVC exterior.