Supreme solar 220 ltr glass, Lined coated, Is far superior in technology to safeguard the tank from harsh water conditions. Since solar tanks are the ones that will get damaged due to bad It is, Water conditions recommended to buy this model. Glass line supreme solar 220 ltr is a special coating that prevents rusting of tanks due to harsh hard water conditions. We at supreme solar also manufacture solar tanks with an outer body stainless steel finish. What is glassline coating? click, Tank, Is, Better glass lining is a material made by fusing powdered glass to the inner exterior of the metal tank by firing between 850 c to 870 c. Molecular interaction produces a coating that melts flows and then hardens to a smooth, Durable glass coating on the metal surface. So that glass and steel can not be separated from each other. Glass lining provides superior longevity to a hot water tank. In certain areascrafted with durable stainless steel tanks tend to fail more rapidly than glass, Lined tanks due to chlorides in the water, And hence this Solar-powered water heating system is much more advisable than the normal either stainless steel or copper solar tanks.