Sustainability and innovation have been key words throughout the 140 year history of A.O. Smith. As the inventor of a patented glass coating process, A.O. Smith knows like no other how to maximize the lifetime and quality of glass lined-steel water heating appliances. Today, A.O. Smith supplies products in many different areas and applications. Through constant innovation, at production level and application level, A.O. Smith maintains its leading position in the market. This applies both to the choice of materials and components used in the manufacturing process, as well as to the efficiency of the finished products.