Makeup Water Storage Tank Manufacturer In Germany: DIN, TÜV And Precision Production Standards German buyers are known for documentation discipline and precision, and a manufacturer supplying a makeup water storage tank to Germany is judged as much on paper as on steel. DIN and EN standards, TÜV-style verification, and potable compliance (TrinkwV and DVGW) set the bar; a supplier that cannot produce a clean, traceable file will not clear German acceptance regardless of price.