Hot water heaters, enamelled: Internal corrosion resistance (NT VVS 017) Posted onJune 25, 1983September 25, 2020Author Report #: NT VVS 017 Approved: June 1983 Download pdf Size: 66.96 KB Abstract This NORDTEST method may be used for the testing and estimation of resistance against corrosion obtained by internal enamelling in hot water heaters made from steel. Categories