wysiwyg
The 15 thru 17 series tanks were all the same size, but the 18 thru 23 were taller because they added the upper washarm and needed the clearance to still allow tall dishware in the bottom rack and be able to clear the washarm or china guard if so equipped. The commercial units followed right along with the doemstic ones, except that the WM5 tank, which is a 18 derivative, was made in Europe and served as the K/A machines in Europe and Australia. Hobart brought a modified version of that tank here for the commercial market here. Dumbed it down quite a bit for here. We just don't have the features they have on the European machines. Different market and products. Same goes for the other manufacturers as well.