jerseyboy

So I just got a brandnew stainless All-Clad set and I am very eager to use it. However I find that whenever I go to boil water in my saucepan or stock pot, the bottom of the inside becomes discolored. I went to the All-Clad website where they recommended Bar Keepers friend to clean it and that did the trick. I also decided to use a lower heat, but the same thing happened, plus it took forever for the water to get boiling. Does anyone know why this keeps happening? I am using an electric stove (shitty college apartment) by the way.