HUH?   NO canning on a flat glass top?    I'm glad you told me that, we've been canning on ours since 1997 and never had any trouble.   My wife cans a lot, and I mean a lot, both with a pressure cooker and a canner.    I actually think a glass top is BETTER for canning.   Those flimsy electric coils have been known to bend from all the weight of a fully filled pressure cooker.    Gee, my wife isn't going to like it when I tell her she has to quit canning on it.    BTW, it's a Whirlpool.

As to dishwashers, go Bosch, never had any trouble with ours either.