I honestly think you would have been fine with the original UTH, but you might be able to get away with the one you're now stuck with (pun intended) ASSUMING you put some kind of thermostat on there ASAP. Also, just to clarify what Kaorte said, that 90o hot spot should be on the warm side of the tank. If you understood that, feel free to disregard my clarification.
FYI, that whole cold water cracking hot glass thing... yep, it's true. I don't recommend testing it by tossing some hot water on a frosty windshield either. Just sayin'. Glass is actually not a solid, it's a super stable liquid. Like any liquid, it expands and contracts with temperature changes. When the temperature changes too fast, it cracks. Pour some hot tea over ice cubes and you'll get the same effect. And yes, I did just go full nerd.
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