Definitely looks like a burn so I'm guessing you don't have your UTH connected to a thermostat. Unplug your UTH until you get a thermostat to regulate it!
Thermostats are one of the most important pieces of equipment and is not optional. If you're on a budget you can start with a jumpstart:
https://www.amazon.com/gp/aw/d/B000N...art+thermostat
Later you can upgrade to a herpstat- which will be more reliable.
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