There is a story here... so howd it get charred?
Cheese
1) most people fly sparge with hot water, and there has been a small amount of debate but for the most part hot water seems to win.
2) That looks like a lot of deadspace in your mash tun.
3) If that heating element runs without water it will scorch and then die.
Not to bag on your bucket setup, and I know some people have been using them for a while, but an insulated cooler should hold your temps within a degree or two for an hour.
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