Aluminum brew kettle. It looked gross with buildup all over the inside and element. Aluminum oxide is good and bad. Most of you wouldn't brew in it - my guess. But all of that crud stayed in the kettle.
Anyway, great beer has been coming out of it but I don't want to push my luck. I wish I had bought SS instead when I started up again. And I wish I had just power washed it on a hot day in August instead...........