Thanks for your condolences, I was lucky I only had one fish in the tank. I have 15 year old heaters that are still working, so I hope you are wrong about this being common. You'd think the manufacturer would spend a little more and put in a thermal fuse. The glass was blackened and still hot hours after I unplugged it. I've been slowly replacing my oldest heaters with submersibles, but this one was fairly new.
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