Is this the one that didn't turn off when the water ran low?
		
		
	 
 
Yes.
 
My hunch though is that all these water heaters with a safety auto-off feature to prevent a fire is it's a one-way trip. Meaning, it probably burns some non-replacable fuse and then your device is toast. I suppose I could test the device by dry heating it on concrete or bare dirt, but I'd hate to do that just to "know" it works and have to fork out another $45 (currently $35+$10 shipping on 
Amazon) for a new one.
 
It's COMPLETELY my fault that I let the water get too low. The instructions say not to, but I got lazy and thought, "Well, it will shut off if needed". It hadn't shut off when *I* thought it should (being only partially submerged).
 
In other words, if they made the safety feature work too well, they would get complaints and bad press from folks who have them burn out because they didn't follow instructions. If they removed the safety feature outright, then they would get sued by folks who didn't follow the instructions and rather than own up to the fact that they screwed up, they will want to blame the manufacturer. Yes, I think that manufacturers need to design and sell safe products, but IMO, way too many folks avoid their own responsibility and want to blame someone else.
 
Had the unit failed to shut off at all and it burned down our coops and chickens, wow I would feel just terrible. But I wouldn't sue. It wasn't their fault, but mine. If the thing suddenly exploded and electricuted me, the chickens then started a fire (and I was following instructions), then I might consider a lawsuit.
 
Perhaps these devices should be sold with strict warning on the box label to not let the water get lower than the device and in the very fine print in the instruction booklet a passing mention that it has a safety auto-off feature.
 
I trust this design over some of the others for a couple reasons, 1) It has a cage to keep the heating element from touching anything and 2) It's not encased in aluminum (I have a thing against aluminum touching food or water).