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[APD] heaters--any way to tell when they're going bad?

I have a several fairly new heaters that give me no trouble at all, now, but I'm just wondering for the future--is there any symptom of impending failure that one might look out for, so it could be replaced before it gets stuck "on" and fries your fish?

Just looking for something to worry about, since the algae is pretty tame right now.

Diane Brown in St. Louis
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