Quote:
Originally Posted by untamed
Assume that your heater thermostats will eventually fail. Limit your risk by using 2 or more (undersized) heaters. It is extremely unlikely that they will all fail at the same time and failure in one won't be enough to kill your tank.
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There's my advice! That's what I do. I've had one of the two stick on, and it only raised the tank temperature by 2 degrees because it was undersized.