i have had a few failures but one i have had for over 11 years, and its just a cheap walmart brand chinese junk.
Im trying a stealth and so far its had no problems.
I have heard that heater cables have almost no failure, the type people used to use alot in planted tanks, the only part that can fail is the thermostat and since you use a dedicated thermostat to control the heater cables you get high quality on both.
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