Broken heater -> Tank Crash in Progress

[Midway]

Well obviously a controller is not gonna stop a heater from exploding or cracking or anything like that. A controller its a really good backup if a heater gets stuck or a heater fails to turn on or stuff, of course the controller will prevent the tank from getting cold if you set it up to send you an email if the temp is falling from what you set it up at. The controller will NOT stop the tank from getting cold, you will prevent it by getting an early warning by the same controller.
I'm not saying that the controller will replace checking your equipment yourself once in a while, making sure everything is working as it should. The controller is a really good level of automation from preventing disaster from happening to a point IMHO.