If you're worried about your room heater failing, buy a back up heater.
Flex watt should NEVER exceed recommended temps. To do so is risking a fire hazard. the risk of cold snakes is not worth burning down your building or worse.
Rheostats have no way to protect against shorts that I am aware of..
They are fancy names for dimmer switches.
Flexwatt is not designed nor intended to do what you are planning to do with it.
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