I use a method much like that suggest by untamed. I use a controller to control the heaters (as the control within the heater will certainly stick sooner or later). I also use a number of smaller heaters on a power bar controlled by the controller. I set each of the heats to a temperature of 1 to 2 degrees above the temperature of the controller. Thus if the controller happened to stick the maximum the heater would increase the heat is by the difference in the settings. If on the other hand a heater control sticks the controller will shut off the power to the heater at the set temperature.
Tom R
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