this is the heater and controller that i have
http://www.aquacave.com/finnex-deluxe-electronic-brtemperature-controller-1925.html
http://www.aquacave.com/finnex-300w-deluxe-brtitanium-heating-tube-1922.html
its actually two parts which is the titanium heating tube with the heating tube controller similar to a ranco controller.
when i was using it on my display tank i plugged up the controller to my aqua controller junior.(which was not necessary because it is designed as a stand alone temperature controller).. i wanted to get things running on the tank i was setting up so I decided to use the controller for what it was designed to do...i set it up then i left only to return top the coral stew..
when i contacted the company they said it sound like it was due to a faulty circuitboard which allowed it to heat tube to get power although the controller did not activate the heater.......
this was actually bound to happen because i was actually planning to use the heater and controller on my display tank in the future when i went on vacation so i could free up a port/plug on my aquacontroller junior..in other words later on it could have been much worse.