I refuse to run a heater without a controller to monitor the temp, and as an added redundancy my chiller is running on its own settings. That way it requires 2 system failures. As well as replacing heaters every year to make sure they are in as good condition as possible.
I also use 2 glass thermometers, one in display, one I. Sump, and I have a digital temp gauge so that I can check tank temp on controller plus 3 separate thermometers.
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Cheers
Gary
604-319-0317
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