I have had big problems with Helix. I am not sure if it is just my outlet but it would give me an error message and then turn off. This was after a couple months of me having to set the temps at 110F to get 90F in the tank. Annoying. It "tested" fine with their light bulb test, but somehow couldn't regulate two tubs...it made me VERY angry.
I got rid of it and bought a herpstat.