I do have three tubs that are not in a rack that I run on a Ranco thermostat. They are identical tubs with identical sized flexwatt, and each has their own AcurRite thermometer/hygrometer monitoring temps.


I would probably let it run for at least 24 hours to let it heat up properly. But I do that for any new set-up.

These are the tubs run on a Ranco thermostat: