Personally, everyone I know who has purchased a "Round top" (ESU, Alife etc.) thermostat has had it fail in one way or another. It can go either way, kick off and stay off (freeze your animal) or kick on and stay on (Cook your animal).


I have a few rancos and have not had any trouble with them. I have heard an increasing number people who have had trouble with them. I am thinking of switching to Johnson Controls or Herpstat.

I have never heard of a Herpstat failing.