The one I have works, but I wouldnt leave it on.. About a DAY is long enough. It doesnt overheat the honey, but I honestly think it would if I left it longer. I put it on the bottom 1/3rd of the barrel so the honey will circulate a little, and it does. The one I have (barrel heater) is older but still works.. I can put my hand on it after a night of being left on so I have some confidence in it.. I have felt some newer ones I could not keep my hand in place after an hour. I like warmth not outright HEAT, but thats a personal thing.. I've been told the newer ones work just fine in less time..