I am disappointed with this heater

I am disappointed with this heater! I was expecting it to work better than it does considering the good reviews I read for it. I liked the fact that I could control the temp for my needs. I bought it for brewing my Kombucha in my one gallon jar and according to the back of the box it is suppose to heat to certain temps according to what setting you use. Regardless of what setting I put it on it keeps my Kombucha pretty much at a steady 77 degree's. I guess I should of gone with a cheaper one that comes with only one setting! :-(

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