Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bought Two from Amazon, Did Not Work for Me

Like the last review said, some work some don't. Apparently the two I went through didn't work. No temperature change and it wasn't warm at all. This was for a 2.5 Gallon Bowl by the way.Amazon was nice and processed the refund for me no problem. I do not recommend this heater and you should pay $2 more for the other ones.