Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lasted 22 months

Thermostat eventually broke on my unit & unfortunately we didn't catch it in till it took a couple fish with it. Temp was set at 77 degrees but unit heated the tank to 84! Tried lowering the gauge but got the same results. Bought this over other models in hopes it would be long lasting & dependable but it's going to the garbage can.