Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lasted three days--then died

The heater looked good and worked well for three days--then it died. I tried to revive it thinking maybe the thermostat--or whatever--inside was stuck, but no luck. Put it in tap water temperature cool water--no luck. Tried different electrical outlet, etc.--no luck.I had it at the bottom of a 30 gallon turtle tank that was full of water, probably 8" deep, and it wasn't buried or anything--so I think the installation was good--it was simply defective. I replaced with a fish tank heater which is still working after a month.