Instruct: Classify Amazon reviews into positive or negative sentiment
Query: problems with its longevity

I bought this second one in an emergency because the first one i bought the heating element burnt out after 2 months.This one lasted only one week!Both in an outside pond about 10 feet by 4 feet and 2 feet in depth - at temperatures about 10 to 40 degrees fahrenheit.I think it is a lack of control of the heater element temperatureTry a different manufacturer!