Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Heat retention

I use for coffee and the coffee cools down quite a bit after 2 hours. I tried the instructions to preheat the pot with hot water but with the same effect. My previous carafe before the bottom fell off was a Cuisinart which kept the coffee hot for 7 hours. So I'll donate this Copco to a charity and try a different carafe!!!