More on an electric crock pot for those unfamiliar with them; they come in several sizes, I use a 4 qt for hide glue heating, a much larger one for cooking large batches of deer chili to freeze for later. The settings on them are high, low and warm, you can bring water to a boil quickly on high, let it simmer all night on low or just keep the contents at serving temperature on warm.
I throw the ingredients for chili in mine at 6PM, I set it on low and let it cook all night, usually putting the crock pot on warm when I get up in the morning to hold it until lunch.
This is the largest crock pot available; I think it is a 7 qt one.