From today's Washington Post:
· If they're newer, they're hotter. Because of food safety concerns, slow cookers today heat up faster and cook at higher temperatures than ones bought a decade or more ago. Andrew Schloss, author of "Art of the Slow Cooker" (Chronicle, 2008), found that low settings on newer cookers reach 185 to 200 degrees, while the high setting heats at 250 to 300 degrees. Settings on older machines generally are 15 to 20 degrees lower, and the machines heat up more slowly. If you have an older slow cooker cookbook and a new machine (or vice versa), you will have to adjust the timing in your recipes.
Does your Crockpot have a warm setting?