Generally, to cook ‘low’ on slow cookers means you are working with around 200 degrees F, or 90 to 100 degrees C and ‘high’ 150 degrees C. In some cases, slow cooker guides will help you to work out equivalent temperatures. Of course, it stands to reason that cooking on low is going to take more time. Personally for most of the recipes that I use I am cooking on ‘low’. I have two slow cookers one is very small and has just an on-off button so – ‘low’, my bigger and newer model has three settings, low, medium and high.