You should avoid using hot liquids in your blender unless the blender has a heating function. If your blender can make hot soups you can use hot liquids inside the blender. If you plan to make something such as coffee smoothie drink you should refrigerate the hot coffee prior to creating your drink. If you use a hot liquid in a blender that is not equipped properly it can melt the blender jar or the gaskets that connect the base to the jar. This can create huge leaky messes. If you plan to use a hot liquid in your blender make sure to check the manufacturer recommendations before purchase.