NutriBullet recommends caution when using hot liquids in their blenders. While some models may be able to handle warm ingredients, using boiling or very hot liquids can pose a risk. The heat can create steam pressure inside the cup, leading to leaks or spills when the lid is removed. If you do decide to blend hot liquids, it is advisable to allow them to cool slightly first and to avoid filling the cup beyond the maximum fill line. It is also a good idea to vent the lid slightly to allow steam to escape safely. For the most accurate guidance, it is always best to consult the user manual that accompanies your specific NutriBullet model. This will provide you with the best practices for safe and effective use.