The non safety-coated borosilicate glass mobile phase reservoir bottles can be heated on a hot plate under certain conditions.
If you are boiling water (100 °C) on a hot plate using this product for example, it will be suitable for this purpose. However, you cannot let the water evaporate completely or the glass may be damaged. Also be sure that you do not add cool water to a bottle that is heating or the glass may crack and the water will spatter. For more details on proper protocols, follow your Standard Operating Procedure (SOP) and obey all laboratory safety practices.
*Please be aware that this article does not apply to safety-coated bottles. These products cannot be heated under any conditions.*