A typical hot oil system has an inventory of commercial hot oil that is specific to a temperature/pressure application. This inventory is circulated through either a fired heater, or an electric heater, to provide the required heating medium temperature to the heating application (e.g. reboilers), and is then returned to the hold-tank (e.g. hot oil drum). Filters are typically used to keep solids from degrading the performance of the system and in some applications there may be degradation products of the hot oil itself, which are filtered out.