Fired heaters are used for process heating applications which heat media is not available or is not hot enough. These heaters can include various types. Helical Coil heaters are used for thermal oil heating, regeneration gas heating and other applications. Convection heaters are used for temperature sensitive applications, intermittent heat applications and other applications which radiant heat transfer is problematic. Bath heaters are used for temperature sensitive applications, always on applications and various applications which the flame must be kept separate from the process by an intermediate fluid.