The heated tube for DreamStation CPAP machines is the compatible heated tube for use with the DreamStation Heated Humidifier by Philips Respironics. When connected to the humidifier, the heated tube can be set to one of five heat settings, or turned off if desired. When connected to the DreamStation Humidifier, the hose can heat to keep humidified air moist while it travels through the hose. The heated tube can be connected directly to the machine if the humidifier is not being used, however it will not heat. CPAP tubing should be replaced every 6 months.