The ResMed S9 90 Watt Power Supply is the standard replacement power supply for ResMed S9 CPAP devices used with the ResMed H5i heated humidifier.
Please note that this is the standard 90 Watt power supply that is included with ALL ResMed CPAP machines, even machines that do not include a ResMed H5i heated humidifier. There is a smaller 30 Watt power supply available separately that can be used with S9 devices without the H5i humidifier. The smaller 30W power supply is about 3/4 the weight of the 90W power supply, and is 2.5 inches shorter than the 90W power supply. The smaller size makes it a little more convenient for traveling.
Call us at 1-888-955-2727 or email us if you have any questions about power options for your CPAP machine.