Designed to provide the most comfortable therapy available, the ResMed S8 AutoSet II is simple, quiet and easy to use. One-touch settings and simple set-up make this machine very attractive since the AutoSet algorithm works on a breath per breath basis and automatically adjusts to find the lowest required pressure needed, preventing most snoring and apnea events. Take advantage of EPR and the new Easy-Breathe technology which offers smoother, comfortable pressure by synchronizing with the CPAP user's normal breathing patterns, allowing for natural and stable breathing. Packed with features, ResMed was able to keep sound levels well below the industry norm, operating at 24 db(A).

ResMed has incorporated its expiratory pressure reduction system into the Auto Mode on this unit. A major feature missing from the first version. EPR decreases the pressure at the beginning of each breath and keeps the pressure low throughout the exhalation. The pressure is reduced by an exact pressure drop of: one, two or three centimeters of water pressure. EPR uses slower pressure changes, so there is little ventilatory effect. However, EPR does feel very much like a Bilevel to the patient.

EPR also has an Event Detection Circuit. When a sleep disordered breathing event is expected or has occurred, EPR stops until the event concludes and normal breathing resumes.

The S8 AutoSet II uses Easy-Breathe Technology along with EPR to make breathing more natural with smooth pressure waveforms, which imitates normal respiration and ultimately makes breathing more comfortable than traditional CPAP machines.

Key Product Features


• EPR with Easy-Breathe Technology
• Whisper Quiet Operation (75% quieter)
• Simple Menu
• Optional Heated Humidifier
• S8 Compact Design
• Detailed Downloads with Use of Software
• 12V DC Input
• AutoSet Technology
• Smooth Pressure Delivery

• Pressure 4 to 20 cm H2O
• Ramp Time 0 to 20 min. (5-min. increments)
• Starting Ramp Pressure 4 to CPAP; user adjustable
• Dimensions 4.4” x 6.5” X 5.7” (112mm x 164mm x 145mm)
• Weight 3 lbs
• Filters Pollen
• Device Set-Up LCD/Keypad
• Data Storage Capacity Display: 365 days summary data and 5 nights detailed data (up to 500 events per session. Data Card: 180 days of summary data and 5 nights detailed data (up to 200 events per session)
• Electrical Requirements 100 – 240 V, 50/60 Hz; 110 V, 400 Hz; 2.5A <140 VA (110W)(maximum power consumption). Instantaneous peak power consumption <340VA
• Operating Altitude Sea level to 8500’ (2591 m)
• Humidification Optional Integrated Heated Humidifier or Pass-over Humidifier
• DC Power Only use DC-12 Converter by ResMed for DC input or damage may occur.
• Warranty 2 Year Manufacturer

A ResMed DC-12 Converter For S8 Machines must be used with the 12 volt jack. Any other cable will likely cause a machine failure. You can find this item on our site.

Do not run this machine on a regular AC to DC inverter. A pure sine wave inverter must be used. We sell these on the website.

SmartStart enables your device to start automatically by breathing into the mask. Leak alert indicates when a high mask leak is present.

If you have enabled Leak Alert, the SmartStart feature automatically becomes disabled. You cannot have both features enabled.

All S8 and S8 II CPAP Machines utilize a "Cool Down" feature that runs the CPAP Motor up to 1 hour after turning the machine off. The motor helps to cool off the humidifier plate. You may hear a "faint blowing sound" when you turn the machine off. However, you can unplug the power cord and allow the heater plate to cool without airflow.

The S8 AutoSet II and Elite II are compatible with this product, but the CPAP machines were manufactured BEFORE the H4i was manufactured. When setting either machine, please note that H3i will appear on the display.