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ResMed VPAP™ ST with H4i™ Humidifier
Model: 26122

ResMed VPAP™ ST with H4i™  Humidifier
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For Reference Only
Available Options:

Extended Warranty:  

ResMed VPAP ST with H4i Humidifier Review

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Key Features & Reviewers Tip
How to? Connecting & Setup
FAQ Comparison, Troubleshooting & Compatibility
Available Accessories

Therapeutic VPAP Machine for Patients with Severe Sleep Apnea

The ResMed VPAP ST with the H4i humidifier is intended for patients who need a VPAP machine with a high pressure setting. With an operating pressure that can be set as high as 25 cm H20, the S8 ST is perfect for patients with chronic and debilitating sleep apnea. The device comes with leak detection software and will monitor every breath to ensure that you're getting the therapy you need.

Monitors Every Breath

ResMed's EasyBreathe technology monitors every single one of your breath's while you're using your VPAP. EasyBreathe uses new software to help synchronize your respiratory cycle with the machine's pressure for a more natural breathing experience.

Quiet VPAP

The VPAP ST is one of the quietest sleep apnea therapy machines on the market. It uses a dual-fan motor that runs at a lower RPM than other machines; by using two fans, neither fan has to work too hard, which keeps the device quiet. A full 75% quieter than competing machines, the ST is silent, which will help you and your partner fall asleep faster and ensure that you're getting the best therapy possible.

H4i Humidifier

The HumidAire H4i Heated Humidifier delivers 30% more humidification than the previous H3i model. The H4i is compatible with all S8 ResMed machines, including the VPAP ST. The chamber is also bigger than the H3i, and now can hold 390 ml of water. The H4i will help relieve certain symptoms commonly associated with CPAP therapy, including dryness of the nose and throat, nasal congestion, and rainout. Get a better night of sleep and therapy with the H4i Heated Humidifier.

Automatic Leak Adjustments

ResMed's Vsync leak management system automatically adjusts the machine's pressure when the algorithm detects a leak. Even if your mask slips off, the increase in pressure will compromise for the leak event, ensuring that you get the therapy you need all night long.

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Key Features

Ergonomic Design
Built in Data Tracking for 365 Days
Small and Portable

Reviewers Tip:

VPAP machines are for patients with severe sleep apnea only: VPAP's have higher pressure settings, and are not intended for everybody.

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ResMed S8 AutoSet Feature

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Does this come with a heated tube?

No, standard tubes only for S8 ResMed models.

Can I use one of ResMed's new H5i humidifiers?

The S8 VPAP is compatible only with the H4i.

Can I run the water chamber in my dishwasher?

Yes, the chamber is dishwasher safe.


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Available Accessories

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No Refunds, Returns or Exchanges on Open Products Except for Warranty Issues or Mask Assurance

HCPCS CPAP Code(s): E0471 (VPAP), E0562(humidifier)

Product Specifications

ST, T and S Modes:

IPAP 4 to 25 cm H2O; EPAP 3 to 25 cm H2O

VAuto mode:

4 to 25 cm H2O, (Pressure support: 0 to 10 cm H2O)

Operating Pressure Ranges:

3 to 25 cm H2O

Maximum Single Fault Pressure:

30 cm H2O

CPAP Mode Pressure:

4 to 20 cm H2O

Sound pressure level:

< 26 dB (tested in accordance with the requirements of ISO 17510-1:2002)

Ramp Time :

0 to 45 min. (5-min. increments)

Starting Ramp Pressure:

4 to APAP/CPAP Pressure

VPAP Dimensions:

4.4" L x 6.5" W x 5.7" H, (112 mm x 164 mm x 145 mm)


2.9 lb (1.3 kg)

Sound pressure level (CPAP mode):

24 dBA with uncertainty of 2 dBA as measured according to ISO 17510-1:2002

Air outlet:

The 22 mm conical air outlet complies with ISO 5356-1

Standard Filters:

Polyester fiber



Data Storage:

Data includes usage, leak, pressure, AHI, AI, tidal volume, respiratory rate and minute ventilation

Data Via LCD menu:

365 sessions of summary data

Data Via ResLink:

365 sessions of summary data, 30 sessions of detailed data

Data Via ResScan Data Card:

180 sessions of summary data, two sessions of detailed data

Supplemental Oxygen:

Recommended maximum supplemental oxygen flow: 15 L/min

Operating Temperature:

Temperature 41F to 97F (+5C to +35C)
Humidity 10-95%, non-condensing
Altitude sea level to 8,500 (2,591 m)

Pressure Relief on Exhale:


90W Power Supply Unit:

Input range 100-240V, 50-60Hz, 70W (80VA) (typical power consumption), >100VA (maximum power consumption)


Integrated H4i Humidifier


2-Year Manufacturer Warranty

DC Power:

Use only the supplied DC-12 Converter by ResMed for DC input or damage may occur and warranty voided.

Package Contents

  • S8 VPAP ST Machine
  • H4i Heated Humidifier
  • 6' 6" (2 meters) - 22mm Hose
  • 2 Air Filters
  • Carrying Bag
  • User Manual