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HumidAire 2i™ Heated Humidifier

BY ResMed  |  Item #30902
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Item # 30902

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How to Clean and Maintain your CPAP Equipment
Rainout, Causes & Solutions
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HumidAire 2i™ Heated Humidifier

Heated humidification can improve your sleep therapy. The HumidAire 2i Heated Humidifier uses warm, moist air to provide relief from congestion and soothe your sinuses and any nasal dryness.

Learn More About the HumidAire 2i Heated Humidifier:

  • User–Friendly and Easy to Attach and Remove for On–the–Go Use
  • Compatible With Multiple CPAP Machine Models
  • Helps Relieve Symptoms of Congestion and Nasal Irritation

HumidAire 2i™ Heated Humidifier

Heated humidification can improve your sleep therapy. The HumidAire 2i Heated Humidifier uses warm, moist air to provide relief from congestion and soothe your sinuses and any nasal dryness.

Learn More About the HumidAire 2i Heated Humidifier:

  • User–Friendly and Easy to Attach and Remove for On–the–Go Use
  • Compatible With Multiple CPAP Machine Models
  • Helps Relieve Symptoms of Congestion and Nasal Irritation

The HumidAire 2i™ Heated Humidifier is Right for You!

Product Highlight Included Parts Placeholder

What's included*

  • Humidifier
  • Chamber

* Does not include select added accessories

Learn More About This Product

User–Friendly and Easy to Attach and Remove for On–the–Go Use

This device is convenient to use since it’s powered by your CPAP machine and is easy to attach and detach to suit your sleep therapy requirements. 

Compatible With Multiple CPAP Machine Models

The HumidAire 2i is compatible with the following machines:

  • AutoSet CS 2
  • S7 AutoSet Spirit
  • S7 Lightweight
  • S7 Elite
  • VPAP III Series
  • VPAP III ST-A with QuickNav
  • VPAP Adapt SV
  • VPAP Malibu

What’s Included:

  • Humidifier 
  • Chamber

Type of Protection Against Electric Shock: Class II Type CF (double insulation)

Maximum Fill Level Tips

  • Do not fill the water tank above the maximum fill line. Damage to the humidifier or therapy device may occur. If the water tank is overfilled, water may leak out of the tank inlet (located on the back of the tank) when installing the tank lid.
  • Use only room temperature distilled water in the tank. Do not put any chemicals or additives into the water. Possible airway irritation or damage to the water tank may result.
  • Remove the tank, empty all water, and replace the empty tank before transporting the humidifier base.
  • Do not attempt to fill the water tank while it is inside the humidifier.
  • To avoid spilling, do not disconnect the humidifier from the therapy device with water in the tank. Remove the water tank from the humidifier before disconnecting the therapy device.
  • Do not turn the humidifier on without the water tank installed. The Humidifier number setting must remain on 0 if there is no water in the water tank.
  • The humidifier door must be set in the open position before removing the water tank. Do not remove the water tank without making sure that the humidifier door locks into the open position.
  • Do not move the humidifier while the water tank has water in it.

What is a heated humidifier?
A heated humidifier uses heat to warm the water to add moisture to the airstream. The heat is adjustable for more or less moisture. A heated humidifier water chamber is much smaller than a passover humidifier water chamber.

In our experience, it is common for CPAP users to report that their therapy is greatly enhanced by the use of a heated humidifier.

There are three types of heated humidifiers:

What is a passover humidifier?
A passover humidifier uses a chamber of room temperature water with the CPAP to add moisture to the airflow and reduce irritation to the nasal passages.

Air flows from the CPAP through a short hose to the humidifier chamber where the air "passes over" the water to pick up whatever moisture it can. The air then flows into the six foot hose to the mask.

Passover humidifiers may provide sufficient moisture with CPAPs set at lower-end pressures. However, if the moisture is not sufficient there is no way to increase the amount of moisture added. The water is room temperature. In cold climates, the water temperature will drop causing the CPAP air to become very cold, and causing the amount of moisture to be reduced.
What is an integrated humidifier?
An integrated humidifier is used with a specific CPAP and fits directly onto the machine. For most heated humidifiers, this design eliminates the need for a second hose as well as a second power cord.

An advantage of an integrated humidifier is that it works very closely with the CPAP machine to deliver humidification. Also, an integrated humidifier is a compact unit that uses fewer parts to provide moisture to the user.

A disadvantage of the integrated humidifier is the user will receive less moisture when it is used with a passover humidifier. The smaller surface area effects the amount of moisture produced. Also, a integrated humidifier will only function with the CPAP for which it was designed.

You can see if your machine has an integrated humidifier option by reviewing our Compare Charts.

An example of an integrated humidifier is the PR System One Heated Humidifier as seen below attached to a machine in the PR System One line. PR System One Heated Humidifier

Here are some of the integrated humidifiers we carry:

DreamStation Heated Humidifier
Transcend Heated Humidifier
IntelliPAP 2 Heated Humidifier with Pulse Dose Humidification
PR System One 60 Series Heated Tube Humidifier with Heated Tube
What is a built in humidifier?
A "built in" humidifier is designed as a part of the CPAP machine and cannot be removed or separated from the CPAP machine. As with an integrated humidifier, the design eliminates the need for a second hose or power cord. The water chamber can be removed for cleaning or replacement purposes.

The advantage of a "built-in" humidifier is its compact shape, which operates on fewer parts. This integrated design helps to ensure optimum moisturized comfort and effectiveness when CPAP therapy and humidification are used together. Also, it allows an option for the humidification to be turned off while the CPAP is blowing.

A disadvantage is that a built in humidifier may produce less moisture if used as passover because the surface area is typically smaller. Also, since the humidifier is "built in" to the machine, detaching it is not an option. This can be an issue for frequent travelers. Lastly, if the machine or humidifier stops working, the entire unit must be sent in for repair or replacement, not just the component that failed.

An example of a machine with a built in humidifier is the ICON Auto CPAP Machine with Built In Heated Humidifier and SensAwake as seen below. ICON Auto CPAP Machine with Built In Heated Humidifier and SensAwake
Here are some other machines we carry with built-in humidifiers:

AirSense™ 10 CPAP Machine with HumidAir™ Heated Humidifier
AirSense™ 10 AutoSet CPAP Machine with HumidAir™ Heated Humidifier
iCH Auto CPAP Machine with PVA and Built-In Heated Humidifier
+ See More
What is a stand alone humidifier?
A stand alone humidifier is a component that will work with any CPAP and does not attach directly to the machine. It has its own power cord and a short hose to connect it to the CPAP. Generally it will sit next to the CPAP machine and is slightly larger than an integrated humidifier.

The advantage of a stand alone humidifier is the fact that it may be used with any CPAP machine.

The main disadvantages are that the size is often larger than either a "built in" or integrated humidifier and that a short hose is needed to connect it to the CPAP machine.

An example of a stand alone humidifier is the Fisher & Paykel HC150 Heated Humidifier as seen below. HC150 Heated Humidifier
What is rainout?
Rainout is the accumulation of water in a CPAP tube due to warm moist air cooling and condensing on its way from your CPAP machine to your CPAP mask.

The image below from Fisher & Paykel explains how rainout is formed. Warm, moist air leaves the heated humidifier and travels through the CPAP tube. As air flows through the tube, the temperature of the room causes the tube to cool. As the tube cools, the air inside releases its moisture, and creates condensation in the hose.

Solutions to rainout include:
  • Raise the temperature of your bedroom.
  • Keep your CPAP machine at the same level as your bed.
  • Insulate your tubing with a hose cover like Snugglehose.
  • Reduce the temperature setting on your heated humidifier.
  • Purchase a CPAP machine with a rainout reduction comfort feature.
  • Some machine systems offer a compatible heated CPAP hose which maintains the temperature from the machine all the way to the mask, reducing the occurrence of rainout. The list of available heated hoses can be found here: Hoses With Heating Coils.
  • If your machines uses a standard hose, consider the Hybernite Heated Rainout Control System.


Conventional Humidification
How do I care for my humidifier?

To care for your humidifier simply empty and clean the water tank each morning. Only distilled water should be used in the humidifier to avoid mineral deposit build up. S9 Dishwasher Safe Humidifier Chamber

Here are some items that can help with caring for your humidifier:


CleanSmart CPAP Disinfectant Spray

Control III Disinfectant CPAP Cleaning Solution - 16 oz Concentrate

Control III Disinfectant CPAP Cleaning Solution - Home Care Kit

Hurricane CPAP Equipment Dryer

Why do I need to use distilled water with in my humidifier chamber?
Use distilled water to help keep the humidifier chamber clean and mineral deposit free. Tap water should not be used as it will leave hard white mineral deposits in the chamber as the water evaporates, or it may lead to mold growth. Cases of lung disease have been connected to using contaminated well water in a CPAP humidifier.* Source

If distilled water is not available where you live, use bottled water. It will be important to clean the chamber each morning, do not leave standing water in the chamber between uses.
What does a humidifier prescription need to say?
A humidifier prescription must contain all of the following information:
  • One of the following words or phrases: "CPAP Humidifier", "Humidifier", "HH", "CPAP Supplies", "CPAP Mask", "CPAP", "Continuous Positive Airway Pressure", "APAP", "AutoPAP", "AutoSet", "Auto CPAP", "Auto Adjusting CPAP", "Self Adjusting CPAP", "BiPAP", "BiLevel", "VPAP", "BiPAP Auto", "BiPAP ST", "Synchrony ST", "VPAP ST"
  • Your physician's contact information
  • Your physician's signature
  • The patient's full name

Here are some of our top selling humidifiers:

PR System One 60 Series Heated Tube Humidifier with Heated Tube
Transcend Heated Humidifier
XT Heated Humidifier
+ See More

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"Super helpful, fast shipping, friendly assistance, great selection, I love this company."

- Verified Customer, 10/25/22

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★★★★★

Verified purchase | Dec. 17, 2010 | Verified CPAP.com Customer
great doing business with you....
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★★★★★

Verified purchase | Mar. 30, 2010 | Verified CPAP.com Customer
Very satisfied. My vpap works like new again.
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★★★★★

at least it works

Verified purchase | Feb. 08, 2010 | Verified CPAP.com Customer
The humidifier for the behemoth Malibu works well and provides comfortable warm moist air thru the night. The same cannot be said for the new H-4i that fits on the Resmed S8 pumps. I have had two fail in less than two months. The unit will "warmup" ,run for about two hours, then fail in the wee small hours of the morning, while the whole wide world is fast asleep. Totally useless unless you are lucky enough to wake up and set up the trusty Hc-150 from Fisher-Paykel. I cannot in good faith recommend the H-2i as it has only been used twice. My original H-4i went well for three weeks before dying. Maybe Resmed just does not have the bugs worked out of these attached units.ADVICE: buy the Hc-150 and sleep well.
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★★★★★

Great service

Verified purchase | Jul. 15, 2009 | Verified CPAP.com Customer
The humidifier is working great and received it in a timely manner. Would do business with this company in the future
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★★★★★

Verified purchase | Apr. 17, 2009 | Verified CPAP.com Customer
My husband uses this humidifier with his ResMed V Pap machine. However, after 4 years of nightly use, it no longer heats effectively so we ordered a replacement. The replacement works perfectly. We like that it is compact and integrated with the VPap. My husband has complex sleep apnea (central and obstructive) and after a second set of sleep studies he was prescribed the ResMed Adapt SV to address these problems. The Humidaire 2i also fits the Adapt SV and we are looking forward to several more years of trouble free use.
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★★★★★

Verified purchase | Jan. 03, 2008 | Verified CPAP.com Customer
It mer my expectations.
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