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Water Chamber for H4i™ Heated Humidifier

BY ResMed  |  Item #26952
(79) Read Reviews
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Product image for Water Chamber for H4i™ Heated Humidifier
Product image for Water Chamber for H4i™ Heated Humidifier - Thumbnail Image #1
H4i Chamber shown installed. Humidaire Humidifier and Lid sold separately
Product image for Water Chamber for H4i™ Heated Humidifier - Thumbnail Image #3
How to Clean and Maintain your CPAP Equipment
Rainout, Causes & Solutions
H3i and H4i Humidifier Differences and Upgrade Path
Click image to expand
Product Thumbnail Image #1 H4i Chamber shown installed. Humidaire Humidifier and Lid sold separately Product Thumbnail Image #3
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Product Image for Water Chamber for H4i™ Heated Humidifier - Thumbnail Image #1 H4i Chamber shown installed. Humidaire Humidifier and Lid sold separately Product Image for Water Chamber for H4i™ Heated Humidifier - Thumbnail Image #3
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H4i Heated Humidifier Water Chamber

The replacement Standard Water Chamber for ResMed's H4i Heated Humidifier used with the ResMed S8 should be replaced every 6 to 12 months to keep your CPAP equipment working like new. The Standard Water Chamber easily lifts up to be cleaned and refilled, and cannot be cleaned in the dishwasher.

The replacement Standard Water Chamber is the same chamber included with the H4i Heated Humidifier at the time of purchase.

This product only includes the water chamber.

What's Included:

  • 1 Replacement Humidifier Chamber

H4i Heated Humidifier Water Chamber

The replacement Standard Water Chamber for ResMed's H4i Heated Humidifier used with the ResMed S8 should be replaced every 6 to 12 months to keep your CPAP equipment working like new. The Standard Water Chamber easily lifts up to be cleaned and refilled, and cannot be cleaned in the dishwasher.

The replacement Standard Water Chamber is the same chamber included with the H4i Heated Humidifier at the time of purchase.

This product only includes the water chamber.

What's Included:

  • 1 Replacement Humidifier Chamber

Learn More About This Product

This product is the water chamber only and does not include the heated humidifier or any other parts or accessories.

Humidaire H3i Water Chambers are no longer available. H3i users can use a H4i chamber with their H3i Humidifier if the H4i™ Heated Humidifier Top Cover Lid and Seal is purchased. CPAP.com offers two upgrade kits which include this item as well as either a Standard or Dishwasher Safe chamber:

  • H4i™ Water Chamber Upgrade Kit for HumidAire 3i™ Heated Humidifiers
  • Dishwasher Safe H4i™ Water Chamber Upgrade Kit for HumidAire 3i™ Heated Humidifiers

    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.
    • When disconnecting the hose from the tank outlet, be careful to ensure that the hose is not holding water. Water could travel through the hose and into the machine.
    • 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.

    Please note: The manufacturer warranty is voided by water damage or misuse of the machine.

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.
Are prescriptions required for mask, machine, humidifier, and EPAP purchases?

Yes. Federal law requires we have a valid prescription on file before we ship your mask, machine, humidifier, or EPAP therapy, including Provent and Bongo RX. You will also need a prescription to purchase the Nightbalance POSA device.


We provide many easy ways to get your prescription:

  • We can request your prescription for you! When you checkout, just let us know you would like us to request your prescription, or you can log into your account to have us request your prescription.
  • Fax your prescription to our toll-free fax number: 866.353.2727, or our international fax number: 713.541.7377
  • Email your prescription to cpap@cpap.com
  • Upload your prescription in your account, under the Prescriptions Section
  • Ask your doctor to fill out our prescription form. We have both a standard prescription form and an EPAP prescription form.


For more information on prescriptions, please see our Prescription Section of the Learning Center.


What are the CPAP, BiPAP, Sleep Apnea, and Oxygen related HCPCS, CPT or billing codes?

E1399 is Miscellaneous and is used for other CPAP and Oxygen items.
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

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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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Customer Reviews

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★★★★★
4.7 79 Reviews
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★★★★★

Good price and fast shipping

Verified purchase | Feb. 11, 2024 | Ron R. | Recommended
Happy that I was able to purchase this item for my discounted cpap. Best price I could find and even the expedited shipping charge wasn't too bad.
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★★★★★

replacement for old unit

Verified purchase | Aug. 07, 2023 | S.M.M. H. | Recommended
easy peasy to find nice new replacement humidifier containers for my old as heck resmed s8 unit

CPAP.com suggested the right replacements

kinda hard to tell the humidifier would fit

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★★★★★

Excellent

Verified purchase | Feb. 06, 2023 | Verified CPAP.com Customer
The water chamber was new, clean, and packaged securely to prevent damage. I used standard shipping and it still arrived very quickly. I'm very pleased.
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★★★★★

Water chamber

Verified purchase | Dec. 22, 2022 | Verified CPAP.com Customer
Works great...must clean often to prevent lime buildup.
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★★★★★

As expected and at a great price

Verified purchase | Jul. 03, 2022 | Verified CPAP.com Customer
We continue to be very happy with the quality of the products and the price here. They beat Amazon on both price and shipping times. And the customer service is excellent.
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★★★★★

Pretty good

Verified purchase | Mar. 24, 2022 | Verified CPAP.com Customer
The new water chamber is clean and fits perfectly into my CPAP machine. My only complaint is that it’s hard to clean because the way the chamber is designed, you never can get all of the water out of the chamber or reach inside so you can clean the bottom and the sides. It would be nice to have the ability to lift up the top entirely for better access for cleaning.
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