ResMed H4i CPAP Humidifier
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ResMed H4i CPAP Humidifier

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Starting at $14.05/mo with store logo mobile Respshop Payment Plan. Learn More

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High Performance, Long Lasting CPAP Humidifier

The HumidAire H4i Heated Humidifier effectively targets most symptoms associated with sleep apnea and CPAP machines. The Humidifier will reduce your likelihood of rainout and congestion while providing you with a comfortable and relaxed night of sleep. Built with convenience in mind, ResMed designed the H4i with easy-to-use controls and simple operating instructions. Help yourself get a great night's sleep, and give the H4i a try.

More Humidification

Building off earlier models, ResMed's HumidAire H4i provides 30% more humidification than the H3i. Built with a larger water chamber than the last model, the humidifier will now work even more efficiently.

Symptom Relief

ResMed's HumidAire offers ergonomic sleep apnea therapy. The device effectively combats a variety of sleep apnea symptoms, including rainout; dry throat; and nasal congestion, without compromising on performance.

Easy to Use

It won't take you any time at all to get your HumidAire up and running. You can fill the water chamber inside the humidifier without removing any tubing and the device is powered by ResMed's S8 and S8 II machines, so you won't need to worry about batteries or deal with hooking it up anywhere. Easy dial controls make it easy to use the device at any time of day.

Key Features

  • Small and Easy to Pack
  • 390 ml Capacity for soothing Humidifying Experience
  • Simple Controls

Reviewers Tip:

Make sure not to overfill the water, it will damage your device.


Will this humidifier work with the previous series of ResMed CPAP machines?

The HumidAire H4i will only work with Series 8 devices.

I've been having trouble with water coming up the hose: any idea why?

Turn down your temperature setting. This can happen if your water chamber is full and you've turned the temperature on too high.

How often should I be cleaning the Humidifier?

We recommend that you clean your H4i daily.


Available Accessories

Also, see these items:




Return on warranty issues only.


Model 24927
HCPCS Code E0562
Machine Weight 1.6 lb (732g)
Machine Size Only 5 x 6.7 x 8.3 inches (118 x 164 x 145 mm)
AC Input 100-240V, 50/60Hz; 110V, 400Hz; 2.5A less than 140 VA (110 W)
Warranty Heated Humidifier - 1 Year, Water Chamber - 90 Days
Capacity Water Chamber - 390 ml max

S8 Humidifier
Water Chamber - 390 ml capacity
Diana A 11/20/2018
5 of 5 Stars!

Ours just broke , has error 1019, question do you take Medicare have prescription to purchase one . Please get back to me 361-237-6332.

Randall E 02/24/2023
5 of 5 Stars!

Subject: Humidifier for Res Med
The humidifier is a little bit different than the original the heating plate is twice the size of the original so it puts water into the mask twice as much and fast. I turned it down one notch each night until I equalized the amount to what I originally had. about four nights to get it equal to my settings.
Thanks for having the parts I needed. Thanks for the speedy delivery also.

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Have a question on this item? Ask here and we will answer it in 12-24 hours, usually in a few business hours! Questions and answers will appear here after we answer. You may also have email notifications.
How do I print my data off my machine my doctors office says they can’t do it because the machine is old but it’s only two years old amd works great
Please contact our office and we will help answer this question. we will need to know what unit you are currently using. 1-866-936-3754. Thank you
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