ResMed H4i CPAP Humidifier

For Reference Only

Returns on warranty-related issues only

Key Features:

  • Compatible with all ResMed S8 and S8 II CPAP and BiPAP machines
  • Fliptop Lid for easy filling
  • 390ml Maximum Capacity
  • Dial Control for humidity adjustments
  • Removable Water Chamber Base for easy cleaning
Product Details

H4i Heated Humidifier for S8 CPAP and BiPAP by ResMed

The ResMed 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.


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.

Technical Data
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)
Heated Humidifier - 1 Year, Water Chamber - 90 Days
Water Chamber - 390 ml max
Item Includes

1x ResMed H4i Heated Humidifier with Water Chamber

Reviews (2)
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5 of 5 Stars!
Diana A
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Ours just broke , has error 1019, question do you take Medicare have prescription to purchase one . Please get back to me 361-237-6332.
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5 of 5 Stars!
Randall E
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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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Q&As (1)
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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