Inogen One G3 vs. Inogen One G4 Concentrator Comparison

Choosing the right oxygen concentrator for you can be stressful, especially if you aren’t sure where to start. There are many oxygen machines out there today, so it can be exhausting researching each machine.

Oxygen Concentrator Store has a variety of oxygen concentrators and portable oxygen machines. One brand that we offer a few different models from is Inogen. This oxygen company was launched in 2001, and it offers three main oxygen concentrators: Inogen One G3, Inogen One G4, and the Inogen at Home. All three products have benefits, although they are specific — depending on your oxygen needs.

To help you choose the right oxygen concentrator, we’re highlighting the two portable Inogen oxygen concentrators. We’ll give you a side-by-side comparison of both the Inogen One G3 and the Inogen One G4. Once you asses your individual needs, you can decide which machine is best for you.

Inogen G3 and Inogen G4 Oxygen Flow Settings

Although the G3 and G4 Inogen models have similarities, there are a few significant differences. Both of these portable oxygen machines offer a pulse dose method of delivering air. This mode conserves oxygen, and it has a number of settings depending on your needs.

The Inogen One G3 offers settings from 1-5; the Inogen One G4 only has settings 1-3. Having multiple settings is helpful for those who have a variety of activities they need oxygen for, as the settings "can deliver the proper amount of oxygen during all phases of daily activity and rest".

Inogen One G3 vs. Inogen One G4 Portable Oxygen Concentrator

Weight and Size

Both portable oxygen concentrators are under five pounds, although the G4 model weighs less than the G3. With a single (small), battery the G4 model weighs only 2.8 pounds; it weighs just 3.3 pounds with the 8-cell (large) battery. The G3 model weighs just under five pounds with the standard 8-cell (small) battery.

The two concentrators are relatively easy to carry while on the go, as they aren’t very big. The G4 model is about seven inches tall, six inches wide, and about three inches deep. The G3 model is a little more than eight inches tall, almost nine inches wide, and three inches deep.

Battery Life

The life of your machine during each use will depend on the battery it houses and the setting you use it on. The Inogen One G3 concentrator has two options: 8-cell (small) battery or 16-cell (large) battery. Although this machine is under five pounds with the 8-cell, it will weigh more with the 16-cell. However, with the 8-cell battery, you get an average of 1.7 hours on setting five and an average of 4.5 hours on setting one. The length of battery life depends on which setting your machine is on, along with the size of the battery.

The Inogen One G4 also has two battery options the 4-cell (small) battery or the 8-cell (large) battery. With the 4-cell battery, the machine can last on average 1.2 hours on setting three and an average of 2.4 hours on setting one. Once again the length of battery life depends on which setting your machine is on, along with the size of the battery.

Side-by-Side Unit Comparison

*includes single battery
Width: 8.75 inches
Depth: 3 inches
Height: 8.25 inches
Width: 5.91 inches
Depth: 2.68 inches
Height: 7.2 inches
4.9 pounds
2.8 pounds with single battery

Oxygen Settings
Continuous Flow: Not supported
Pulse Dose: 1 to 5 settings
Continuous Flow: Not supported
Pulse Dose: 1 to 3 settings

Battery Duration
Pulse Dose: 8 hours, on setting of 2 with larger 16-cell battery
Setting of 1: 2 hours 40 minutes
Setting of 2: 2 hours 15 minutes
Setting of 3: 1 hours 20 minutes

Battery Charging Time
Approximately 2-4 hours for 8 cell battery
Approximately 3 hours for single battery

Noise Level
Less than 39 decibels
Around 40 decibels at a setting of 3

Maximum Oxygen Output
1050 ml/min
630 ml/min

FAA Approved

3 Year Warranty on Unit, 90 Day Warranty on Accessories
3 Year Warranty on Unit, One Warranty on Accessories

Additional Information

Both the G3 and G4 models are fairly quiet machines, with 39 decibels for the G3 and 40 for the G4. The noise level is comparable to the sound of a "quiet conversation." The G3 model comes with a carry bag that has a strap on it. The G4 model has a strap on the machine, along with a separate carry bag.

The Final Choice: Inogen One G3 vs. Inogen One G4

Specifications of the Inogen One G3 and the Inogen One G4 are relatively similar to one another. The G3 model is a little larger and heavier in size, although it offers more settings than the G4 model. Both models are intended to help those with COPD while they’re on the go, or while they are at home.

Have more questions about for these units?

About Scott Ridl: Scott joined American Medical Sales and Rentals in 2008 as a Web Manager and Content Writer. He is a writer and designer. He is extensively trained on oxygen therapy products from leading manufacturers such as Inogen, Respironics, Chart, Invacare, ResMed and more. Scott works closely with respiratory therapists and oxygen specialists to educate the community about oxygen therapy products, COPD, asthma and lung diseases. He writes weekly columns and is passionate about educating the community on oxygen therapy and respiratory issues.

2 thoughts on “Inogen One G3 vs. Inogen One G4 Concentrator Comparison”

    ALBA ROCIO SANCHEZ July 2, 2019 at 6:32 am

    Salut cordial,
    I am interesting to buy a Concentrator inogen G. Please let me know how much the machine?

    • Ed Rodgers

      Hello Alba,
      The pricing for an Inogen G3 starts at $2295 but we do offer different offers from time to time. If you give us a call at 888-743-0156 we can see which concentrator is best for your needs.


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