Inogen One G3 System - POC Review

Another remarkable portable oxygen concentrator (POC) by Inogen, G3 System provides flow upto 4 pulse settings with exciting features like user replaceable sieve beds and text display of alarms.

Known for its user friendly interface, Inogen has left no stone unturned to make it one of the best POC in the market today.

Inogen One G3 System

What you would like about Inogen One G3 System:

  • LCD Screen to display important parameters like flow, estimated time remaining on the battery, etc.
  • Wide Range of alarms
  • Two battery options to choose from
  • Decent Battery Duration – 4.5 hours
  • User Replaceable Sieve Beds
  • Alarms get displayed on the LCD screen along with the solution
  • Success of predecessor Inogen One G2 System
  • FAA approved – Can be used in airplane

What you won’t:

  • No continuous flow


Inogen One G3 weighs 2.1 Kgs (4.8 lbs) with 8-cell single battery and 2.6 kgs (5.7 lbs) with the optional 16-cell double battery. There is no other POC in the market that is lighter which provides flow upto 4 pulse setting.

Airsep Focus and Freestyle 3 are the only two por

Related: Compare Inogen One G3 vs AirSep Freestyle 3 vs AirSep Focus

Inogen One G3 System User


Inogen One G3 system is a wearable POC and is at par in size when compared with other POCs which provide similar flow.

The POC is 45% smaller than the predecessor Inogen One G2 system.

Dimensions: 7.25” H x 3” W x 8.75” D

Inogen One G3-One G2 Size comparision

Oxygen Purity

Company claims: 90% (-3% / +6%)

LCD Screen

Inogen one G3 is the only pulse flow POC in immediate competitors which has an LCD Screen to display the important parameters.

The LCD screen dispays:

  • Flow Setting
  • Power Status
  • Battery Life Remaining
  • Alarms

This makes it the most interactive POC as patients usually prefer to read on the screen rather than identifying the visual indicator signals.

Inogen One G3 System LCD Display

The display button on control panel illuminates the backlight of screen for better visibility in dark surroundings.


Inogen has always been generous in providing good battery backup.

External battery, nicely designed - looks like part of the POC - easy to replace unlike competitors.

Inogen One G3 System Battery Installation

Battery options:

  • 8 - cell single battery (standard) - 4.5 hours backup
  • 16 - cell double battery (optional) - 9 hours backup
Inogen One G3 System Battery

16 - cell battery makes the machine 500 grams (1.1 lbs) heavier.

Recharge time from fully depleted state

  • Single Battery: 2 - 4 hours
  • Double Battery: 4 - 8 hours

Power Sources

Inogen G3 works on 3 sources:

  • AC Mains
  • DC Source (like car charger)
  • Rechargeable Battery


Inogen G3 provides flow upto 4 pulse settings with the increments of 1. The flow can be easily set by two push +/- buttons.

Sieve Beds

Inogen has incorporated the feature of user replaceable sieve beds in G3 System.

Normally in every other POC, the sieve beds are inside the machine and can not be replaced by users. Changing the sieve beds is as simple as replacing the batteries of a TV remote.

Inogen One G3 Sieve Beds

Related: Inogen - About the Company


Inogen G3 is the only Pulse flow POC that has an LCD screen to display alarms.

The alarms are displayed in the form of easily understandable text along with solution of the problem.

No other POC in the market has such an interactive alarm system.

Low Priority Alarm
Text Display Fault Alert/Alarm Light Audible
Battery Low Attach Plug Battery Low Solid Red Light Double Beep
O2 Service Soon Service needed within 30 days Solid Red Light Double Beep
Check Battery Error in battery conncection Solid Red Light Double Beep
Oxygen Low See Manual O2 purity has dropped to 82% Solid Red Light Double Beep
Remove Battery to Cool Battery temperature high Solid Red Light Double Beep
Comm Error See Manual O2 getting produced but not showing battery status Solid Red Light Double Beep
Service Needed Service required Solid Red Light Double Beep
O2 Sensor Fail See Manual Oxygen Sensor Malfunction Solid Red Light Double Beep
Medium Priority Alarm
Text Display Fault Alert/Alarm Light Audible
No Breath Detect Check Cannula No breath detected for 60 seconds Flashing Red Light Triple Beep Every 25 seconds
Oxygen Error Service Needed O2 purity is below 50% Flashing Red Light Triple Beep Every 25 seconds
O2 Delivery Error Oxygen not getting delivered properly Flashing Red Light Triple Beep Every 25 seconds
System Error See Manual Producing O2 but some error Flashing Red Light Triple Beep Every 25 seconds
Battery HOT warning Battery temperature high Flashing Red Light Triple Beep Every 25 seconds
High Priority Alarm
Text Display Fault Alert/Alarm Light Audible
Battery Empty Attach Plug Battery empty Flashing Red Light Five Beep Every 10 seconds
Battery HOT shutdown Battery temperature rise Flashing Red Light Five Beep Every 10 seconds
System HOT shutdown Concentrator has become hot Flashing Red Light Five Beep Every 10 seconds
System Cold Shutdown Concentrator has become cold Flashing Red Light Five Beep Every 10 seconds
Error (###) Service Needed Stopped Producing Oxygen Flashing Red Light Five Beep Every 10 seconds

Warm Up Time

2 minutes

Inogen One G3 System


2 minutes


10,000 ft (3,048 m). Airsep Freestyle has a higher altitude upto 12,000 ft.

Carrying Case

Inogen One G3 System with carrying case


Inogen One G3 System backpack harness

International Approvals

  • US Food & Drug Administration (FDA)
  • Federal Aviation Administration (FAA)
  • CE Marked
  • ISO

Country of Manufacture

United States of America (USA)

Top 5 Wearable POCs in Inogen G3' competition

  1. AirSep Freestyle 3
  2. Airsep Freestyle 5
  3. Invacare XPO2
  4. Inogen One G2
  5. AirSep Focus

Top 3 comparison with AirSep Freestyle 5

  1. Inogen One G3 v/s Airsep Freestyle 3
  2. Inogen One G3 v/s AirSep Freestyle 5 v/s Invacare XPO2
  3. Inogen One G3 v/s Inogen One G2

Launched in 2012, Inogen G3 has made its mark in the market.

With exceptional features like LCD screen, user replaceable sieve beds, detachable battery and interactive alarm system, Inogen G3 is undoubtedly the best pulse flow portable oxygen concentrator in its league.

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Jake Martinez
Posted from Philippines on: 2020-12-03 at 03:39:42
Hi Oxygen Times! Would have a list of Inogen One dealers in the Philippines? Thanks!
earl fuller
Posted from Missouri-USA on: 2020-11-13 at 03:11:13
We own an Inogen g3, that we bought around May 2019, used by my father. He did not tell us the display screen stopped working, even though the unit seems to be supplying oxygen when he decides to use it. How to I arrange to get the display screen replaced? I might as well replace the columns and do routine maintenance at the same time.
Eileen Green
Posted from USA on: 2020-06-08 at 16:05:07
Why would my Inogen 3 stop showing the screen info? Unit stays on for a few moments then shuts down
Kristin Duro
Posted from United States on: 2020-05-07 at 19:54:03
My mother just got the inogen One G3 a week ago and there is a message coming up saying o2 delivery error. Why is this happening and what do we need to do?
Oxygen Times
Replied on: 2020-05-08 at 05:17:06
Hi Kristin, Inogen One G3 is a pulse flow oxygen concentrator which means it only gives out oxygen when it detects a breath. Please make sure that nasal cannula is properly connected to the machine and the patient is breathing through the other end. You need to contact Inogen service centre if the issue persists. Hope this helps!
Posted from usa on: 2018-01-26 at 13:09:47
If you wore a face mask at night using the Inogen one g3 would it detect mouth breathing?
Oxygen Times
Replied on: 2020-05-08 at 05:40:19
As long as nasal cannula is inside the mask near the nostrils so that it detects the breath.
Posted from united states on: 2017-12-24 at 14:52:49
It quits making oxygen but it is still running none of the buttons do anything take batt. lose push it back in it works fine
Oxygen Times
Replied on: 2017-12-25 at 23:02:11
Hi Toni, can you please explain the issue in detail?
Posted from Philippines on: 2017-10-12 at 03:28:23
My Imogen 3 quit working. Where can it be repaired in the Philipplnes. I live in San Fernando, La Union, Ilocos Norte 2500 Cell# 072-607-7866, if calling from out of country then dial 63-72-607-7866
Oxygen Times
Replied on: 2017-10-14 at 04:27:42
Hi Roger, currently we don't have the list of service centers in Philippines.
kathleen bigler
Posted from United States on: 2017-09-09 at 15:34:27
i am oxygen 24/7 3 flo continuous flow. needed fr going out of home, emergencies . need sleep mode with a continous of 4 flo.
Oxygen Times
Replied on: 2017-09-10 at 08:19:38
Hi Kathleen, there is no portable oxygen concentrator that provides continuous flow over 3 LPM.
Nancy Merbitz
Posted from USA on: 2017-05-10 at 21:31:28
My mother is 89 and although bright has had some decline (related to hypoxia before agreeing to use oxygen). She hates the idea of using anything, and if it's hard to learn she may reject it. What support does Inogen provide to help the person learn how to use their equipment? She will need repeated practice. Thanks
Oxygen Times
Replied on: 2017-05-10 at 23:16:07
Hi Nancy, Inogen has user manuals and setup videos for all their concentrators which provide sufficient information on setting up and using their concentrators. You can follow this link to view them. You will find it helpful. Hope this helps!
Nancy Merbitz
Replied from USA on: 2017-05-11 at 06:59:48
Nope not helpful. 89 years old, with cognitive slowing. She will not move in with me and I live far away. She will need help locally. Your answer means there is no human being working for your company who will actually come help her learn to use it. No thanks.
Oxygen Times
Replied on: 2017-05-11 at 07:31:19
Nancy, Oxygen Times is an independent informational website where we help people with our unbiased reviews and comparison of different concentrators. We neither sell nor service oxygen concentrators. You have to contact your equipment provider or the equipment manufacturer since your mother needs hands on training in using the concentrator. Should you have any other query, we would be happy to help.
Nancy Merbitz
Replied from USA on: 2017-05-11 at 08:25:57
Thank you - I misunderstood and thought this was going to Inogen. Who funds OxygenTimes?
Oxygen Times
Replied on: 2017-05-11 at 08:38:31
Oxygen Times is a web portal developed by Codepenters to help people who need information and guidance on oxygen concentrators.
Dianna Schneider
Posted from United States on: 2017-03-10 at 14:36:24
I have a inogen one G3, the red senor light is on and saying o2 service soon. I called to report this. I paid extra to get the lifetime warranty. I'm being told that the warranty doesn't cover this,that the (sieve beds) I guess that's what they are called. That they are a accessories. How are they are accessory? You need them to operate the machine. I was never told any of this at the time I bought this. Im on a fixed income,I can't pay for this. If I would of know this I would of never bought this unit. I have no idea what to do right now. Any advice?
Oxygen Times
Replied on: 2017-03-25 at 02:51:24
Hi Dianna, Inogen considers sieve beds as accessory because they are use replaceable. Unfortunately, there is nothing you can do in this case except from buying sieve beds from the provider.
Howard Brodie
Posted from USA on: 2017-01-13 at 13:59:49
I use my stationary oxygen concentrator hooked up to my CPAP machine when i sleep. Am i getting oxygen throughout the night?
Oxygen Times
Replied on: 2017-03-17 at 00:18:50
Yes, you are getting the oxygen through out the night
Louis Philip Manuel
Posted from India on: 2016-12-31 at 19:33:31
I am using Inogen One G3. Pl. tell me about service centers in India to replace sleeve beds/columns and for maintenance
Oxygen Times
Replied on: 2017-01-02 at 05:49:45
Hi Louis, we don't have any Inogen distributor or service centre in our database for India.
Charles Varey
Posted from USA on: 2016-12-30 at 21:39:13
I have a new InogenOne G3 and don't use it very often. The unit has less than 10 hours on it. I'm getting an oily substance being discharged from the outlet tips on the cannula. No, it's not my nose running.
Oxygen Times
Replied on: 2017-01-02 at 05:48:24
Hi Charles, you need to contact your equipment provider regarding this.
Posted from Florida on: 2016-12-12 at 12:15:00
G3 reading low oxygen but cannot find reason in manual.
Oxygen Times
Replied on: 2017-01-02 at 05:47:22
Hi Kelmedix, contact your equipment provider.
Al Carter
Posted from US on: 2016-11-17 at 15:02:57
Having problems with home health care. I have insurance ok for both home and portable concentrators. SG Home Care, my supplier, is claiming that I can not use the portable units do to my flow rate of 3/l min and the battery life would be to short. The tanks I am using is detrimental to my well being. Besides my COPD I have Cardiac issues being aggravated by the weight of my oxygen delivery method. Please contact me at 510-239-8493. SG Homecare number is 877-700-9661. Thank you.
Oxygen Times
Replied on: 2017-03-17 at 00:31:15
Hi Al, you can use the Inogen One G3 if you need pulse flow of 3 LPM, but if you require continuous flow of oxygen at 3 LPM then you won't be able to use the G3 system. Also, the battery gets discharged quicker if you use the machine at higher flow.
Posted from South Africa on: 2016-10-11 at 06:34:09
Hi I suffer with intense Cluster Headaches, once the cluster bout is present, no medication helps at all however Verapamil pills do prevent it for a while only, Wanted to know if the Inogen One G2 Portable Oxygen Concentrator will help when the headache is present?
Oxygen Times
Replied on: 2016-10-21 at 23:18:14
Hi Kumar, cluster headache patients usually require high flow oxygen (around 8 LPM) for about 10-20 minutes during the clusters. Inogen One G3 may not be the best concentrator in your case. You can either use a high flow oxygen cylinder or a high flow home oxygen concentrator like AirSep Intensity 10, Invacare Platinum 10 or Philips Respironics Millenium M10. Do consult your physician for the flow before you go ahead with this.
Posted from India on: 2016-09-29 at 01:33:11
I need price range for Inogen G3 in Pune, India.
Oxygen Times
Replied on: 2016-10-04 at 05:10:07
Hi Ajay, here is the list of Inogen Oxygen Concentrator dealers in India as per our dealer finder tool.
Kevin Chmielnik
Posted from USA on: 2016-07-31 at 20:00:46
My mother has just ordered a G3 unit. Can this replace her home generator and all portable tanks?
Oxygen Times
Replied on: 2016-08-10 at 01:26:38
It depends on patients oxygen requirement. We will be able to help you out with this once you answer the following questions:
-How much oxygen has been prescribed to the patient?
-For how many hours a day?
-Is the requirement Pulse flow or continuous flow?
Michael myers
Posted from USA on: 2016-07-26 at 18:09:47
I have an Imogen G3 and would like to use it while hiking above 10,000 feet. How will performance be affected as I go higher? The machine is rated up to 10,000 feet
Oxygen Times
Replied on: 2016-07-28 at 06:08:17
Hi Michael, the purity of oxygen starts to drop as you cross the altitude of 10,000 feet.
Niki van Niekerk
Posted from South Africa on: 2016-07-23 at 08:59:50
Is this available in my country.
Oxygen Times
Replied on: 2016-07-28 at 06:04:58
Hi Niki, we don't have a database of oxygen concentrator dealers for South Africa yet.
Robert Ouellette
Posted from Canada on: 2016-07-22 at 11:12:44
Where can I send my Inogen One G3 for service and maintenance ... or where can I buy the part too make it my self... Thank you its a great machine.
Oxygen Times
Replied on: 2016-07-28 at 06:04:17
Hi Robert, we don't have a database of Inogen service centres in our database.
Sheila Wall
Replied from Canada on: 2017-01-27 at 13:42:39
CPAP Machines Canada has 3 locations in Canada. Here is their website for the G3.
Posted from Canada on: 2016-06-17 at 09:39:39
Is there any place in Canada where I can bring my concentrator for review and maintenance time to time shows oxygen low and I am scare that it fails. Thanks.
Oxygen Times
Replied on: 2016-07-15 at 08:51:48
Hi Maria, we don't have a database of equipment providers and service centres in Canada.
Sheila Wall
Replied from Canada on: 2017-01-27 at 13:40:47
CPAP Machines Canada has 3 locations in Canada. Here is their website for the G3.
Leonard Norris
Posted from USA on: 2016-06-04 at 10:49:07
Is the Inogen G3 the same POC as Oxygo, look identical with identical looking batteries and accessories.
Oxygen Times
Replied on: 2016-06-15 at 00:12:27
Hi Leonard, you have pointed out something very interesting. We are yet to have our hands on Oxygo, once we do, will let you know.
Betty Long
Posted from USA on: 2016-04-15 at 18:22:18
Hello, my name is Betty Long. I own the Inogen one G3. My alarm goes off showing 02 service soon. What needs to be done to fix the problem?
Oxygen Times
Replied on: 2016-04-24 at 00:20:26
Hi Betty, this alarm means that column maintenance is required within 30 days. You can press and hold the light button for 3 seconds to clear message from the display. The message will be silenced for 72 hours. Contact your equipment provider to arrange for service.
Betty Long
Replied on: 2016-04-25 at 01:41:14
Thanks. I ordered three sets of sieves. Love the machine, its best machine yet!
Lee Dooley
Posted from United States on: 2016-03-12 at 08:40:44
Does the G3 have an internal battery backup?
Oxygen Times
Replied on: 2016-03-30 at 05:07:06
Hi Lee, Inogen One G3 has no internal battery.
Jon Hudson
Posted from USA on: 2016-01-29 at 18:01:08
I need to run my POC into a bi-pap machine at night just on a 2-3 liter setting. When I do this it says breath cannot be detected of course. I just want to confirm that it will in fact continue to push oxygen out throughout the evening ignoring the alarm. I only have to do this about 5 nights a year, so not something I want to change manufacturers as a result of for a continuous flow concentrator.
Oxygen Times
Replied on: 2016-02-14 at 04:49:28
Hi Jon, Inogen One G3 is a pulse flow only concentrator, it gives oxygen only when it detects your breath. In this case, machine will not be giving any oxygen at all.
Oz Adams Adams
Posted on: 2015-12-25 at 22:25:58
How does the Inogen compare to liquid oxygen %age of purity?
Oxygen Times
Replied on: 2015-12-28 at 02:59:12
Dear Oz Adams, purity of liquid oxygen (>99.5%) is higher than all oxygen concentrator machines including Inogen POCs which have oxygen purity of about 90-95%.
Bob Y
Posted from Philippines on: 2015-10-15 at 04:03:23
How good are the "factory refurbished" and certified units advertised on the internet? Can these be trusted to provide the recommended 90%-95% oxygen needed? Thanks
Oxygen Times
Replied on: 2015-10-16 at 01:45:28
Hi Bob, factory reburbished and certified oxygen concentrators are mostly good and can be trusted to provide 90-95% purity. But still its always recommended to get an Oxygen purity check of the machine using oxygen meter before buying.
Ken Cox
Posted from USA on: 2015-10-04 at 18:19:40
How often do sieve beds need to be replaced?
Oxygen Times
Replied on: 2015-10-06 at 10:36:36
Hi Ken, as per Inogen One G3 user manual, the expected sieve bed life is 1 year.
Norm Zannino
Posted from USA on: 2015-07-28 at 12:13:52
What is the purpose of the sieve beds in inogen one g3
Oxygen Times
Replied on: 2015-07-28 at 12:24:28
Hello Norm, Sieve beds are the main functional unit of any Oxygen Concentrator. They separate Nitrogen from air leaving about 90 - 95% pure Oxygen. Read How do Oxygen Concentrators work? to learn more.
Sandy Nelson
Posted on: 2015-06-20 at 13:11:53
Inogen one G3 very frequently alerts that "no breath is detected". Nothing wrong with cannula. I think it is from open mouth breathing at night. I infrequently inhale. My understanding of this product is that when I do eventually inhale the machine will provide extra oxygen. My big question is.... given all that I have said, is this machine appropriate for meeting my sleep time needs. Am at setting 2 during day and at 3 during night.
Oxygen Times
Replied on: 2015-06-20 at 14:06:28
Hello Sandy, Inogen one G3 works pretty well for a lot of patients during sleep and as you said, it does adjust its dose to make up for the decreased breath rate at that time. In your case you are breathing through your mouth at night, so no pulse flow portable oxygen concentrator would meet your requirement at night as they are effective only when you breath through your nose. You would require a continuous flow oxygen concentrator preferrably with a simple face mask.
Jules Briere
Posted from Canada on: 2015-05-22 at 15:55:07
What is the sound level of this concentrator?
Oxygen Times
Replied on: 2015-05-22 at 22:39:48
Hello Jules, sound level of Inogen One G3 System is 42 dB at pulse setting 2. You can expect it to be around 45 dB at higher flow settings.

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