Inogen Oxygen G5: An Expert Review and Buying Advice

Inogen One G5: An Expert Review and Buying Advice

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The Inogen One G5 is the latest addition to the family of Inogen’s user-friendly portable oxygen concentrators. With expanded features built on the foundations of the Inogen One G3 and the Inogen One G4, the Inogen One G5 is looking to be a “one-size-fits-all” portable oxygen concentrator that will do well for almost any person who requires supplemental oxygen on-the-go.

In this blog post, I will discuss what is new in the Inogen One G5 and provide my overall review. If you missed my latest review of the Inogen One family of portable oxygen concentrators (which includes the Inogen At Home 5L stationary concentrator), be sure to read that blog post to get a full scope of the differences between each device.

Why I’m An Expert

I am not affiliated in any way with Inogen, so my review of these products constitutes from publically-available information by Inogen and my experiences as a board-licensed respiratory therapist for 11 years, working primarily in acute care hospitals. My experience has exposed me the various challenges and situations that relate to oxygen therapy use, both in the hospital and home settings. Through my training and clinical experience, I have worked extensively with various Inogen product and providing my opinions in the post.

Finally, this post does not constitute medical advice in any way. It is advised to discuss the specifics of these oxygen concentrators with your doctor before ultimately purchasing a device to ensure you have the right equipment for your needs. This information is for educational purposes only.

What is New in the Inogen One G5

There are 2 primary updates with the Inogen One G5: the flow setting capacity and battery life.

It seems that Inogen focused the updates on this device to increase the user’s ability to get more oxygen if needed and to increase the overall life of the machine while on-the-go. Both of these additions will allow the user more flexibility in terms of being able to perform more activities of daily living without the need for constant equipment changes. These additions are consistent with Inogen’s mission to increase the independence of people who require supplemental oxygen.

Flow Setting Update

The pulse flow settings for the Inogen One G4 can reach a maximum flow setting of 3, while the Inogen One G3 can reach a maximum flow setting of 5. However, the Inogen One G5 is now capable of reaching a flow setting of 6, which makes it the most powerful oxygen concentrator available by Inogen, even surpassing their stationary concentrator.

Inogen One G5 6 Pulse Settings

While a higher flow setting might seem like a gimmick if you only need a low setting, there is a benefit to the higher liter flow setting for almost anyone requiring supplemental oxygen. Exercising with COPD can be a challenge because of the higher utilization of oxygen by your muscles, which means you will need to take in more oxygen during your exercise routine. However, if your device is not capable of reaching higher liter flows, you might be stuck limiting your exercise routine or only exercising at home where you can use your stationary oxygen device.

With 6 liter flow settings, the Inogen One G5 gives you even more capacity for getting the oxygen you need during exercise so you can go farther without needing to limit your routine.

Additionally, during emergencies, you might need more oxygen than you are typically prescribed with. Although the best strategy for dealing with an emergency is to call 911 or visit your local emergency room, there is greater peace of mind knowing that your portable oxygen device can go higher in liter flow until you can be seen and treated by a professional.

Battery Life Update

The Inogen One G5 has also increased the total battery life for the Inogen family. The Inogen One G3 previously held the highest battery capacity at 10 hours with a double battery, but the Inogen One G5 can now reach 13 hours with a double battery. The additional 3 hours is long enough to give you the freedom to run a few more errands or go a bit farther if you are traveling as well as the need to keep a second battery with you for the short local trips or outdoor activities.

Additional Updates

There are several more updates that, while smaller in scale, are an improvement over previous models.

The noise level for the Inogen One G5 has dropped to 38 decibels at setting 2, which is down from 39 decibels at setting 2 for the Inogen One G3. While not a very large drop, the Inogen family overall is already quieter than most devices on the market, so a slight decrease in noise level is just that much better.

Additionally, the Inogen One G5 is smaller in both height and length compared to the Inogen One G3, but the Inogen One G3 is still slightly smaller in width. Overall, the Inogen One G5 is smaller, but the Inogen One G4 still beats both the G3 and the G5 in terms of size and weight. However, the Inogen One G4 only reaches a maximum liter flow setting of 3, so the Inogen One G5 is still the overall most significant improvement.

My Overall Review of the Inogen One G5

In terms of updates, I think the Inogen One G5 is a significant improvement over previous models for those looking to do more and go farther in their daily lives. If you already have an earlier model, I wouldn’t say you need to retire the old for the new just yet, unless you know for sure you need the higher liter flow settings and longer battery life. However, if your current device is seeing its final days and you are looking for an upgrade, or if you are in the market for your first oxygen concentrator, the Inogen One G5 is a great “one-size-fits-all device” that will cover most of your supplemental oxygen needs.

Inogen One G5 Complete Package

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Ryan Anthony, BS, RRT is a registered respiratory therapist and content writer and medical blogger currently located in Los Angeles, California. As a Respiratory Therapist, he performs a wide range of hospital duties including adult and neonatal intensive care, nitric oxide therapy, high-frequency oscillatory ventilation, conventional mechanical ventilation, noninvasive ventilation, BiPAP, CPAP, intubation assistance, bronchoscopy assistance, cardiopulmonary resuscitation, chest physiotherapy, and nebulizer therapy.

About Ryan Anthony:

Ryan Anthony, BS, RRT is a registered respiratory therapist and content writer and medical blogger currently located in Los Angeles, California. As a Respiratory Therapist, he performs a wide range of hospital duties including adult and neonatal intensive care, nitric oxide therapy, high-frequency oscillatory ventilation, conventional mechanical ventilation, noninvasive ventilation, BiPAP, CPAP, intubation assistance, bronchoscopy assistance, cardiopulmonary resuscitation, chest physiotherapy, and nebulizer therapy.

141 thoughts on “Inogen One G5: An Expert Review and Buying Advice

      • The motor is reasonably quite but what’s with the annoying and loud double popping noise every 6ix seconds? Also are any of the components made in CHINA?

        • If you notice any new noise with your unit, please contact customer support at your equipment provider. They’ll help you out with the issue.

          • our’s did the same thing so we called Iogen and they listened to it over the phone and said that wasn’t right and sent us another one. it did the exact same double popping noise with the 2nd pop being the loudest (and annoying). The first pop is ok… So we called again and were sent a 3rd replacement which….yes, did the exact same thing. As I find it hard to believe that we were sent 3 bad units in a row I can only conclude that the double popping noise is a normal function.

          • Where you connect to concentrator kinks continuously the tubing supplied is rubbish way to soft for hot climates for $5000.00 I would have expected better tubing

          • We have different kinds of tubing available with us – regular ones, soft ones, and ones that go over one ear like a Bluetooth earpiece. Talk to our Oxygen Specialist for a free consultation, please give us a call at (877) 644-4581.

        • My wife just received her G5. The motor is quite, just a low hum but the that loud double popping/hiss every few seconds drives me right up a wall! The 1st one isn’t too terrible (compared to the following 2nd one) but the 2nd one right after the 1st pop is quite loud and annoying. I can hear it from the other side of our house in my office! It sounds like a tire just was punctured and all the air rushed out…..

          • Hello Tim, if you think the noise is abnormal, please contact the service department for support.

          • Is it a loud double popping sound/hiss every few seconds? To me while using the G5 it feels like two puffs of oxygen that occur when I exhale. And then when I inhale there is no puff of oxygen.

          • My g5 unit makes the same sound..Very annoying..Can’t believe this is a normal function..Does anyone own a G5 that doesn’t make that sound???

          • If you find the sound produced by your Inogen G5 unit to be bothersome or unusual, it’s a good idea to contact Inogen’s customer support or technical assistance to discuss the issue. They can provide guidance on whether the sound you’re experiencing is normal for the device or if there might be a potential issue with your specific unit.

        • Is it a loud double popping sound? To me it feels like two puffs of oxygen that occur when I exhale. And then when I inhale there is no puff of oxygen. It goes back to normal and then the two puffs again.

    • TOO MANY $$$. This “article” states…………With 6 liter flow settings, the Inogen One G5 gives you even more capacity for getting the oxygen you need during exercise so you can go farther without needing to limit your routine. WHICH IS A LIE! I was lied to and told the Inogen I purchased would go to 5 liters – when they do not make a machine that will even get to 1.5 liters!!!! They should be put out of business for lying to consumers like this! When I found out it wasn’t just me having a hard time using this thing – but tht they didn’t produce liters as stated, I wanted my money back! They wouldn’t do it. I WANT MY MONEY BACK!

      • I’m sorry to hear about your frustrating experience with the Inogen One G5 and the misinformation you received. If you feel that you were misled about the capabilities of the device and you are unsatisfied with your purchase, I recommend reaching out to Inogen directly to express your concerns and request a resolution.
        Also, we do not see a sales record in your name. If you believe, you purchased the unit from us, please call our customer service team.

    • Good article but everyone should know that “flow settings of 1 to 6 does NOT mean 1 to 6 LITERS! The highest setting of 6 is not quite 2 liters!

  1. My big question is, why can’t they make these portable ‘s smaller and lighter. With all the technology today, it should be possible. Keep wishing for that to come. Lower price too.

    • The manufacturers do make strides every year in making the oxygen concentrators smaller and lighter. It is due to the compressor that the size can be challenging. Please continue to visit our website for the latest information and technology.

    • We apologize, we are restricted by some of our manufacturers and not allowed to post pricing. Please call us at 1-877-774-9271 and we can provide pricing on all units.

      • I have owned a G5 since May 2019 and find that, while I am happy to have it, and it provides more freedom in respect to run times than the G4, which I also use, it does not actually provide the promised battery run times. My single battery lasts almost 5.3 hours (not 6.5) at the 2 setting for the G5. Sadly, my light weight G4 also doesn’t last as long as advertised, even with the channels newly replaced. This has been the experience of other users as well. Disappointing? Yes of course it is, however it still beats the old tanks of yesteryear! I have Alpha 1 COPD but with O2 I can travel, shop & extend my life, so in my view, it is still worth the $$$ spent. : )

        • Also an Alpha 1 patient. The inogen has been great for me, as Alannah writes the battery times are not at all as advertised. It would he nice to correct this info….I do like my Inogen products….wish someone would manufacture shorter cannulas …

          • If you mean the tube, rather than the bit in your nose, the solution is simple. You can get (free here in UK) connectors so that you can cut the tube to the required length and put a new connector on. Job done.

      • I’ve been given contradicting information from various sources. I simply need to know if the G5 can supply continuous flow on level 3? Continuous flow on 3 is a must. Than you for any information you can share! Judee P.

        • Hello Judee, Inogen One G5 can supply up to a setting on 6 on pulse flow (not continuous flow). Pulse flow is different than continuous flow as it supplies the oxygen in puffs of air at inhalation. If a continuous flow of 3LPM is a must and you are looking for a portable solution then the only option available is the powerful SeQual Eclipse 5. Click here to learn more.
          If you are looking for a comparable option in pulse flow, as pulse flow units are lighter, check with your physician what pulse flow setting will meet your requirement.
          PS: We have some specials going on for SeQual Eclipse 5. You can call us at (877) 644-4581 if you have any questions.

          • No, I don’t think so. According to the user and provider documentation It’s rated at ml/min not L/min. 210 ml/min for each setting. setting 6 is 210×6=1260 ml/min. 1260 ml/min equals 1.26 L/min. Which is why I’m contacting my wifes Dr this week. They said she’s suppose to be on 2 L per min and this only puts out 1.26 maximum. Unless because it’s a pulse flow it’s different but I can’t get anyone to tell me what 2 L per min would be in a pulse flow device.

        • Please ensure that the unit is plugged into a properly earthed wall outlet. Electronics may hmm when the earthing is not ok.
          Also, try charging it in your car and see if the hmm goes away.

  2. I’m on 6 liters and this may be what I need to leave the tanks behind. What’s realistic bat time using 6? I had an earlier Inogen back when I just needed 2liters. It didn’t hold up too well, so Im a little leery along with my excitement about getting truly mobile again.

    • Hello Greg,
      The output of the G5 on the setting of 6 is not liters per minute but increases the volume of the pulse or bolus of oxygen. I do recognize it can be confusing with the setting usage and the Liters per minute needed by continuous flow machines. Also the battery chart that Inogen provides shows the battery run time for a standard battery at a setting of 6 to be 1:26 and with an extended battery to be 2:58. As with any machine that uses batteries, the run time and battery can be slightly better or less the run times are an average. I do hope this helps you Greg. All the Best.

    • Be careful these machines are being misrepresented by the sales people they say they will put out 1 to 6 L per minute they do not I just got out of the hospital and in the hospital I was on 2 L per minute on rest at rest and I could maintain an oxygen level of 95 if I got up to use the bathroom I would have to put it on 4 L and when I would come back To the bed I would be at 79 to 80 on my oxygen meter and on 4 L it would take me about three minutes to get back to 95 I switched to the G5 put it on six for two hours and could not get above 80 on my meter these machines do not put out 6 L liters a minute

      • that’s because they are rated at ml/min. Not L/min. We are having the same issue with my wife who is suppose to be on 2 L/min but this will only put out 1.26 L/min max. on stting 6 (if you convert the 1260 ml/min to L/min.)

  3. Are we ever going to be able to do continuous flow as opposed to that nuisance pulse dose?
    Is Medicare finally covering the cost of these units?

    • Hi Edward, The technology required for continuous flow is unable to be achieved in a smaller machine yet. As for Medicare covering units, this has not seen any changes and will still need people to work directly with their provider and coverage if the machine is covered or not. I do hope this helps. All the best!

      • Oxygen saturation going down after using an oxygen concentrator is counter-intuitive. What was his oxygen sat before using the machine? If you believe he is not getting proper oxygen saturation, please contact your healthcare provider to determine proper oxygen dosage.

      • This is dangerous. Continuous blood oxy levels under 88 require medical treatment. Readings in low 80s to 70 can cause brain, heart and kidney damage if that level is allowed to persist. Please contact your doctor or pulmonolgist ASAP.

  4. We have been researching various machines for some time now and we checked with our Pulmonologist. My wife is currently on 4 liters continuous flow at home and the same on our portable C tanks on the go. You can see that our time is very limited by the C tank capacity at the current flow rate. Is there a reason why none of the portable units on the market do not have a contnuous flow setting feature besides the battery life issue? Our Pulmonologists states we do not qualify for a potable unit because I require a continuous flow setting of 4. Pulse settings will not keep up with my demand. The concentrator companies are very reluctant to advise you that these devices are not capable of fulfilling your needs when on continuous flow. Our Pulmonologists is not. We just want a little more freedom to function outside the home. Thank you for your anticipated response in this matter.
    Ray & Mary Catherine

    • Hi Ray, I do emphasize with you and many others who have conditions that are beyond the concentrator’s functionality. Needing a portable continuous 4 LPM option is more than any machine on the market are able to get. The one that comes to mind is the Eclipse 5 which can deliver upto 3 LPM. You are correct that it comes down to power and the technology to create and deliver the amount of oxygen and a smaller size. To continue to shrink and make a portable option to what a home continuous concentrator does would be a great advance and benefit many. Like you, I hope that those who work on such problems will be able to create this solution soon. I do wish you and Mary Catherine the best.

    • Hi George the G5 is a pulse dose machine with a setting of 6 but this is not a continuous flow machine. Sorry if there confusion in the review that it provides this feature.

    • Hi Eugenia, The Inogen G5 does have a setting of 6 but this is not a liters of oxygen setting but a setting on the volume and frequency the machine can deliver. So the Inogen G5 does not provide 6 liters per minute which I apologize for the confusion.

      • So, I have read all of these comments, and I have looked at the specs, and it doesn’t say anywhere what the actual liter flow is on pulse or on constant. Can you please just tell me the actual max liter flow per minute on a pulse dose and on a constant dose setting? We just burned through three units of another small portable machine that claimed a level 5(which only produced a 1.5 liter flow per minute), and it has caused a huge decline in health! We can’t make the same mistake this time.

        • Hi Gigi,
          Thanks for your comment. Continuous liter flow cannot be compared apples to apples with a pulse-dose flow. The reason is that continuous flow delivers oxygen irrespective of the user’s breathing pattern. Whereas, a pulse-dose machine delivers oxygen whenever the user breaths, meaning that pulse-dose oxygen enables higher oxygen consumption.
          Only your healthcare provider can determine if a pulse-dose machine is suitable for you and at what “setting” of pulse.
          If you must purchase a continuous flow portable oxygen concentrator, we have Respironics SimplyGo which produces up to 2 LPM on continuous flow, and SeQual Eclipse 5 which produces up to 3 LPM on continuous flow. Both of these machines also feature pulse-dose mode.
          Our Oxygen Specialist would be happy to help you out with your requirements. Please give us a call at (877) 644-4581.

    • Hi Waide, I wish I had that answer as well! Knowing that home machines can deliver this, it comes down to portability of the technology and the ability for a battery source to maintain the output. If you have seen the eclipse 5 and the size that it is to deliver 3 liters per minute, this is where the current technology has gotten us. We can only hope that the smart minds at the companies like Phillips and Inogen are working on that very thing. But currently, I am unaware of any timeline for this innovation. Hope all is well with you. All the Best.

  5. I have used both the G3 for 5 years and the G4 for 3 years. It is nice to have the smaller G4 but I have always found the G4 to be very fragile and it gets overheated easily and only getting about 2 hours per battery on 2 liters does not take me too far. The G3 has been my go to machine but it is heavy. What is the weight of the G5 with the 13 hour battery and what is the cost? Sincerely, Sr. Anne Marie Holden

    • Hi Sister Anne Marie, Glad the G3 works well for you. It is a reliable machine. As to your questions regarding the new G5, the information from the manual indicate the battery run time for an extended battery on a setting of 2 is 10:22 which is an average time for the batter. The weight of the G5 with a standard batter is listed at 4.7 pounds. So with an extended battery it would be a few pounds more. The price of a G5 with a standard battery is listed at $2395. I do hope this helps you. All the Best.

  6. Is the G5 airline approved? Are any of the batteries from G3 interchangeable? How heavy is the G5? And is it medicare approved? And how expensive is it? Do you take trade-ins?

    • Hi April, The G5 is FAA approved. but the question about the batteries, the G5 has their own battery pack design which will require new batteries. I am unaware of what Medicare has done regarding the G5. And yes we do take trade-ins! Give our BuyBack team a call at 844-327-2154 and they can help you facilitate the trade-in. Hope this helps!

    • Hi Nancy, If you are on a continuous oxygen prescription, then the G5 will be unable to meet your needs. If you are on a Pulse prescription then yes the machine is made to help you and can be used for oxygen on a pulse setting. It can be used both with a battery or plugged into a wall (or car charger). I hope this helps!

    • Hi Karen, the G4 batteries will not work with the G5 which requires there own battery design. Yes! we do take trade-ins. If you want to do this contact our BuyBack team at 844-327-2154 and they can explain the process and help you with trading in you G4. Hope this helps.

      • It appear$ to me that this machine is mo$tly designed to extract a maximum dollar payback to inogen’$ bank balance! I see this wherever they try to get away with half-truth$ and wea$el words. They use their s$etting$ to try and convince us that the “2” $etting is equivelent to 2 liter$ continuou$, when it definitely i$ not. Other wea$el word$ are when the will not tell u$ the true price of OVER THREE THUSAND DOLLAR$ for the unit. It i$ the old “if you can’t dazzle them with brilliance, then baffle them with bull$hit” routine. They are quite adamant to get you to speak to their commi$$in high $ell$ pre$$ure team whose main objective is $ale$ commission$ (in my opinion.)

        I bought my new inogen one g5 ju$t a couple month$ ago and I already had to replace the columns for $130 (including delivery). Al$o have noticed that my oxygen level$ are not well maintained while walking even when u$ing a Walker. After $eeing the tactic$ inogen use$, I can unders$tand why our s$ocial $ecurity i$ in danger. To me, it is ju$t one more proof that greedy companie$ i$ where it is failing, and I believe Inogen is one more example of it !

        Ye$, I am angry and I feel cheated out of my hard earned cash. Also everywhere I looked while researching this buy, it has been seen where this company has obscured any comments like mine. BEWARE OF THESE PEOPLE !

        • I’m sorry to hear that you’ve had a negative experience with your Inogen One G5 and feel that the company is more focused on profit than providing quality products and service. It’s important for companies to be transparent and honest with their customers about the performance and cost of their products. Inogen is one of the most popular and reliable concentrator brands out there.

          If you’re experiencing issues with your oxygen levels not being maintained while walking, it may be worth contacting Inogen customer support to troubleshoot the issue or consider speaking with your healthcare provider about adjusting your oxygen settings.

  7. Please identify the capabilities of the G5 for pulse and continuous flow. I found the review very confusing. It is always critical to know when you are referring to pulse vs continuous flow. I’m only interested in finding a powerful continuous flow portable concentrator.

  8. I understand that there have been a lot of problems with the G5 right out of the box and that many have had to be returned. What do you know about the return rate? I know my provider won’t handle them until the bugs are worked out…….

    • As a new product, the working out of problems can occur. As the G5 is new to the market, stories related to needing to return some is going to be posted. I have not received any information on the return rate on the G5 at this time so can not provide you with any different information that you may have. But as Inogen is a leader in oxygen concentrators, I trust they are being diligent in addressing the returns that have happened. Hope this helps.

  9. Any portable number such as 5 is not liters. Stationary concentrators deliver in liters; portables say 5 but that is just a number, not liters.

  10. There is nothing on Inogen’s website comparing the G5 to the G2, which I am using now. I understand that the G2 has been discontinued, and I have read that the G5 is an improved G2. Do you know how setting 6 on the G5 differs from setting 6 on the G2?

    • The G5 has output numbers identical to the G2 – maximum output of 1.26 liters per minute and bolus size of 84 ml at pulse 6 and 15 breaths per minute. But the G5 is about 2 pounds lighter and as Ryan Anthony’s review points out, it has more output than the G3 with a smaller size and weight – so I think we can consider the G5 a replacement for the G2 and G3. The G4 is a different case – it is the category of lighter POCs with very low oxygen output.

    • We offer a 5 day risk free trial on the Inogen G5. The G5 is not currently available for rental – please call us at: 1-877-644-4581 for more information on the G5 and our free trial.

  11. 1. Why was the Inogen One G2 discontinued?
    2. I am presently renting a POC from my oxygen supplier. It is being paid by my insurance. I am thinking about purchasing my own POC. I’ve been using the G2 for several years and it works very well, no kinks.
    I hesitate to purchase a G5 because it is too new and their may be issues with it.

    • The Inogen G2 was discontinued because of the release of the Inogen G5. However, please give us a call at 1-877-644-4581 and we can walk through options with you and ensure that we find you the best concentrator for your needs.

  12. I am about to go on the G5 thru Medicare. I have never been on oxygen so I am wondering how careful I have to be when around a candle, or our fireplace. If you could provide me with some information I would greatly appreciate it.

    • Dear Van,

      Portable oxygen machines are much less flammable than traditional oxygen tanks as they are not “filled” with pure oxygen, however we recommend keeping your machine a safe distance away from open flame. Keeping at least 5ft away from any open flame is best.

      Sincerely,
      The AMSR Team

  13. I recently purchased a Inogen One G-5 and I’m concerned about charging the batteries. I watched a YouTube video about the G-4 and the individual said NOT to over charge the batteries as it may damage the machine or the battery. The manual I received with the G-5 said you could leave it charging over night. I take it that the newer battery is different. I just don’t want to ruin the machine or the battery. What do you say?

    • It is perfectly safe to leave the battery on and the machine charging overnight. To keep your batteries working longer (on any portable machine) we recommend charging your batteries fully to 100%, then running them down to almost an empty battery.

  14. With the G5 on the 6L pulse dose, whether it be with the single or double battery, the AC/DC adapter will it charge the battery while using the system? Not sure if thats clear, for example, I grab my POC to run an errand or visit a friend…I check my battery its low. I grab the AC/DC adapter and plug into the car or plug into an outlet at my friends house, will the battery charge while I’m using the G5? I was assured by an Inogen Rep the unit (batteries) would charge while using the adapters. My pulmonologist ofc said no it won’t charge the battery in that type of scenario. That is a big factor to consider for anyone on oxygen interested in purchasing this unit. I’ve been on O2 for 6.5 years, the cannisters are cumbersome. If you want to visit family in another state, your drive time round trip is 2hrs, plus the visit, these are worrisome problems anyone on oxygen faces.

    • Yes, you can use the Inogen G5 while the unit is charging using AC or DC power. However, at the setting of 6, charging might take a longer time.
      Nevertheless, you can carry a second battery with you and switch it when the first one is running low. There also an external battery charger available which you can use to charge the battery not-in-use. It’s a good idea to label your batteries A, B, and C or name them if you wish. View available Accessories Available for Inogen One G5.

  15. I like the sound of the G-5 but I hate to lay out that much cash and then find out it won’t fit in my wife’s oxygen program. She is on 2.8 up to 3.8 liters 24/7 and it makes travel very difficult. I tried the smaller inogen some time ago and it over heated while charging in the car so if you have any up date to this problem I am still interested.

    • Inogen G5 is much powerful than its counterparts. Our Oxygen Specialists would be happy to understand your requirements and advise the way forward. Please give us a call at 877-644-4581.

  16. I received a G 5 a few days ago for my wife. We have only been able to get approximately 3 hours out of the battery, running it on 2, but the advertisement says the single battery will get 61/2 hours and the double battery will get 13 hours. Also, the unit makes somewhat of a popping and crackling sound while running, that is very audible and a distraction to those setting near us at church. It also puts out a spewing or hissing sound as well. It was my understanding that the new G 5 Unit was to run quietly. Please advise ASAP, Bob Moore

    • Bob, sorry about the issues you are having with your G5, if you would please give us a call at 877-644-4581, we would be happy discuss the run times per battery and help you with any other issues you are having with the machine.

  17. You mention setting #’s but you do NOT state what the real liter setting is on the G4 or G5. Those numbers mean nothing they could use a,d.r.t.e and mean just as much! What is the bolus size per breath? What are the Max breaths per minute? What is the real total amount of 02 each of those machines can produce. That is the real i formation an expert should be giving people. Please respond to my email address with the maximum output for each of those machines in real liter amounts
    Thank you so much

    • Oxygen volume at various flow setting on Inogen G5 and Inogen G4:

      Inogen One G5 (Total output per minute)
      Setting of 1: 210 ml/min (bolus size is 10.5 ml/breath for 20 breaths per minute)
      Setting of 2: 420 ml/min
      Setting of 3: 630 ml/min
      Setting of 4: 840 ml/min
      Setting of 5: 1050 ml/min
      Setting of 6: 1260 ml/min

      Inogen One G4 (Total output per minute)
      Setting of 1: 210 ml/min (bolus size is 21 ml/breath for 10 breaths per minute)
      Setting of 2: 420 ml/min
      Setting of 3: 630 ml/min

      The bolus size will adjust itself to deliver the same total volume per minute. Bolus size increases when there are fewer breaths per minute and decreases when there are more breaths in a minute.

        • If you convert ml to liters directly, 1,260 ml is 1.26 liters. However, this conversion should not be used to determine a pulse-mode oxygen concentrator equivalent to the continuous-flow oxygen concentrator. Continuous flow supplies the oxygen continuously whereas pulse dose mode supplies oxygen right at the patient’s inhalation. This key difference between both oxygen delivery systems doesn’t allow apples to apples comparison. It should be your healthcare provider who determines what pulse setting should you administer your supplemental oxygen at.

    • Agree with you Paul. Have learned that the setting numbers mean nothing. Find a conversion chart for ml to l and it is amazing how little O2 you get on setting 6!

      • Hi Terry,
        The pulse dose oxygen concentrators cannot directly be compared with continuous flow oxygen concentrators. Pulse dose supplies oxygen right at the user’s inhalation so most of the oxygen supplied is inhaled. While on the continuous flow, the machine supplies oxygen continuously, irrespective of the user’s inhalation. Thus, on continuous flow, there’d be lesser utilization of oxygen supplied.
        For instance, if the User A gets 2,000 ml (2 liters) of oxygen on pulse dose mode and User B gets 2 liters on the continuous flow mode, then User A is consuming more of the supplied oxygen than User B.
        Lastly, it should be your doctor who prescribes pulse dose (and its settings) or continuous flow (and its liter flow).

  18. I just received my G5 less than a month ago and have nothing but problems with it. I wish that I have waited for the kinks to be ironed out before I had pick out this unit.

    • We are sorry to hear of the issues you are having; please give us a call at 877-644-4581 so we can try to help you iron out the kinks. Or, we can discuss other options for you.

  19. I agree with most of your comments. however the weight of a G5 with a double battery is almost 7 lbs. A lot more weight to haul around than the G4.

    • Hi Terry,
      In terms of oxygen supply, Inogen G4 and G5 vary. Inogen G4 can supply oxygen up to a setting of 3 whereas Inogen G5 can supply oxygen up to a setting of 6. In order to produce more oxygen and support more power consumption, Inogen G5 and its battery are a little heavier than Inogen G4. To meet the oxygen requirement is the number one consideration while purchasing the unit. So, if Inogen G4 can’t fulfill the oxygen requirements, patients opt for Inogen G3 or Inogen G5.
      You are correct that Inogen G5 feels a little weighty than G4. However, with technological advancements, portable oxygen concentrators are getting lighter and more powerful.

  20. Do you happen to purchase extended life batteries and an external charger from a Phillips Respironics Simplygo mini? Also, if I am on a 2L pulse flow during the day(all day), will this machine meet my oxygen needs? I can only get one machine every 5 years, so I need this to last.

    • Hi Gigi,
      Inogen One G5 and Respironics SimplyGo Mini are two machines from different manufacturers. Both of these machines have their standard and extended batteries. We can quickly answer all your questions over a phone call. Please reach us out at (888) 387-5914. We are open seven days a week.

    • Inogen G5 is the latest portable oxygen concentrator from Inogen. It not going away anytime soon. We have a fall sale going on currently. We can quickly answer all your questions over a phone call. Please reach us out at (888) 387-5914. We are open seven days a week.

    • One way to do this would be to use the Inogen Connect App and verify. Inogen G5 is the latest model, rest assured you’ll get the updated model. Our Oxygen Specialist would be happy to help you out with your requirements. Please give us a call at (888) 572-5831.

  21. Hi, my father who is on 2.5L continious flow would like to use the Inogen G5. What pulse flow setting should my father use (1-6)? Thanks a lot!!
    Ronnie

    • Hi Ronnie, we cannot give any medical advice; please consult with your physician or health care provider. They are the qualified experts to prescribe the correct pulse dose.

  22. Are there refurbished One G3 machines for sale? I have one that is two years old and I worry it won’t make it to five years as I can afford in my budget since it is used 16 hours a day on 3-4 settings. I can’t afford a new or refurbished model yet and my current one is doing fine so far. I just worry since I am so dependent on it and need to be thinking of the worst that can happen and how to pay for it.

    • Thank you for your inquiry. I have passed along your information to a specialist who will reach out regarding your request. For more immediate assistance feel free to give our specialists a call at (888) 360-9628 or if you prefer email sales@amsrco.com

  23. I live in the UK, and have just started using the Inogen G5. My prescribed level of use is 5, which gives me just over 2 hours use on the small battery. I managed to get a second battery, but you cannot charge the spare from the machine whilst it is being used. Answer….get a separate charger. What a rip-off!! Buying a cordless drill or a mobile phone gets you a charger for free, but Inogen want $285 US + shipping which comes to £305 UK. Does anyone make a cheaper model that will fit a G5 battery?

    • Please give us a call at +1 (877) 644-4581 to see if we have got something in our recertified inventory that’ll work for you.

  24. Can my g3 external battery charger be used on a G5? Can my G3 car charger be used on the G5? If not do you have a trade-in program that I can trade in my two double batteries for the G3 and get some credit that I can use for buying double batteries for the G5 I’m going to get?

    • Hello Bill, G3 external battery charger cannot be used on G5. However, you can use the car charger (DC power cord). We have a buyback program for units, we do not accept accessories separately. Learn more about the Buyback Program.

    • Inogen G5 is a pulse-dose-only unit and can go up to a setting of 6. At the setting of 6, it supplies 1260 ml/min and that is in pulse dose so can’t be compared directly to continuous flow.

      • but it can be compared if you use a 50/50 inhale/exhale ratio, making setting 6 equal to 2.5L continuous. If you wanna believe the 1/3 rule, which no one in the respiratory field believes, maybe 3.6L

    • Inogen G5 cannot be used by 2 persons at the same time. Inogen G5 is a pulse-dose unit and its oxygen delivery is triggered by breath detection. The unit will throw an error since the breath detection won’t work properly.
      Nevertheless, continuous flow units can be used by two persons at a time. However, note that the oxygen flow will be halved since the flow is divided between two users. For example, on 4 LPM, the users will receive 2 LPM each. If you are interested in Inogen, there is ‘Inogen at Home 5L’ that provides continuous flow up to 5 LPM. You can check all home units and see which one will meet your requirements. And if you are interested in a portable unit, check Caire Eclipse 5 and Philips Respironics SimplyGo.

  25. We had another brand portable concentrator that we purchased. After 1.5 years and 3 replacements we were told that the unit was not meant for our needs. But only for occasionally going to a doctors appt, store visit etc. Our needs would be to use a portable concentrator for 6 – 8 hours a day with a setting of 2. Will this unit withstand this type of use?

    Thanks

    • Inogens can withstand 24/7 usage. Our Oxygen Specialist would be happy to help you out with your requirements. Please give us a call at (877) 644-4581.

  26. I purchased an Inogen One G5 in November 2019 I am waiting for my 11th replacement I received # 10 July 1, 2022 and it stopped making oxygen July 2, 2022 I called customer service and they could not send me another replacement until July 6, because of the holiday, I explained that I needed it July 5, because my wife was having heart surgery July 6, there comment was that they would have there supervisor call me back. I haven’t heard back from them.

    • It’s unfortunate that that happened.
      Which company were you dealing with? We do not have a file under your name.

  27. I just purchased the G5 for a long trip, so I have 2 double batteries. I am thin, 5’ tall, with pre-existing lumbar, thoracic & cervical spine problems. The backpack is the best option for me orthopedically but the inogen backpack doesn’t fit me or provide the proper support. The unit is too heavy for me to use with the shoulder strap & the cart won’t work for me on stairs & hills.I can carry the extra battery & accessories separately. Do you have a recommendation? Thank you

    • Our Oxygen Specialists would be happy to understand your requirements and advise the way forward. Please give us a call at (877) 644-4581.

  28. So is this G5 capable of providing enough O2 to someone who needs 2 L/min? The G5 is a pulse unit v.s. a cont. unit but I can’t find anywhere how to convert 2L/min to a pulse unit. At setting 6 the G5 only produces 1260 ml/min which equates to 1.26 L/min but it’s a pulse unit. Even when I contacted my wife’s pumonary Dr office they don’t seem to know either….sigh! They said she was suppose to be on 2 L/min but ordered her the G5 and a Devbliss home unit which is a cont. flow unit. The home unit is set to 2L/min and she does much better on it than the G5. So….. if you need 2 L/min cont. can this unit get you there in a pulse flow setting? I’m thinking no it can’t.

  29. My mother purchased a G5 directly from Inogen in April 2023. Shortly after using, an O2 down arrow error message appeared. Evidently, this means that the concentrator is not producing enough oxygen. My mother is now on her 4th G5 unit (the original and 3 replacements) because of this same error. This 4th unit is now giving her the same error message. This is occurring after about 2 weeks of use. We have not been able to get an answer from Inogen as to the reasons for this constant error message. They just send a new unit. Has anyone else had this problem? Is there a fix?

    • I’m sorry to hear about the repeated issues your mother has been facing with the Inogen G5 units. It’s indeed frustrating to encounter the same error message multiple times. While I cannot diagnose the specific cause of the error, I can offer some general advice that might help:

      1. Environmental Factors: Check if there are any environmental factors that could be affecting the performance of the concentrator. Dust, dirt, or high humidity levels might impact the functioning of the device. Make sure the unit is kept in a clean and well-ventilated area.

      2. Proper Usage: Ensure that the concentrator is being used according to the manufacturer’s guidelines. Check the user manual for instructions on setup, usage, and maintenance. Incorrect usage could lead to performance issues.

      3. Filters and Maintenance: Regularly clean and replace the filters as recommended by the manufacturer. Dirty filters can affect the air intake and output of the concentrator, potentially leading to errors.

      4. Positioning: Make sure the concentrator has proper airflow and is not placed near walls or objects that could block ventilation. Proper positioning can help prevent overheating or airflow issues.

      5. Power Source: Ensure that the concentrator is connected to a stable power source. Voltage fluctuations or power surges might affect its performance.

      6. Altitude Considerations: If your mother is using the concentrator at high altitudes, it’s important to check if the unit is designed to operate effectively at those altitudes.

      Remember that while these suggestions can be helpful, it’s important to rely on the expertise of the manufacturer and qualified medical professionals when dealing with medical equipment.

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