Founded in 2001, California-based Inogen manufactures and distributes medical equipment including both at-home and portable oxygen concentrators. Inogen’s portable oxygen concentrators have been clinically validated through research, development, and testing for 24/7 use.

The Good

  • Lifetime Warranty
  • Device Options
  • First-Time Patient Resources

Lifetime Warranty

Inogen is one of the few portable oxygen concentrator companies that offer a lifetime warranty on its products. Though the default warranty is three years at the base price, Inogen sells a number of different “Freedom Packages” that provide customization for the needs and preferences of the patient.

For example, a customer can purchase the Inogen One G4 oxygen concentrator for $2,295 with a 3-year warranty or the customer can upgrade to the next tier up for an additional battery and a lifetime warranty on the device for $3,195.

All oxygen concentrators, regardless of the package purchased, are eligible for a 30-day, risk-free trial and free shipping.

Device Options

Inogen sells a larger-capacity at-home oxygen concentrator that is relatively lightweight, small, and quiet compared to other at-home systems. Patients requiring constant oxygen may want to consider the at-home system in addition to a portable concentrator so they don’t have to worry about charging the portable system’s battery as frequently.

The company's Inogen One G3 has five oxygen flow settings, weighs 4.8 lbs, and has a battery life capacity up to 10 hours. The Inogen One G4 has three oxygen flow settings, weighs 2.8 lbs, has a battery life capacity up to 10 hours, and meets the FAA requirements for air travel. The G4 is one of the lightest POC on the market. Their latest model, the Inogen One G5, weighs 4.7 lbs, has six flow settings, meets FAA requirements, and lasts up to 6.5 hours with a single battery (up to 13 hours with a double battery).
All three Inogen concentrators have an LCD screen that displays battery life and an AC/DC power supply.
Patients can also choose to purchase a G4 or G5 package with a double battery, app connection, and Bluetooth capability.

First-Time Patient Resources

The Inogen website provides a thorough introduction to the benefits of oxygen concentrators, the safety of the devices, and answers to frequently asked questions about oxygen therapy and portable oxygen concentrators specifically. Prospective customers can request an even more detailed information kit for free.

The Bad

  • No Financing Available

No Financing Available

Inogen does not appear to provide payment plans for the purchase of any of its oxygen concentrators. Each product must be paid for in full at the time of sale.

The Bottom Line

Inogen has made an effort to get its portable oxygen concentrators tested for peer-reviewed and published research about its ability to provide oxygen efficiently both night and day for most patients. It offers an at-home oxygen concentrator if a combination of portable and at-home solutions are deemed best for a patient.

The best selling point of this company, though, is the option to upgrade to a lifetime warranty. That’s simply not an option in most other portable oxygen concentrator companies. For such a large investment in medical equipment, it’s worth the extra money to get your device covered for a lifetime rather than the default three years.


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