Used Oxygen Concentrator Buying Guide

Used Oxygen Concentrator Buying Guide

We carry refurbished, gently used oxygen concentrators of only the best, most reliable, and low maintenance oxygen concentrators in the industry. If you need to adhere to a tight budget when shopping for a portable or a home oxygen concentrator, take a look at what we have in our used stock. Our highly trained service technicians do a 30-point concentrator inspection before certifying each used concentrator. Key inspection points our technicians check: gasket seals, values and piston cups, compressor, motor mounts; as well as cleaning components and replacing all filters.

How to Choose an Used Oxygen Concentrator

You must first narrow your selection down to which concentrators will cover your oxygen needs as prescribed by your doctor. Decide if you want/need a portable oxygen concentrator, which you can take with you while traveling, or if you will be staying at home while receiving oxygen therapy. If you are buying a used portable model, consider the weight and the battery life. For a home concentrator, consider the energy consumption.

Used Prices are determined by:
  • Amount of hours on the machine
  • Available warranty on the machine
  • Age of the machine

  • Used Brands Available:
  • Pre-Owned CAIRE Units
  • Pre-Owned Philips Units
  • Pre-Owned Inogen Units
  • Pre-Owned OxyGo Units
  • Pre-Owned Invacare Units
  • Pre-Owned DeVilbiss Units
  • Pre-Owned O2 Concepts Units


  • Used Portable Models

    Used Respironics Mini The Used Respironics SimplyGo Mini can provide users with unrivaled oxygen freedom. This unit weighs only 5 pounds with the standard battery and delivers pulse dose settings between 1 and 5, allowing users to stay active and on the go while still getting the oxygen therapy they need. Learn more about the Pre-Owned Respironics SimplyGo Mini.

    Used CAIRE Freestyle Comfort The Used CAIRE Freestyle Comfort weighs 5 pounds and features an ergonomic design that rests naturally against the curves of your body. This unit features a simple, one-touch operation, a color interface, and a long-lasting battery. It also utilizes UltraSense sensitive breath detection technology to ensure oxygen is delivered to you when you need it. Learn more about the Pre-Owned CAIRE Comfort.

    Used Respironics SimplyGo The Used Respironics SimplyGo is a lightweight, user-friendly, and compact unit that makes it an excellent choice for most oxygen users, including extremely active ones. The unit delivers up to 2 LPM on the continuous flow setting up to a setting of 6 on pulse dose. Learn more about the Pre-Owned Respironics SimplyGo.

    Used Inogen One G4 The Used Inogen One G4 can provide oxygen delivery in an unbelievable small and quiet package. With flow settings from 1-to 3, the unit is designed to increase independence for most users 24/7. Learn more about the Pre-Owned Inogen G4.

    Used Inogen One G5 The Used Inogen G5 is a robust and versatile concentrator that provides 1 to 6 flow settings in a lightweight design weighing less than 5 pounds. It also features a long battery life, a large and user-friendly LCD screen, and quiet operation. Utilizing Intelligent Delivery Technology, the unit provides oxygen delivery of 1260 ml. Learn more about the Pre-Owned Inogen G5.

    Used CAIRE SeQual Eclipse 5 The Used SeQual Eclipse 5 is Fully-Tested and has the same great features, oxygen settings, and battery life as the previous Eclipse model, with better overall power and the ability to run on DC power and charge at the same time. Learn more about the Pre-Owned CAIRE Eclipse 5.

    Additional Used Portable Concentrators
  • Used OxyGo Fit
  • Used OxyGo Next
  • Used Inogen One G3
  • Used Belluscura XPlor
  • Refurbushed AirSep Focus
  • Used Invacare Platinum Mobile
  • Used DeVilbiss iGo 2
  • Used O2 Concepts Freedom
  • Used ARYA
  • Used GCE Zen-O Lite
  • Used GCE Zen-O

  • Discontinued Used Portable Concentrators
  • Used CAIRE SeQual Eclipse 3
  • Used O2 Concepts OxLife
  • Used Inogen One G2
  • Used AirSep FreeStyle 5
  • Used AirSep FreeStyle 3
  • Used DeVilbiss iGO
  • Used Inova Labs Lifechoice
  • Used Invacare XPO2
  • Used Invacare Solo 2
  • Used ResMed Mobi

  • Used Home Models

    Used CAIRE Companion 5: The Used CAIRE Companion 5 stationary oxygen concentrator is designed for simplicity, ease of use, and low maintenance, making it an ideal solution for receiving oxygen therapy at home. Each unit features autoFLOW technology and ultraSilent technology. The Compaion provides 1 to 5 LPM and weighs 36, making it one of the lightest home concentrators. Learn more about the Pre-Owned CAIRE Companion 5.

    Used Respironics EverFlo: The EverFlo is one of our best deals for a used home oxygen concentrator. This Pre-Owned unit delivers 0.5 and 5 LPM of continuous flow oxygen and weighs around 31 pounds. It is fully-tested and the design features combine quiet operation, compact design, and low maintenance into a single unit. Learn more about the Pre-Owned Respironics EverFlo.

    Used Inogen at Home 5L: Weighing only 18 pounds, the Used Inogen At Home oxygen concentrator is the smallest and lightest-weight home concentrator available. Its compact shape was designed to be discrete and easily transportable. This unit consumes less electricity, allowing you to save up to $300 per year. Learn more about the Pre-Owned Inogen at Home 5L.

    Used Invacare Perfecto 2 This compact and quiet unit can put out oxygen between 1 and 5 LPM and is one of our most energy efficient. With minimal use and a 2 year, 4 month warranty on parts and labor, this is a great deal on a used home concentrator. It still runs like a champ at an altitude of 10,000 feet above sea level and at temperatures as high as 95 degrees Fahrenheit. It also features a built in handle at the top of the cabinet so you can easily wheel it to a different area of your home. Learn more about the Pre-Owned Invacare Perfecto 2.

    Used CAIRE AirSep NewLife Intensity The Used CAIRE AirSep Newlife Intensity 10 delivers 10 LPM of high pressure and high flow oxygen in a unit weighing 50 pounds. Entirely serviced and rebuilt, this home concentrator uses only 350 watts, making it one of our most energy-efficient used models. Learn more about the Pre-Owned CAIRE NewLife Intensity.

    Used Respironics M10 The Used Respironics Millennium M10 is the highest performing and most reliable high-flow 10 LPM oxygen machine available. The unit reduces the cost of providing oxygen at a higher liter flow. Learn more about the Pre-Owned Respironics M10.

    Additional Used Home Concentrators
  • Used Drive DeVilbiss 10L
  • Used Invacare Platinum 10

  • Discontinued Used Home Concentrators
  • Used DeVilbiss 525
  • Used SeQual Integra
  • Used Puritan Bennett


  • Used Concentrator Glossary

  • Pulse Dose Generally a setting featured in portable oxygen concentrators. This is a puff of air (also known as a bolus), released when the machine senses negative air pressure when you are about to take a breath.
  • Continuous Flow: Featured in some portable models and in all home concentrators. The air from the machine is flowing at a constant rate through the mask or cannula.
  • LPM: The unit in which the flow of oxygen is measured.
  • Varying hours of use: Some of our used models have been used longer than others.
  • Varying warranties: Some of our used concentrators have warranties that will soon expire, or still have there original 3 year warranty.
  • Parts and labor warranty: Our refurbished units may come warranty, which covers any labor and parts that it may need for the 90 days after you've purchased it.



  • Updated: May 21, 2022

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