If you are searching for a 5 litre oxygen concentrator price in Pakistan, you have probably noticed that machines are sold as 3L, 5L and 10L. Many families assume a bigger number simply means a better machine. In reality, the right size depends on the oxygen flow your doctor has prescribed, not on the biggest number on the box. This guide explains what those litre ratings mean in plain language.
What Does “Litres” Mean on an Oxygen Concentrator?
The number refers to the maximum flow rate in litres per minute (LPM) the machine can deliver. A 5L concentrator can supply up to 5 litres of oxygen-enriched air every minute. It does not mean the machine stores 5 litres, and it does not mean you must run it at the maximum setting. Most people use a lower flow, such as 1 to 3 LPM, depending on their prescription.
Concentrators work by taking in room air, filtering out most of the nitrogen, and delivering air with a higher oxygen concentration through a nasal cannula or mask. Unlike a cylinder, they do not run out as long as there is electricity.
3L Oxygen Concentrators: Lower Flow Needs
A 3L machine is designed for people whose doctor has prescribed a low flow, often up to about 2 to 3 LPM. These units are typically lighter, quieter and use less power, which makes them practical for a bedroom or a single-patient home. Note that when you push any concentrator close to its maximum flow, the oxygen concentration it delivers can drop. For this reason it is wise to choose a machine whose limit sits comfortably above your prescribed flow.
5L Oxygen Concentrators: The Most Common Home Choice
The 5L model is the most widely used size for home oxygen therapy. It covers a broad range of prescriptions and leaves headroom if a doctor increases the flow later. This is why searches for a 5 litre oxygen concentrator price in Pakistan and the general oxygen machine price are so common. Many families also prefer 5L because it can be used with a humidifier bottle and a standard nasal cannula for long daily use.
10L Oxygen Concentrators: Higher Flow Situations
A 10L concentrator can deliver a much higher flow and is used when a doctor specifically prescribes it, or in settings where more than one person may need support, such as a clinic. Some 10L machines can split flow between two outlets, but the total flow is shared, so two patients each on 5 LPM would use the full capacity. These machines are larger, heavier and louder, and they draw more electricity, which matters during load-shedding. For most households, 10L is more than is required.
How Is the Right Flow Rate Decided?
Your flow rate is a medical decision. Doctors usually base it on symptoms, blood oxygen readings such as SpO2 from a pulse oximeter, and sometimes lung function tests or blood gas results. The target is to keep your oxygen level within a safe range, not to maximise the amount of oxygen. Too little may not help, and too much is not automatically better, particularly for people with certain chronic lung conditions. Never change the flow setting on your own.
What to Check Before You Buy
Match the machine to the prescription
Ask your doctor for the exact LPM and whether oxygen is needed all day, only at night or only during activity. Then choose a concentrator rated above that figure.
Look at oxygen purity at your flow
Check the manufacturer’s stated oxygen concentration at the flow you will actually use, not only at the lowest setting.
Plan for power cuts
Concentrators need continuous electricity. If your area has frequent outages, keep a backup plan, such as a UPS rated for the machine or a spare cylinder, and discuss it with your doctor. Our guide on oxygen concentrator vs oxygen cylinder explains when each option makes sense.
Consider noise, size and servicing
A machine that runs all night should be reasonably quiet. Also confirm that warranty, filters and service support are available locally.
Where to Compare Options
You can see the range of available models on our oxygen concentrator price in Pakistan page, and read more about suitable devices in best home oxygen machines for patients. If you also use a CPAP or BiPAP for sleep apnea, ask your doctor whether oxygen can be combined with it, and see our CPAP machine price in Pakistan page for those devices.
This article is for general information only and is not medical advice. Please consult a doctor before starting oxygen therapy or changing your flow rate.
Frequently Asked Questions
Is a 10L oxygen concentrator better than a 5L?
Not necessarily. A 10L machine can deliver a higher maximum flow, but it is larger, noisier and uses more power. If your prescription is within 5 LPM, a 5L machine is usually enough.
Can I run a 5L concentrator at 5 litres all day?
Many are designed for continuous use, but you should follow the manufacturer’s guidance and your doctor’s prescription, and keep the filters clean.
Does the litre number tell me how long the oxygen will last?
No. A concentrator does not store oxygen. It produces it from room air, so it keeps working as long as it has power and is maintained.
How do I know if I need home oxygen at all?
Only a doctor can decide, usually after checking symptoms and oxygen saturation. Do not start oxygen at home without medical advice.
What should I check when comparing the oxygen machine price?
Compare the flow rating, oxygen purity at your flow, noise level, warranty and local service availability, not only the price.
Choosing the right concentrator is mostly about matching the machine to a doctor’s prescription with a little room to spare. Start with the flow you are prescribed, then compare size, noise and power needs.
Reviewed for accuracy by Noman Javed and Mohammad Umer, sleep therapists at CPAP.pk with 10 and 12 years of experience in sleep testing and CPAP therapy.
Last updated: November 3, 2026.
This information is for general education and does not replace advice from your doctor.