Genuine vs Compatible CPAP Parts: Save Money Without Risking Your Therapy
Genuine vs Compatible CPAP Parts: Save Money Without Risking Your Therapy
CPAP parts wear out on a schedule, and the cost of keeping up adds up. Compatible parts can cut it considerably — if you know which parts are easy wins, which need more care, and what to check before you buy.
Jump to what matters to you.
What "genuine" and "compatible" actually mean.
Genuine parts — sometimes called original or OEM parts — are made by the company that made your mask or machine. For most people in the UK that's ResMed. Compatible parts are made by a different manufacturer, designed to fit the same mask or machine and do the same job.
Compatible parts aren't counterfeits. A reputable compatible part is sold under its own manufacturer's name and uses the original brand's name only to tell you what it fits — "compatible with AirFit F20", not "AirFit F20". That distinction matters, and it's one of the quickest ways to judge a seller, which we'll come back to.
Compatible parts usually cost less because the manufacturer isn't carrying the original brand's research, development and marketing costs, and because the parts that wear out fastest — cushions above all — are relatively simple components to make well.
Why this matters more than it seems
The most expensive mistake in CPAP isn't buying the wrong brand of cushion. It's using a worn cushion for months because replacements feel expensive. A tired cushion leaks, a leaking mask gets over-tightened, an over-tightened mask leaves marks and gets taken off at 3am — and therapy quietly stops working. If compatible parts mean you replace on schedule instead of stretching things out, that's a genuine win for your health as well as your wallet.
Where compatible parts are an easy win — and where to take more care.
This isn't a ranking of quality. It's about what a mismatch would cost you: a slightly loose strap cover is an annoyance; a vent or heated tube that isn't right is a bigger deal.
On a phone, swipe sideways to see the whole chart.
Easy wins are parts where fit is simple to judge and a poor match is obvious and harmless — you'd notice a strap cover that didn't fit, and nothing about your therapy would change. Cushions and headgear sit in the middle: they're the parts you replace most, so compatible versions save the most money, and fit is easy to check on the first night. Frames, elbows and vent rings need more care because the elbow or vent carries the exhalation vent — the route your exhaled carbon dioxide takes out of the mask. Heated tubes are electrical and made for one specific machine, so they're the part to match most carefully of all.
What's on your mind?
| If you're thinking… | Read |
|---|---|
| "Replacements are so expensive I keep putting them off" | Problem 1 |
| "How do I know a compatible part will fit my mask?" | Problem 2 |
| "My new cushion leaks — was compatible a mistake?" | Problem 3 |
| "Are compatible parts actually safe?" | Problem 4 |
| "Will it affect my warranty?" | Problem 5 |
| "Heated tubes cost a lot — is a compatible one OK?" | Problem 6 |
Replacement costs add up, so you stretch parts too long.
The cushion's three months old and going soft, but a new one feels like money you'd rather not spend this month. So it stays on for another month. And another.
Precautions first — make every part last its full life
Wash your cushion daily in warm water with a mild, unscented soap, rubbing the sealing edge gently to lift facial oils. Properly washed cushions last noticeably longer.
Wash your face before bed and move moisturiser to the morning. Night creams are the single biggest cause of early cushion failure.
Don't over-tighten. Excess tension wears cushions out faster and stretches headgear.
Keep spares sealed, dry and out of sunlight until you need them.
Our replacement schedule and cleaning guide cover both in detail.
What helps
Two things bring the cost of replacing on schedule right down: compatible cushions, and buying them in multipacks. A pack of three or five covers several replacement cycles at a lower cost per cushion, and means there's always a fresh one in the drawer — so there's no reason to keep using a worn one.
Only buy a multipack once you're sure of your size. All the cushions in a pack are the size you choose. If you're new to a mask, buy one first and confirm the fit.
You're worried a compatible part won't fit.
The listing says "compatible with AirFit F20" — but is that your F20? What about the For Her version, or the AirTouch? Will it click into your frame?
What you're worried about
Ordering a part, waiting for it to arrive, and finding it doesn't fit is frustrating at the best of times. With CPAP it can also mean a night on a worn cushion while you sort it out. That worry stops a lot of people trying compatible parts at all.
Why fit problems happen
Almost always because the part was ordered for the wrong mask, the wrong size, or the wrong version — not because compatible parts don't fit. Mask families look similar but aren't interchangeable: an F20 cushion won't fit an F40 frame, and nasal mask parts won't fit full face masks.
Precautions first
Check the exact model printed on your mask frame — AirFit F20, AirTouch F20, AirFit F40 and so on. Don't rely on memory.
Check the size printed on your current cushion, and order the same.
Read the compatibility statement on the listing. A good one names exactly which masks the part fits, and which it doesn't.
Know the family quirks. AirFit F20 and AirTouch F20 share a frame, so their cushions are widely sold as interchangeable. The F40 is a different platform altogether.
Ask before ordering if you're unsure. A good seller would rather answer a question than process a return.
Not sure which mask you have, or whether it's the right one for you? Our guides to full face masks and nasal masks help you identify and compare them.
Your new part leaks or feels different.
You've fitted a fresh cushion — compatible or genuine — and the first night is worse, not better. Air hissing, a different feel on your face, a seal you can't quite get.
What you're suffering
It's disheartening to replace a part and find things get worse. The natural conclusion is that the new part is faulty, or that compatible parts don't work. Usually neither is true.
Why it happens
A fresh cushion seals with far less tension than the worn one you removed. Your straps are still set for the old, soft cushion, so the new one is over-compressed — and over-compressed cushions crease and leak. A cushion not fully seated in the frame leaks at the edge. And any new cushion feels different on the skin for a night or two, whoever made it.
Precautions first
Wash the new cushion before first use and let it dry fully.
Seat it properly. Press around the whole edge until it clicks home with no gaps.
Reset your tension. Loosen every strap, put the mask on lying down with the machine running, and tighten evenly only until the leak stops.
Give it two or three nights before deciding. If it's painful, stop sooner.
Check your headgear. Stretched straps can't hold even a perfect new cushion — and if you replaced the cushion but not the straps, that may be the real culprit.
If it still doesn't work
Occasionally a particular cushion simply doesn't suit a particular face. If you've reset everything and given it a fair trial, try the genuine cushion for your mask. Some people do find one seals better for them than the other, and the right answer is whichever works on your face.
You're not sure compatible parts are safe.
It's a medical device. You've seen cheap parts sold online with no name on the packet. How do you know what you're getting?
A fair worry
Compatible parts vary. Some are made by established manufacturers to a clear standard; some are anonymous. The answer isn't to avoid compatible parts altogether — it's to know what a reputable one looks like, and to buy from a seller who's clear about exactly what you're getting.
What to look for
Our own compatible range, including ResLab parts, is listed with the manufacturer, what each part fits, and a clear statement that it isn't made by ResMed. If anything on a listing isn't clear to you, ask us before you buy.
You're worried about your warranty.
Your mask or machine is fairly new. Will fitting a compatible part cause problems if something goes wrong?
The honest answer
Fitting a non-original part may affect any remaining manufacturer warranty on your mask system. Warranty terms are set by the manufacturer and vary, so we can't promise either way — and nor should anyone else.
Precautions first
Check your warranty terms, especially if your mask or machine is less than a year or two old.
Keep the original parts you've replaced, at least while the warranty lasts, in case you need to show the system in its original form.
Think about which part. Strap covers and hose covers don't connect to anything that matters for a warranty. Heated tubes connect to your machine's electrics — so if your machine is under warranty, that's the part to think hardest about.
NHS-supplied equipment usually belongs to your sleep service. Ask them before fitting third-party parts to it.
A sensible approach
Many people use genuine parts while a mask or machine is new and under warranty, then move to compatible parts for routine replacements once it's out of warranty. That captures most of the savings with very little risk.
Heated tubes are expensive — is a compatible one worth it?
Rainout every winter has convinced you that you need a heated tube. Then you saw the price.
Why heated tubes are different
A heated tube isn't just a hose. It has a heating wire along its length and an electrical connection into your machine, and it's made for one specific machine. That's why it's the part to match most carefully, whoever makes it.
Precautions first
Match the machine exactly. AirSense 10 and AirSense 11 heated tubes are not interchangeable — ResMed states that the ClimateLineAir 11 is the only heated tubing compatible with the AirSense 11.
Check your machine's warranty before fitting a compatible heated tube to a machine that's still covered.
Inspect it regularly for damage to the tube or the connector, and stop using any heated tube that's cracked, kinked or damaged at the cuff.
Try the free fixes first. Putting the machine below mattress height and turning humidity down a step often reduces rainout without buying anything — our winter guide explains.
What helps
For AirSense 10 and AirCurve 10 owners whose machine is out of warranty, a compatible heated tube is a reasonable way to solve rainout for less. For AirSense 11 owners, the genuine ClimateLineAir 11 is the option to choose.
A sensible mix of genuine and compatible.
You don't have to choose one or the other. Most people get the best result by mixing them, part by part.
| Part | Our suggestion | Why |
|---|---|---|
| Mask (complete) | Genuine | A one-off purchase that sets your fit and starts your warranty |
| Cushions | Compatible multipacks, once your size is confirmed | Replaced most often — the biggest saving, and fit is easy to judge |
| Headgear | Either | Easy to check, replaced about twice a year |
| Strap and hose covers | Compatible | Comfort accessories, low risk |
| Standard tubing | Compatible | Replaced every 3 months; simple to check |
| Frames, elbows, vent rings | Either — from a seller who's clear about compatibility | Carry the vent; match carefully and never modify |
| Heated tube | Genuine while the machine is under warranty; either after | Electrical and machine-specific |
On a phone, swipe the table sideways to see every column.
One more habit worth adopting: keep one genuine spare cushion in the drawer, even if you mainly use compatible ones. It's a useful comparison if a new cushion ever seems not quite right, and a reliable fallback for the odd night something goes wrong.
Your year of parts, at a glance.
Knowing how many of each part you'll get through in a year is what makes a sensible budget — and shows where multipacks earn their keep.
| Part | Typical interval | Roughly per year |
|---|---|---|
| Silicone cushion | Every 1–3 months | 4 to 12 |
| Memory foam cushion | About monthly | Around 12 |
| Headgear | Around every 6 months | About 2 |
| Frame | Every 6–12 months | 1 to 2 |
| Standard tubing | Every 3 months | About 4 |
| Heated tubing | Every 6–12 months | 1 to 2 |
| Disposable filters | Every 2 weeks to a month | 12 to 26 |
Typical figures for one user. Always follow your own equipment's instructions.
The cushion line is the one that matters most for your budget. It's the part you replace most often, the range is wide — four a year for someone with good habits and a forgiving face, twelve for someone whose skin is oily or who sleeps heavily on one side — and it's where compatible parts and multipacks make the biggest difference.
Two practical points. First, the lower end of each range is earned, not luck: daily washing, morning moisturiser and correct strap tension genuinely stretch intervals. Second, replace headgear with every second or third cushion rather than waiting for it to fail. A cushion-and-headgear set at the six-month mark resets the whole seal in one go.
Switching to compatible parts, step by step.
Try a single compatible cushion first. It's the part you'll buy most often, so it's where you'll learn most quickly whether a compatible version suits your face — and it's easy to compare with the one you're replacing.
Wash it, seat it fully in the frame, loosen every strap and refit lying down with the machine running. Tighten only until the leak stops. Most "this doesn't work" first nights are tension problems.
Compare your leak figure and usage with the previous few weeks. Similar or better means it's working. Our guide to reading your CPAP data shows what to look for.
Once you're happy with the fit and the size, a pack of two, three or five brings the cost per cushion down and keeps a spare in the drawer.
A single genuine cushion in reserve is a useful reference if a new cushion ever seems wrong, and a dependable fallback for a bad night.
VAT relief: check whether you're eligible.
In the UK, people who are disabled or have a long-term illness may be able to buy eligible products for their own personal use without paying VAT. According to GOV.UK, that includes people with a condition that's treated as chronic sickness, and you claim it by signing an eligibility declaration confirming you meet the conditions. Your supplier can tell you which products qualify.
Whether you qualify is your own declaration to make, and it's worth reading the guidance properly before you sign — people who are elderly but not disabled, or only temporarily disabled, don't qualify. The official guidance is at GOV.UK: VAT relief for disabled people. If you're unsure, ask us before ordering.
Your buying checklist.
Five things people believe about compatible parts.
Quick answers on genuine and compatible parts.
What is the difference between genuine and compatible CPAP parts?
Genuine parts are made by the company that made your mask or machine, such as ResMed. Compatible parts are made by a different manufacturer, designed to fit the same mask or machine and do the same job, usually at a lower cost. A reputable compatible part names its own manufacturer and uses the original brand only to say what it fits.
Are compatible CPAP parts safe?
Reputable ones are, but quality varies. Look for a named manufacturer, a clear compatibility list, stated materials, magnets disclosed where present, and a UK seller you can contact. Medical devices sold in Great Britain should carry a UKCA or CE mark. Never modify any part, especially the vent.
Will compatible parts void my ResMed warranty?
Fitting a non-original part may affect any remaining manufacturer warranty on your mask system, and terms vary, so check your warranty. Many people use genuine parts while equipment is under warranty and switch to compatible parts for routine replacements afterwards.
Why does my new cushion leak?
Usually because your straps are still set for the old, softer cushion. A fresh cushion needs far less tension. Seat it fully in the frame, loosen every strap, refit lying down with the machine running, and tighten only until the leak stops. Check your headgear isn't stretched too.
Can I use a compatible heated tube on my AirSense?
Compatible heated tubes are available for some machines, such as the AirSense 10 and AirCurve 10. They must match your exact machine, and if your machine is still under warranty you should check the terms first. For the AirSense 11, ResMed states that the ClimateLineAir 11 is the only compatible heated tube.
How can I save money on CPAP supplies in the UK?
Make parts last their full life with daily cleaning and correct strap tension, buy cushions in multipacks once your size is confirmed, consider compatible parts for routine replacements, and check whether you're eligible for VAT relief on eligible products.
Do I qualify for VAT relief on CPAP supplies?
VAT relief is available to people who are disabled or have a long-term illness, on eligible products for their own use, claimed by signing an eligibility declaration. Whether you qualify is your own declaration to make — read the GOV.UK guidance first, and ask your supplier which products qualify.
More UK-specific CPAP guidance.
This guide is general information, not medical, legal or tax advice. Follow the user guide supplied with your mask and machine, check compatibility with your specific model before use, and never modify any part — especially the vent. Never adjust your prescribed pressure settings yourself.
Fitting non-original parts may affect any remaining manufacturer warranty; check your terms. Equipment supplied by the NHS usually belongs to your sleep service — ask them before fitting third-party parts. Parts with magnetic clips may interfere with implanted medical devices; read the safety information and speak to your clinician if this applies to you or anyone sharing your bed. VAT relief eligibility is a matter for your own declaration; see GOV.UK.
AirFit™, AirTouch™, AirSense™, AirCurve™, ClimateLineAir™, InfinitySeal™ and ResMed™ are trademarks of ResMed Ltd. ResLab and other compatible parts are not manufactured, endorsed by, or affiliated with ResMed Ltd; ResMed names are used only to identify compatibility.
