Heated or Standard CPAP Hose: Which One Fits Your Machine?
Quick answer: CPAP hoses come in three main types: standard (19 mm), SlimLine (15 mm) and heated. Standard and SlimLine tubing are non-heated and generally fit ResMed AirSense 10 and AirSense 11 machines alike. Heated tubing is model-specific: the AirSense 11 needs ClimateLineAir 11, and the AirSense 10 needs the original ClimateLineAir. Heated tubing is mainly worth it if you use humidification and get water building up in your hose or mask.
The three types of CPAP tubing
| Type | Inner diameter | Heated? | Best for |
|---|---|---|---|
| Standard tubing | 19 mm | No | Everyday use; durable and widely compatible |
| SlimLine tubing (ResMed) | 15 mm | No | Lighter, more flexible, less pull on smaller masks |
| Heated tubing (e.g. ResMed ClimateLineAir) | Varies by model | Yes | Humidifier users who get condensation in the hose |
All three connect to the mask in the same way, so your choice of tube doesn’t limit your choice of mask.
Standard vs SlimLine: what’s the difference?
Standard tubing has a 19 mm inner diameter. It’s the classic CPAP hose: sturdy, affordable, and compatible with most current machines.
SlimLine tubing has a narrower 15 mm inner diameter. It’s lighter and more flexible, so it drags less on the mask when you turn over in bed. That makes it popular with users of small nasal pillow and nasal masks, where a heavy hose can pull the seal loose.
Important: SlimLine tubing is designed for machines that support 15 mm tubing, such as the ResMed S9, AirSense 10 and AirSense 11. It isn’t recommended for machines built only for 19 mm or 22 mm tubing, where a narrower tube may affect the pressure reaching your mask.
Set your machine to match your tube. ResMed machines have a tube-type setting in the menu. If you switch between SlimLine and standard tubing, update this setting so the machine can compensate correctly. Your user manual shows where to find it.
Does my tubing fit the AirSense 10 and AirSense 11?
| Tube | AirSense 10 | AirSense 11 |
|---|---|---|
| ResMed SlimLine (15 mm) | ✅ | ✅ |
| ResMed standard (19 mm) | ✅ | ✅ |
| ClimateLineAir (heated, original) | ✅ | ❌ |
| ClimateLineAir 11 (heated) | ❌ | ✅ |
The rule: non-heated tubing carries over between the two machines; heated tubing doesn’t. If you’re upgrading machines, you can keep your SlimLine or standard tube, but you’ll need a new heated tube. See what else changes between the AirSense 10 and 11 →
Other brands, such as React Health and Resvent, use their own heated tubes too. Always match a heated tube to the exact machine name printed on your device.
What does heated tubing actually do?
When you use a humidifier, warm, moist air travels from the machine to your mask. If that air cools along the way, usually because the bedroom is cold, the moisture condenses into water droplets inside the tube. CPAP users call this “rainout.” You might hear gurgling in the hose or feel droplets at the mask.
Heated tubing has a thin heating wire built into the hose wall. It keeps the air at a steady temperature from the machine to the mask, so the moisture stays as vapour instead of collecting as water. On ResMed machines, heated tubing also works with the automatic climate settings, which manage tube temperature and humidity together.
Is heated tubing worth it?
Heated tubing is usually worth it if:
- You use your machine’s humidifier
- You hear gurgling or find water in your hose or mask
- Your bedroom is cool at night, or you run the air conditioning
- You’ve turned your humidity down to stop rainout but still find the air uncomfortably dry
A standard or SlimLine tube is usually enough if:
- You don’t use humidification
- You’ve never had water in your tube
- You want the lightest, simplest setup for travel
Quick fixes for water in a standard tube
If you aren’t ready to switch to heated tubing, these often help:
- Keep the machine lower than your head, so condensation drains back toward the machine instead of into the mask
- Use an insulating tube cover, a fabric sleeve that keeps the hose from cooling
- Run the tube under your blanket to keep it warm
- Raise the bedroom temperature slightly, or lower the humidity setting a step
- Empty and dry the tube each morning
How often should you replace CPAP tubing?
Standard, SlimLine and heated tubing are all typically replaced about every three months, or sooner if you see cracks, tears at the cuffs, or moisture you can’t dry out. See how often to replace your tubing and other parts →
Tubing is a replacement part and doesn’t require a prescription.
Frequently asked questions
Is heated CPAP tubing better than standard tubing?
Not automatically. Heated tubing helps if you use humidification and get condensation in your hose. If you don’t use a humidifier, a standard or SlimLine tube works just as well.
Can I use SlimLine tubing on an AirSense 11?
Yes. ResMed SlimLine tubing fits the AirSense 11, AirSense 10 and S9 machines. Set the machine’s tube-type setting to SlimLine.
Will my AirSense 10 heated tube work on an AirSense 11?
No. The AirSense 11 needs the ClimateLineAir 11 heated tube. The original ClimateLineAir fits the AirSense 10.
What size CPAP tubing do I need?
Most current machines take standard 19 mm tubing. ResMed machines also accept 15 mm SlimLine tubing. Heated tubing must match your specific machine model.
Why is there water in my CPAP hose?
Warm, humid air cools as it travels through the tube and condenses into water. This is called rainout. Heated tubing, a tube cover, or a slightly lower humidity setting usually solves it.
Do I need a prescription for CPAP tubing?
No. All types of CPAP tubing are replacement parts and can be bought without a prescription.
This article is general consumer information about CPAP equipment. It is not medical advice. Follow your device’s user manual and your healthcare provider’s guidance on your therapy.