Resvent iBreeze Heated Tubing and Rainout: Three Things to Change

Updated 29 September 2026

You wake up, lift the mask, and the hose gurgles. There is water in the tube, and some of it has reached your face. If you use a Resvent iBreeze heated tubing set-up and sleep with the air-con on, this is worth sorting out properly.

I am Jo Ng, a Registered Polysomnographic Technologist (RPSGT). That makes me a sleep technologist, not a doctor. I help people with equipment and set-up. I do not diagnose, and I do not adjust prescriptions. This guide stays inside that line.

One note before we start. For this article the Resvent iBreeze user manual and the current product pages were reviewed. Where something could not be confirmed in those documents, I say so, and I have left it out rather than guess.

What rainout is, and the three things you can change

Rainout is the everyday name for water collecting inside the hose. Humidified air leaves the machine, travels down the tube, and some of that moisture turns back into water droplets. The droplets run down the tube. You hear a gurgle, or you feel the water at the mask.

Manufacturers publish troubleshooting tables for this. The clearest one I could read in full is the Philips DreamStation Heated Humidifier user manual. It is a different brand from Resvent, so I use it only as a manufacturer's checklist, not as a description of your iBreeze. Under "Excessive condensation in the tubing", it lists these causes:

• "The humidity level setting is too high."
• "The humidifier is positioned incorrectly."
• "Heated Tubing setting is set to zero."

Its suggested actions include "Reduce the humidity level setting", "Verify that the humidifier and therapy device are away from air conditioning equipment", and "Make sure the Heated Tubing setting is not set to zero."

So there are three levers: how warm the tube is, how much humidity you ask for, and where the machine and hose sit. That's a better way to think about rainout than looking for a single cause.

The rest of this guide takes the levers one at a time. First, a habit that saves a lot of frustration.

Change one thing at a time

When the hose is wet, it is tempting to change everything at once. You turn the humidifier down, move the machine, close the air-con vent and buy a fleece cover, all in one evening. The next morning the hose is dry, and you have no idea which change worked. Two weeks later the problem comes back, and you have no idea what to undo.

Keep a simple log for about a week. Use a notebook or a note on your phone. Write down these things each morning:

1. The date.
2. Your humidifier level (Auto, or a number).
3. Which tube you used (heated or standard).
4. Where the machine was, and where the hose ran.
5. Whether the hose was wet, damp or dry when you woke.
6. Anything different about the room: the air-con timer, a window, a fan.

Change one item, then leave it for two or three nights before you judge it. A single dry morning proves very little. A pattern across several nights tells you something.

If you end up messaging us for help, this log is the most useful thing you can send. It lets me see what you have already tried.

First, check your Resvent iBreeze heated tubing is the one attached

The first check costs nothing. Are you actually using the heated tube?

Both the Resvent iBreeze Auto and the iBreeze Pro product pages state that the machine "comes with 1x heated tubing and 1x non-heated tubing". Resvent's manual describes both options too. It says that if you use a standard tube instead of a heated tube, you simply slide the tubing over the air outlet port on the device.

That means it is possible to have the wrong tube connected without noticing. If the standard tube is on the machine, your Resvent iBreeze heated tubing is sitting in the box doing nothing.

Check which one is attached. If you are not sure, message us with a photo of the connector end and we will tell you which tube it is.

If you searched for heated tubing cpap advice, start here. The fix may be as simple as swapping the tube.

What I could not confirm about tube temperature on the iBreeze

Some CPAP brands give the heated tube its own temperature setting. Philips' manual, for example, refers to a separate "Heated Tubing setting". I looked for the same thing in the Resvent iBreeze CPAP System User Manual (document H-4000-000002-00, version 5.0, issued July 2020). That manual describes the humidity setting as "Auto / OFF / 1-8" with a default of 3. I could not find a separate tube-temperature menu described in it.

That manual covers the iBreeze CPAP models it lists, and your unit may differ. So I will not tell you that your iBreeze has a tube-temperature menu, and I will not tell you it does not. Look through your own device menu. If you see a heated-tube option, note its current value in your log before you change it. If you don't, message us with your model name and we will check it for you.

Then look at the humidifier level

The humidifier is the second lever. Resvent's manual says the humidity setting is there to "enhance patient comfort of respiration". The options are Auto, OFF, or 1 to 8, with a default of 3. Our product pages give the same range: "auto feature and manual settings from 1-8".

Lowering the level is a legitimate step. Philips' manual lists "Reduce the humidity level setting" as an action for excessive condensation. I do not agree with advice that says lowering it never helps. It can.

There is a trade-off, and it is about comfort. You chose a heated humidifier because you wanted moist air. Turn it down and you may feel that you have less. Everyone is different, so I will not predict how you will feel. Here is a sensible way to do it:

• If you are on a manual number, move down one step, not three.
• Leave it for two or three nights and note what you see in the hose.
• Also note how your nose, mouth and throat feel in the morning. Write it in the same log.
• If the hose is dry but you are uncomfortable, that is useful information. Tell us. Do not just live with it.

If you have been reading about dry mouth or mouth leak alongside this problem, they can interact with each other. Our guide on CPAP dry mouth, mouth leak and bloating walks through the order to tackle them.

One more practical point. Use the water the manual asks for. Resvent's manual says: "Use only room temperature distilled water or purified water." It also gives a maximum fill level of 290 mL. Keeping to those two rules avoids a separate set of problems.

Then look at where the machine and hose sit

This lever is free, and it has clear wording in the manual. Section 7.1 of Resvent's manual says to place the device "at a level lower than your sleeping position". It also says: "Make sure the device is away from any heating or cooling equipment (e.g., forced air vents, radiators, air conditioners)."

The safety section repeats the first point in a stricter form: the humidifier "must always be positioned below the breathing circuit connection at the mask", and it "must be level for proper operation".

Put together, that gives you a simple set-up check:

• Height. The machine sits lower than your head when you lie down. A low bedside table or stool works if your bedside table is too high.
• Level. The machine stands flat on a firm surface. Nothing soft underneath it.
• Away from the air-con. The machine is not in the path of the cold air from the air-con vent.
• Hose path. The hose is not stretched or pulled tight. The manual says: "Do not pull or stretch the tubing."

On hose routing, two manuals give a similar tip. Resvent's manual suggests that, with a headboard, you try "placing the tubing over the headboard", and gives tension on the mask as the reason. Philips' manual says to "Route the tubing behind the bed's headboard" as hose management, to stop the humidifier being pulled off a table. Neither manual says this fixes rainout, so treat it as tidy hose management. It keeps the tube from being dragged, and that is worth doing anyway.

What not to do to the tube

People often try to insulate the hose with a fleece wrap or a sock. It is an understandable idea.

Resvent's manual has a specific line on this: "Do not cover or heat the breathing tube with anything influent the patient end temperature." The wording is awkward, but the meaning is clear enough. Do not wrap or add heat to the tube in ways that change the temperature of the air at your end.

So I will not recommend a homemade cover for the iBreeze. If you are thinking of trying one, ask us first. We can tell you whether it is safe for your set-up.

What the machine does after you stop therapy

Some people are puzzled that the machine keeps blowing air after they take the mask off. Resvent's troubleshooting table has an entry for this. The listed cause is "Device is cooling down." The explanation reads: "Device blows a small amount of air to avoid condensation in the air tubing. It will stop automatically after a few minutes."

The practical advice is short. Let it finish. Don't fight it, and don't unplug it early to get the quiet back. It's doing what the manual says it should.

Do you need the Pro to get heated tubing?

No. Both machines include the heated tube. Our product pages list the iBreeze Auto at S$1,400 and the iBreeze Pro at S$1,500, and both pages say the machine comes with one heated tube and one non-heated tube. The S$100 difference does not buy you heated tubing, because you already have it either way.

What the Pro adds, according to its product page, is different:

• Auto CPAP Women's mode, which "offers a gentler pressure algorithm".
• CPAP-V, which "offers a 7, 14, or 28 night titration before the CPAP Machine automatically assigns a straight CPAP therapy".

Neither of those is described as a rainout feature on the product pages. So if wet tubing is your only reason for looking at the Pro, I would work through the levers above first. The full Auto versus Pro comparison sets out the differences so you can decide for yourself.

Is it really rainout? Check where the water is

Not every wet-face morning is rainout. Water inside the hose is a hose problem. A damp cheek with a dry hose is a different thing to look at. It may be a mask that is not sealing well, and that belongs in a mask-fitting conversation.

Look at where the water is before you change any settings. The check takes a minute:

1. In the morning, lift the hose and look along its length. Is there water inside?
2. Look at the mask connector and the inside of the cushion.
3. Note whether the skin under the mask is damp, and whether you heard air escaping at night.

If the hose is dry and the mask area is wet or noisy, read our guide on how to find a CPAP mask that seals. Changing tube settings will not fix a seal problem.

Also keep pressure out of this. Your pressure settings come from your prescriber. Don't change them to chase a comfort problem. If you think the pressure feels wrong, tell your doctor or tell us, and we will pass it on.

Keeping the rest of the set-up in good order

Rainout is easier to spot when everything else is clean and working. Resvent's manual has a maintenance schedule. It says to clean the tube monthly, and to replace the tube as necessary. It also tells you to inspect the tubing for damage or wear, and to discard and replace it as necessary.

In our climate, cleaning and drying matter for other reasons too. We cover that in our guide to CPAP maintenance in humid weather.

The Resvent manual lists on-screen alerts, including one that tells you the tube has expired and should be replaced. Follow what the screen says. If a message appears about the humidifier or the tube, contact us with the exact wording, and do not try to clear it repeatedly.

A simple plan for the next seven nights

If you want something concrete to follow, here is a plan. It uses only the steps from this guide.

1. Night 1. Check that the heated tube is the one attached. Check the machine is lower than your pillow, level, and out of the air-con's path. Change nothing else. Note the result.
2. Nights 2 and 3. If the hose is still wet, look at your device menu for a heated-tube option. If there is one, tell us what it shows before you change it.
3. Nights 4 and 5. If the hose is still wet, lower the humidifier by one step. Note the hose and how your nose and throat feel.
4. Nights 6 and 7. Review your log. If the hose is dry and you are comfortable, keep the settings. If the hose is dry but you are not comfortable, or the hose is still wet, message us with the log.

Seven nights is not a rule. It is a way to stop guessing.

What it costs, and how to reach us

If you already own an iBreeze, none of the steps above costs money. If you are still choosing, our product pages list the iBreeze Auto at S$1,400 and the iBreeze Pro at S$1,500. Both are listed as HSA approved (DE0507383), and shipping is free with purchases above S$200. Our pages describe YesCPAP as the authorised distributor for Resvent in Singapore.

Our product pages also list therapy commencement consultation, early-days coaching, pressure optimisation and mask-fit coaching with a new machine, delivered remotely over WhatsApp. In-person visits carry a fee.

Message us on WhatsApp at +65 9858 4461. Send your machine model, a photo of where it sits, your humidifier setting and your log. That gives me the best chance of working out where to look.

Frequently asked questions

What is rainout in a CPAP hose?

Rainout is water that collects inside the hose. Humidified air leaves the machine, and some of the moisture turns back into water droplets in the tube. Philips' DreamStation humidifier manual lists a high humidity level, a wrongly placed humidifier and a heated tubing setting of zero as causes of excessive condensation in the tubing.

Should I turn the humidifier down if the hose is wet?

It's a reasonable step. Philips' manual lists "Reduce the humidity level setting" as an action for condensation. Move down one step, wait two or three nights, and check how your nose and throat feel too. If the hose is dry but you feel uncomfortable, tell us rather than living with it.

Where should I put my iBreeze at night?

Resvent's manual says to place it on a firm, flat surface, within easy reach, at a level lower than your sleeping position. It also says to keep it away from heating or cooling equipment such as forced air vents and air conditioners. The humidifier must sit level and below the mask connection.

Can I wrap the hose in a fleece cover?

Resvent's manual says not to cover or heat the breathing tube with anything that influences the temperature at the patient end. Because of that, I do not recommend a homemade wrap for the iBreeze. If you are thinking of trying one, message us first and we will advise on your specific set-up.

Why does the machine blow air after I stop therapy?

Resvent's troubleshooting table says the device is cooling down. It blows a small amount of air to avoid condensation in the air tubing, and stops automatically after a few minutes. Let it finish before you unplug it.

Do CPAP masks work with any machine?

Our product pages say masks are universal, with one exception: masks made specifically for the ResMed AirMini do not transfer. If you are unsure whether your current mask suits the iBreeze, send us the mask name and a photo, and we will check it for you.

If your Resvent iBreeze heated tubing is still collecting water after this guide, message us on WhatsApp with your log. It's easier to help when I can see what you have already tried.

This article is for general awareness only and is not medical advice, diagnosis, or treatment. Obstructive sleep apnoea is diagnosed from a sleep study interpreted by a physician, and CPAP therapy requires a doctor's prescription. Jo Ng is a Registered Polysomnographic Technologist, not a physician. Always consult a qualified healthcare professional about your own situation.