Resmed 11 humidity pot runs out of water

I have got a new Resmed 11 few months back. This replaced an old Airsense 10. I have found the 11 humidity pot is dry by morning, even for short sleep cycles, like 5 or 6hrs. I could sleep 10hr with the old 10 and still have water left for another night's sleep.

The DME did not send the heated hose for the 11. Is this the reason water gets used more? I feel too dry on setting of 4 so typical have it on 5 or 6.

Or is the water pot too small for the 11?

Bill

The humidifier of the 11 is the same size as the 10, both 380ml. But the taller design of the the 10, allows it to be over-filled a little bit more.

A heated hose doesn't make it use more water. But having a heated hose and setting the humidity and hose temp to auto could have resulted in less water use.

BikeisDusty wrote: ↑

Wed Jan 25, 2023 9:50 am

I feel too dry on setting of 4 so typical have it on 5 or 6.

On your Air10 you had the humidity set to 4 (or auto), on your 11 it's on 5 or 6. That's why it's using more water.

From my experience, bedroom humidity is a big factor in how much water you use on the machine. If I use a room humidifier in my bedroom, my machine water usage drops considerably.

jas32 wrote: ↑

Wed Jan 25, 2023 3:54 pm

From my experience, bedroom humidity is a big factor in how much water you use on the machine. If I use a room humidifier in my bedroom, my machine water usage drops considerably.

My brand new Resmed 11 , when it started getting cold outside, was having the water chamber empty in the morning. I bought a cheap humidifer for my bedroom when I found out the humidity was around 20%. I turn the humidifier on at night, I wake up with the humidity in the room at around 45%, and there is water left in the Resmed 11.

While adding ambient humidity to a room appears to avoid running a CPAP tank dry, it would seem that the manufacturer should be designing the tank size to not run dry even with the lack of supplemental humidity added to a room.

Grumpy48 wrote: ↑

Thu Jan 26, 2023 12:09 pm

While adding ambient humidity to a room appears to avoid running a CPAP tank dry, it would seem that the manufacturer should be designing the tank size to not run dry even with the lack of supplemental humidity added to a room.

So what, they should put a gallon size tank on the machine (which would require a LOT more power to heat up) just because a minority of people need more than the standard 380ml of water?

*MOST* people don't use up the whole water tank every night.

Maybe they should put a hose that runs to the bathroom faucet so there's a never ending supply of water?

Grumpy48 wrote: ↑

Thu Jan 26, 2023 12:09 pm

While adding ambient humidity to a room appears to avoid running a CPAP tank dry, it would seem that the manufacturer should be designing the tank size to not run dry even with the lack of supplemental humidity added to a room.

Then they would come here carping that the machine doesn't fit on their nightstand or in their travel bag.

BikeisDusty wrote: ↑

Wed Jan 25, 2023 9:50 am

I have got a new Resmed 11 few months back. This replaced an old Airsense 10. I have found the 11 humidity pot is dry by morning, even for short sleep cycles, like 5 or 6hrs. I could sleep 10hr with the old 10 and still have water left for another night's sleep.

The DME did not send the heated hose for the 11. Is this the reason water gets used more? I feel too dry on setting of 4 so typical have it on 5 or 6.

Or is the water pot too small for the 11?

Bill

Have you increased the pressure? What is your leak level? The more leak = the more water consumed.

ChicagoGranny wrote: ↑

Thu Jan 26, 2023 1:48 pm

Grumpy48 wrote: ↑

Thu Jan 26, 2023 12:09 pm

While adding ambient humidity to a room appears to avoid running a CPAP tank dry, it would seem that the manufacturer should be designing the tank size to not run dry even with the lack of supplemental humidity added to a room.

Then they would come here carping that the machine doesn't fit on their nightstand or in their travel bag.

Just get the 5 gallon jug delivery size, set that next to the bed.

Number one factor in the amount of water that gets consumed...ambient humidity.
Other factors are humidity setting, pressures used and leak rate.

I use the max humidity setting of 8...AirCurve 10 machine...ambient humidity around 40%...leak pretty much zero..pressures average around 10/12 ish....just filled up the water chamber and I still had water to the bottom line level. Plenty left. Not enough for 2 nights but surely enough for 1 night. That was with 8 hours of use as well.

If a water chamber is totally dry after 6 to 8 hours of use....something somewhere is causing it to happen.

When people complain of running out of water in the winter time...I always say check the ambient humidity first because if we are using a furnace or a wood stove it is going to dry the air out.

But changing bottles is a BEAST!

I've just recently purchased an AirSense 11 to replace my aging Philips. The Philips was still fine, near as I could tell, but it was whole lot noisier than my wife's AirSense and seemed to maybe be getting noisier still. Better to replace it early, I thought.

I too notice a HUGE difference in water use. The tank of the Philips is actually a bit smaller than the Resmed, but EASILY lasts two nights. The Resmed is empty after no more than 5 hours. I'm confident of this time because the Resmed shuts off after 5 hours, leaving me gasping for air at 4:00 AM.

(This is with the auto-shutoff "feature" disabled.)

I'll restart the machine and an hour later it shuts off again. And again. And again. Only with water in the tank will it run.

Here's the thing. It's not a room humidity issue. It's pounding with rain these days .. RH is about 99. The only way it could be higher was if I was underwater. The pressure auto picked by Resmed is very close to the manual setting of the Philips, 11.1 vs 10.5. It's the same mask .. whatever leakage there is should be the same.

I think there's a problem with my machine, and perhaps others, plain and simple. What the problem is, I don't know, but my creaky old cancer causing Philips is back beside my bed. My fancy new Resmed is in the closet and headed for recycling as I search for a GOOD machine.

alanbc wrote: ↑

Sun Mar 03, 2024 10:54 am

My fancy new Resmed is in the closet and headed for recycling as I search for a GOOD machine.

1. You don't mention the humidity setting of each machine.

2. You don't mention the mask leakage data with each machine.

3. You don't mention whether the new machine is under warranty.

4. Good luck with this st*&$%^y:

alanbc wrote: ↑

Sun Mar 03, 2024 10:54 am

My fancy new Resmed is in the closet and headed for recycling as I search for a GOOD machine.

I have ResMed Airsense 11 that I received a year ago in March 2023 to replace a Phillips DreamStation One that I had for 5 years. The DreamStation never ran out of water in that 5 years but the ResMed 11 lasted only 6 hours a night from the first day I used it. I run the ResMed 11 on automatic for both humidity and temperature.

I took a straw poll in a ResMed group on Facebook and received over 100 responses (118 if I recall right) and 17 percent responded that their ResMed 11 runs out of water.

I use a full face mask because I do open and close my mouth throughout the night and run high pressures. I have been using a Fisher-Paykel Simplus for the 6 years I've been on CPAP with both the Phillips DreamStation One and the ResMed Airsense 11. A few weeks ago I switched to a similar Fisher-Paykel Vitera which made no difference. My stats show no leaks.

One problem is the the ResMed 11 tank does not hold anywhere near its advertised 380 ml.

Measuring with a graduated cylinder from a lab supply, it's at most 325 ml depending on how much you want to challenge breaking the surface tension at the spillover point. I reported this to RedMed 3 times, most recently a few days ago. The customer service rep was clearly annoyed saying I had reported this twice before and that she can only submit reports when I asked her if they plan to fix the tank capacity. In other words she wasn't going to make the effort to find out the status for me.

People have suggested turning down the humidity manually or boosting humidity in the house to compensate for the deficiency of the machine. I reject these solutions out of hand. The machine should have enough capacity to humidify without assistance for a higher majority of people. I live near the ocean and it's a very wet environment here. I am not going to let the humidity in the house go over 50 percent bringing mold problems in the walls and humidity damage.

A doctor at my sleep clinic said the main usage of water is by the volume of air over time through the tank. I was pleased she said this because it was my thought exactly. She was able to extend the time of the tank by changing my max pressure from 20 to 17 which increased the time the tank lasts from 6 hours to 7.25 hours but had the effect of increasing CA events.

Before this pressure change, I had modified my tank with a hack to add an extension using gravity feed. This allows plenty of time althoughI haven't slept past 9.5 hours with it so I don't know the max time it will last. However, I don't want this kludge as a permanent solution because it's fragile and a pain to clean and transport. And I don't want to repeatedly pull the hoses off the barb connectors for cleaning/transport and thus risk a tank leak. But unless I find another solution I might go back to using the tank extension.

I want ResMed to offer an optional larger tank but I'm not holding my breath (no pun intended).