hmm, I didn't know the two tanks are the same size. I do go through water faster somehow then, I guess. And I've since decided to up the humidity and temp over the auto setting.

I didn't notice how old the thread was. I just Googled bigger AirSense tank and glad I found it.

Thanks so much to jdm5 and RonKMiller's important work in the world of sleep comfort. Just upgraded from an AirSense 10 to an AirSense 11. I'm lucky enough to make it through the night. But if you have trouble with the capacity of the 10, wait till you try an 11. I immediately started looking for an...