Anyone Else Running Out of Water?

I have a F&P HC150 heated passover humidifier with a Respironics Solo LX CPAP set at 11 cm. I recently turned the humidifier temperature control up a scunch from about 2.5 to 3.5 & have noticed a dramatic improvement in dry mouth (I'm a mouth breather & use a FF mask) in the a.m. Ambient humidity in our bedroom is about 65%.

Since turning up the temperature though, the HC325 water chamber is completely empty after only 5-6 hours. I usually wake up sometime during the night & refill the water chamber, but I'm afraid if I sleep for more than 5 hours (there's always hope, right?) I may be running the system dry before I wake up, & I understand that's not a good idea.

I've checked with cpap.com & they advise there's not a larger chamber available for that humidifier, which would of course be the easy solution.

I have an extra water chamber - any of you technical types out there have any idea how I might be able to plumb 2 together in series so when 1 runs dry there would still be water in the 2nd unit? Or a way to "siphon" water from a back-up water supply to the one on the heater? I've seen some incredibly clever & creative ideas posted, from DIY oral air dams to toilet seat cover mask seals, so hopefully we have a MacGyver on board who can address this problem.

Thanks - any help or ideas will be most appreciated.

Gee that F&P HC150 heated passover humidifier does appear to hold a lot of water. I would check to make sure that your mask or hoses after the humidifier does not have a leak like small holes made from a cat for example. I normal do not see my water level drop much in one night in my humidifier unless I was mouth leaking form a nasal mask but you are using a full mask. You could use a gravity feed from a milk carton higher than the humidifier with a small air tubing that will keep the main water level constant in the humidifier but the air pressure might upset things to make this work.

I had the same problem with that model. However, that amount of water did help a lot with my dry mouth problem. And there was not a huge amount of rainout.

I'm using the Remstar APAP now with its humidifier and I don't loose a lot of water, but my mouth dryness is back. I don't think it reaches as high a temperature as the other one. Or maybe its not working properly will have to check it out.

I originally had Humidaire after finding out I absolutely could not get by wthout heated. I liked it very much except for the fact that I had to put it on the floor due to the small size of my bedside table. therefore my cpap was on the floor and due to the angles I had major hose problems. Was told by RT that the Humidaire was much better than the integrated Humidaire II. I now have Remstar Plus /c-flex and integrated heater. Nothing but problems from the humidifier. Dry mouth, sore throat, burning nose, and many days I sneeze and my nose runs all day long. At least once every night, I awaken with no heat. These are the same problems I had with passover humidifier before I got heated. I have tried for 3 weeks already, because I want so much for it to work, due to being able to put the whole unit on my nightstand. My DME says he will swap it out for another one or give me back my Humidaire, whichever I want. After hearing everyone elses problems with the Remstar, I've about decided to go back to the Humidaire. Also several nights, have run out of water, and boy does that ever hurt!