PureGuardian 12.5L Output per Day Ultrasonic Warm and Cool Mist Humidifier, Large Room, Home, Office, Easy Quiet Operation, Digital Display, Auto Humidistat, Timer, Auto Shut-Off, Pure Guardian H7550

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This product works well as advertised. But we learned the hard way that you cannot use Ultrasonic type humidifiers if you heat and/or cook with gas and use softened water. It the process of softening water heavy metals are exchanges for sodium ions. The ultrasonic humidifier shakes water to turn in into a mist. The sodium ions in softened water are also put in the air. Then your gas furnace or gas elements burn the sodium which is evidenced by the usual blue gas flame turns yellow - normally a sign of poor combustion. The manual fails to mention this situation.The only ways to use an ultrasonic type humidifier, in a house with open gas flames, is to used unsoftened water OR get water from a reverse osmosis filtering system. The first means more cleaning of the humidifier. The second means using expensive water.

UPDATE: It's now December 2018, and I've been using this same humidifier every winter since I purchased it. I am still very happy with its performance, and everything I originally listed below still holds true. I'm still a very happy customer with a happy cello!One additional Pro, is when the unit goes empty, it of course stops misting, the water level in the clear side strip is depleted, but the unit also has a small silent blinking symbol to let you know it's empty. Very thorough, and easy.👍*Original review*I read many reviews and did my research before deciding on a humidifier. In the end I chose this one and am very happy with it. My main reason for buying a humidifier was to maintain proper humidity for my cello, which is 40% - 50% and a bonus was for my benefit of not having dry air during the winter. I purchased this unit in Nov 2014.Pros;*Display controls are easy to use*Handle (indent in tank) makes it easy to lift tank, groove in unit to help with guiding tank into place*Extender rod with two pivoting directional holes at top, also comes with additional top to direct mist up instead of out and away -this may be a new addition because I read plenty of reviews about the inability to direct mist. I am very happy with the topper that has two pivoting holes. When I need to decrease the amount of humidity directed towards my cello but going down a level in mist output is too low, I pivot one hole slightly to the left and the other slightly to the right and that solves the problem.- I really like the height of the rod to bring the mist out at a higher level*Clear Slit on side makes it easy to see water level in tank*Warm mist or cool - I've read other reviews on this unit about disatisfaction of the warm mist feature. I agree that when you put your hand in the mist that it doesn't particularly feel warm. The manual says that the water at the base of the machine where the mist is produced should be around 80 degrees. After I had mine running I turned it off, removed the tank to check the water there. It felt quit warm to me and I am very happy. The reason I bought a warm mist was because mold growth is common in cold mist. I am happy with the warm mist option even if the mist loses heat as it travels up the tube.*Haven't had any leakage problems - I always make sure that the cap on the bottom of the tank is lined up correctly and very snug. I've read reviews about other machines that have leaked so I'm careful. In addition, I have the humidifier sitting in a clear baking dish for added peace of mind. I have hardwood floors and id rather be safe than sorry.*Night light feature - Very bright (possibly too bright) for bedroom but nice if unit is in a living room or space where a night light is nice to have. Light is easy to turn off. Display light provides less light than night light setting, which is more suited to the amount of light you may want in a bedroom at night.*Has a sleek appearance. I personally think it looks nicer than most humidifiers.*Sound - overall very quiet. When placing a filled tank in position the unit gulps several times to fill the space under the tank, after that the unit gulps once or twice maybe every 30 min on setting two.*Settings - has three settings, which I like for control. Going by memory and not the specifications written in the manual, if I have it on setting one then i typically fill the tank about the 3rd day. Setting two lasts maybe a little over 24hrs. I don't know about setting three because I rarely use it.I like the first two settings the most. The 3rd setting puts off a lot of mist but because the mist becomes heavier from the high output, it seems to not go out far and drops quickly toward the floor. With that said, I haven't seen any condensation or water build up on the floor as a result. If I were to use the 3rd setting more regularly, then I would probably set up a fan on low to move the mist around the room better.Cons;*The internal hygrometer is not accurate. When I researched humidifiers it became clear to me that internal hygrometers generally do not work. Perhaps its too close to the water source, not sure. So, when I compared different units I didnt bother with hygrometers being a pro or a con. I think of it as a setting not used. Knowing that, I planned on purchasing a separate hygrometer. I placed the hygrometer with my cello and can easily adjust my humidifier accordingly.*Night light - if you like to sleep in a dark room then the night light is too bright for you. Yes, you can turn it off but the display light may be too bright too. I feel that you can easily fix this problem by either turning the humidifier so the display is towards a wall, maybe close to wall, or by simply covering the display with cardboard, thick fabric, etc. You could tape/attach item so that it's like a flap, that way you could flip it up to see the screen when necessary.

Size does matter when you dont want to refill every day. Works very well. Love the color. Price was better than the big box store, just had to wait a few more days than picking it up next day at local store.

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