originally used a "Cool Mist" system. This is where the liquid is not under pressure and gets pulled into the mist head via a venturi system. I found it was very fidlely, took time to get it started if I used it infrequently and needed constant adjustment. I switched to a "Fog Buster" style where the liquid is under pressure and mixed with the air stream just before the output. Could not be happier with this one. Stays in adjustment. only takes a second to feed the liquid if it has been off for a day or longer.
