After three months of operation, both steam and ultrasonic systems were present. Of the two, I preferred the steam system because it left no traces of steam on the objects it touched, had fewer parts, and was more reliable overall. Got advantages: hydrates the air naturally and effectively. Quiet, smartphone control (actually, without it, not much would have changed) Cons of it: Regular washing and lubrication are required. The network has more information on preventative steps that can be done.
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