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Other Thoughts: The water tray is shallow and doesn't hold very much, and the auto evaporation process can't always keep up. Fortunately, the unit automatically shuts off when the tray is full, so it won't overflow. Be aware, if the unit isn't sitting level it could spill before triggering the shut-off sensor.
I raised mine up and removed the drain cap/plug(2 parts) so it could drain continuously into a bucket. It pulled about a gallon and a half out of the air in one night. Before doing that it had filled the tray and shut down twice, each after about 30 minutes of operation.
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