I filled it with water and ran it for about 10 minutes when I bought it, but it wasn't what I expected, so I'm selling it. Of course, it's used, but it's completely dry. Please consider it after looking at the usage and photos and being satisfied. Up to 14 tatami mats (pre-fab Western-style room) / Up to 8.5 tatami mats (wooden Japanese-style room) Humidification capacity (in standard mode): 500ml/h Tank capacity: 5.0L External dimensions: Height 375mm, Width 375mm, Depth 175mm Please see the manufacturer's website for details: https://www.dainichi-net.co.jp/products/humidifier/lineup/rxt_special/ Thank you for looking.