May 01, 2019 - 06:55 AM
Thank you for contacting Biobidet Support.
The DIB is the only "premier Class" model that has a Round seat option. The Premier class has unlimited warm water where the Luxury class has 30 seconds of warm water.
The DIB open box is not return/refundable but still is brand new and carries the 3 year full warranty. The open box really is only considered open box due to a part removed and replaced such as install hardware and therefore considered "open" but in no way previously used by a consumer.
Source: DIB Open Box