While the Langstroth, Warré, and top bar hives are the most popular, several others are used by beekeepers. The Flow Hive is one of them, and features a unique design intended to simplify honey harvesting. This hive is relatively new and was designed in 2015 by Australians Cedar Anderson and his father, Stuart Anderson, who crowdfunded the idea. While the structure of the hive is wooden, it contains plastic combs that are filled by honeybees. A mechanism inside this hive breaks wax caps, allowing honey to flow freely out of spouts fixed to the bottom of each comb.
The advantages of this hive type include minimal mess during honey harvesting and a clean hive for the bees. The plastic used is BPA-free, making it suitable for food contact and safe for bees. However, the cons lie in the price of this hive. Its advanced design and multi-material construction make it pricer than other hives.
Flow_Hive: https://en.wikipedia.org/wiki/Flow_Hive
Types of Beehives and Bee Boxes: Managing Colony Growth: https://bestbees.com/types-of-beehives-and-bee-boxes/