Modern owners often try to have something exotic in their summer cottage so that no one else has anything like it. This is exotic, of course, the Japanese bath culture is not very well known, their baths are not as popular as Russian or Finnish.
The photo shows only one of the elements of the Japanese bath. In fact, in our conditions it is a barrel filled with water. Inside you can see the bench on which you can sit. Traditional Japanese options include a stove that maintains a constant high temperature of 45 °. For our area, especially for a summer residence, such a simplified version is also suitable.