Hot tub is a tank of cylindrical shape, filled with water, intended for rest and relaxation. Learn more about beneficial effects. The tub consists of a wooden corpus, an insulating layer, an inner casing, wood stoves placed directly in the water and sitting benches. Each hot tub can be equipped with a wide range of accessories according to the customer's wishes. Water in the hot tub heats stainless steel stoves in which they melt with lumberwood.