It is a hot tub suitable for 6-7 persons and fits around 1 cube of water. The heater for this kind of hot tub is connected outside.
The shell for this hot tub is produced from fiberglass.
This model and size hot tub heats with firewood for around 2-3 hours, however, real heating time depends on the quality of the firewood, skills of the person, initial water and air temperatures, and cover type.
The recommended temperature for use is 36/37 degrees (Celsius).