There is no need to store water in the tub, it can be cleaned with chemicals;
Plastic is more resistant to scratches or other type of damage;
Large size round tubs can fit up to 12 people;
Rectangular tubs hold more water than round ones;
Inside heater – heater which is placed inside the tub, it is separated by protective wooden fence. Inside heater warms up faster than external heater, but less people can fit inside the tub. 3 different sizes: 18kw, 22kw, 24kw.
External heater – mounted next to the tub, that is the reason why more people can fit inside the tub. 3 different sizes : 20kw (standard), 26kw, 30kw.