The Bullfrog Model 331 is our most compact spa model. The small footprint of this spa allows it to fit through most doorways and is often installed in interior spaces. This spa is unique in that it can operate on a standard 110v outlet or 220v. The 331 is also the lightest spa, making it a great choice for smaller decks and balconies. The 331 accommodates three people and includes a lounger seat with additional calf jets. The three JetPaks provide a variety of jetting and are powered by one pump. This spa is the ideal choice for empty nesters and couples.