The NSI-57, one of our most popular models, is amazingly roomy, yet only takes up 35 sq. ft. of floor space. With an L-shaped top bench, it comfortably seats four or five people and plenty of room for two to lie down. The NSI-57 includes a Viki 6.0 kW stainless steel heater with SaunaLogic2 control and mobile app. Simply assemble, plug it into the closest dedicated outlet and you’re ready—no finishing work, no plumbing and no electrical.