The Sweat Box

A 1-seat red cedar kit at $5,545 with a 4 kW heater and a 3-year warranty, the only single-seat sauna and fourth-dearest per seat.

Sweat Box is the only one-seat model in our data, so its $5,545 is also its cost per seat, behind only the Sun Home Solaris 4, the Auroom Arti and the Solaris 6 among 85 models. It has the smallest footprint we track, 42 by 42 inches, about 12 square feet, and stands 80 inches tall. The 4 kW heater is 4 kW per seat, the highest ratio here, tied with the Sweat Kingdom Summit.

For $1,508 less you can buy the Almost Heaven Salem, which seats two in red cedar with 6 kW and a lifetime warranty. Sweat Box gives 3 years. No weight or shape is recorded. It makes sense only for a solo user with a very small space who wants a kit. Sweat Kingdom is the only store we list.