The barrel sauna is beloved for a reason – it is designed with efficiency in mind. The traditional barrel design takes up less floor space and, due to its cylinder shape, has a smaller internal volume which translates to quicker heating time. The Igloo garden sauna, on the other hand, is more spacious and has a higher ceiling. The sloped roof is perfect for mountainous areas and anywhere else with significant amounts of snowfall. The up-right standing sauna is very popular among the small garden owners. This type of sauna takes as much space as a medium-size hot tub. In addition, this sauna requires very little time to heat. On the other hand, the rectangular outside wooden sauna has the biggest volume and it can fit up to maximum 12-16 persons. The square saunas are usually heated by wood-fired heaters since their effectiveness is comparably higher. To sum up, all above-mentioned saunas are great and each person will choose the design which would best meet his needs.