Steamist and ThermaSol are two of the industry's leading manufacturers in steam bath equipment, along with Mr Steam and Amerec. These, collectively, are the best the industry has to offer. Here is a clip from another post on this forum with helpful tips for selecting the right generator for your environment.
Board: General Discussion
Topic: Generator Lifespan
February 27, 2009, 07:46:07 AM by Hailey
As far as which generator series to choose, select one of the industry's leading manufacturers (Amerec, Mr Steam, Steamist, ThermaSol). Then the decision boils down to features and appearance. Which of these features are most important to you? Control and steam head/outlet finish, control features, coordinating light and sound systems, warranty, generator size and shape, drain system method, and tandem requirements are the leading determining factors for most people.
Start by sizing your generator, try this tool... www.steamsaunabath.com//catalog/generator_sizing.php
Then use the handy comparison tool (just select your top choices and click compare). When you have a good idea of what you like or some questions, give these guys a call and they'll walk you through it.