I actually just upgraded my infrared sauna a couple weeks back. I did a lot of research on the internet and it took me months to choose one. I found that the best infrared sauna is made by Clearlight Infrared Sauna. They have the best infrared heaters on the market because they utilize both ceramic and carbon elements. They have the only combination heater on the market and the craftsmanship is amazing. I had a Clearlight one person infrared sauna, but since I recently moved I had room for a bigger one. So, I sold it online and purchased a four person from the same dealer. Just check out their website they have a wealth of information.