It's about the steampot. Don't order that model whatever you do. I had to have the steamer replaced 3 times and eventually I gave up and got my money back. The one I showed you has a high-quality steampot. That is why it cost a bit more. DON'T make the same mistake I did. I read somewhere about infrared rays interfering with ozone. Plus, infrared saunas severely dry out the skin. Steam is so much more relaxing.