Not sure. I am just saying for a therapeutic aspect a sauna is night and day better than a jacuzzi. We had one at our first house, and granted it was an older model but the thing never worked, never got hot, always something wrong with it and when it did work we rarely used it. Just a waste of space IMO. But to each their own I guess. If I had the space where I am at now I would build a 2/3 person sauna in a minute. I grew up with one and those things make you feel like a million bucks. Nothing beats working out and then sitting in that for 20 minutes or so. For the jacuzzi its a whole production, getting the top off, heating it up, getting out wet etc