Biggest problem with a wood-fired tub is controlling the temperature. Max temp for most electric hot tubs is 104F or 40C with a high-limit that automatically shuts the tub down around 118F. If your body overheats, you may get dizzy, weak and even pass out.
Even in an electric tub with thermostat control, you can become hyperthermic especially if you have preexisting conditions
https://www.nbcchicago.com/news/local/two-elderly-women-stuck-in-hot-tub-at-kentucky-cabin-rescued-by-first-responders/3814261/
Both were overheated, developed hyperthermia and became unresponsive. One member of the group stayed in the hot tub to keep their heads above water while a fourth person called 911, authorities said. By the time rescue crews arrived, the caretakers of the cabin - who were also called about the incident - had gotten the women out of the water.
One woman was partially alert, while the other was completely unresponsive, authorities said. A search and rescue team member, who is also an EMT, assessed both women.
The unresponsive person was taken to a shower, where cold water and ice were used to cool her body's temperature. The less critical patient had ice and cold compresses applied and was moved outside, where she was cooled off by a hose.
After roughly 20 to 30 minutes, both women began to recover and were taken by EMS to a local hospital. As a result of the incident, the Wolfe County Search and Rescue team issued the following reminders about hot tub safety:
The recommended maximum immersion time is between 15-30 minutes.
Ensure you are capable of exiting the hot tub once you enter, especially if you have any sort of disability.
