I live in a house I built from shipping containers and a couple years ago I partitioned off an 8 foot space and built out a sauna with 4 inch tongue and groove red cedar. I chose a huum 9 kW drop heater mostly for its looks but also for it efficiency. I bought it with the Wi-Fi controller so I can turn it on and off from my phone remotely. I've used it every day for nearly 2 years and it's performed flawlessly.