There may be a question of what is meant by this.
Temperatures in North America are limited to 900C (1940F). In Europe, temperatures can be as high as 1100C. Some prefer temperatures hotter than is allowable.
Also the 900 is measured at the ceiling above the sauna heater (the hottest spot). The temperature across the sauna at the seating area can be 10-150C lower.
In home saunas, we find complaints of low temperature often result from misplaced or inaccurate thermometers. Some people sit the thermometer on the bench top-not an accurate reading.
Also, over the last number of years, we have found thermometers to be inaccurate. They are slow responding bi-metal mechanism. In fact, we test every batch of thermometers we receive. And then we calibrate them to "more accurately" reflect sauna temperatures at the high end of the scale.
If a sauna is sized correct, within one hour, it will heat the sauna to the desired 900C
Public saunas are more regimented, so it may be that the sauna is not set a high enough temperature.
