For sauna, you need something like this:   Please login or register to see this link.   Quote: "The BE-23 (SW-1K) is a fixed-temperature heat detector. It contains a bi-metallic sensor with a contact which closes at alarm temperature, thereby transmitting an alarm signal to the central panel." That temperature is 150 degrees C. It is also IP55...   I do not own this product, I just happened to have this link in my collection of "specialty devices"...   Edit: you t