A sauna is normally the sign of a relaxing time, but this is not the case in the film 247° F, as a sauna plays the villain role. The premise involves four college kids vacationing at a cabin (sound familiar?) who get locked inside its custom European-style sauna. With the control panel on the outside, the tension mounts as the heat continues to rise.
What's interesting about this one is that the sauna doesn't directly inflict death upon its victim (spoiler alert, only one of the characters dies). Instead, the heat causes him to go into hysterics and he presses his body into the red-hot coals in a last-ditch effort to cool down the room. And you thought walking across hot coals was rough.