[out_of_protocol]

technically speaking, you can crank up internal fan speed to eleven and get exhaust temperature slightly above current room temperature even if internals are way too hot. regular resistive heaters do that, with their heating elements fired up way past boiling water temperature

[pandaman]

The problem is not the exhaust being too hot, but the heating element being too cold. Gas furnace, for example, burns gas at temperatures much higher than that of boiling water.