This temperature range is mainly because butane will generate a lot of heat energy when burning, which will increase the flame temperature. Butane is a common gas fuel. When burning in air, the flame temperature can reach about 1970℃, which is not fixed and depends on combustion time, oxygen content and other factors.

If the combustion time is long, the temperature of the flame will increase accordingly. In addition, if the oxygen content is insufficient, the combustion speed of butane will slow down and the temperature of the flame will also decrease.