What is the temperature of heat generated from LPG gas? I'm working on a project and I require around 300-400 degree Celsius of temperature. As of now I'm taking the normal LPG gas that is available in our house for cooking purposes for my project, but I'm not sure whether it can reach 300-400 degree Celsius or not? I can definitely use multiple burners but how much heat/temperature does 1 burner generate?

Maybe I'm wrong because heat is counted in calorific value, but then how do we know the temperature of that calorific value? Or is there some relation which says that x amount of LPG would give x degree Celsius or maybe x calorific value? But yet again, how can I know the temperature?
LPG is mostly propane and butane both of which have adiabatic flame temperature near 1970 degrees C when burned in air.  See Flame Temperatures of some Common Gases.

So 300-400 degrees C is certainly reachable.