Micro-combustion calorimeters provide a direct measurement of heating value. Fuel is premixed with the process sample and completely incinerated by a carefully metered flame. A thermocouple measures changes in the flame temperature. An increase in the temperature is directly proportional to the heating value. This analyzer provides a continuous, direct measurement of the heating value with a very fast response time. It has a universal response and is not susceptible to flameouts or pressurized systems.