An improved analyte system where a temperature sensor and heater element combination are placed within a protective sheath. The sheath, temperature sensor, and heater element are placed within a reaction vessel so as to provide an internal heating source for reactive materials contained within the reaction vessel. The sheath extends through the reaction vessel into a reaction volume area of the vessel where an analytes-reagent reaction takes place. Further, the sheath is coated with a catalytic material, preferably platinum. The heater and sheath assembly may be introduced to any number of reaction schemes where reaction rate and detection acceleration is desired. The heater and sheath assembly works in conjunction with software to tune heating rates, optimum temperature, cooling rates, and detection analysis.