Blaze King Wood Stove CAT Thermometer with 4″ Probe. This thermometer is located on the top of the stove, its purpose is to show you if the combustor is active. Always operate the stove in the “active” zone. When the combustor is not active the stove will emit smoke and will not be efficient. For an accurate reading, turn fans off for approximately 10 minutes and then read the thermometer.