This is temperature at which the water vapor in the products of combustion begin to condense, so causing very acidic damage to steel flues, furnace components etc. any surfaces of the stove cooler than dew point temperature will have condensate appearing on it.

Dew point temperature is the saturation temperature corresponding to the partial pressure of the water vapor in the gases.

 

 

Let the product of combustion are

A*CO2 + B * H2O + C * O2 + D * N2

Partial pressure of water = ((kmol of H2O)/(kmol total))* Patm

                                

 

 Look up your STEAM TABLE and find the corresponding saturation temperature.

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