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Through tank or heat exchange surface modifications, condensing water heaters extract more sensible heat from the combustion gas, lowering the temperature enough to cause moisture to condense out of the combustion gases, thus capturing a significant portion of the latent heat energy.
This is because the dew point of flue gas is about 140 degrees F for natural gas, so in systems where the return water temperature is higher than 140 degrees F, conditions are too warm to allow the flue gas to condense.
When warm water vapor in the air comes into contact with cool surfaces like glass lenses and windows, the moist air often condenses into liquid droplets on the surface.
In recycling architectural fragments, Pernice condenses the grimy reality of mass transit into forms that quote its structures.