Red Seal Plumbing Practice Exam

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What problems can occur in a conventional boiler if the flue gases are cooled to their dew point?

Overheating and boiler shut down
Increased energy consumption
Draft hood spillage, or damage caused by corrosive condensate
Reduced efficiency due to scale build-up

The correct answer is: Draft hood spillage, or damage caused by corrosive condensate

When flue gases are cooled to their dew point, the combustion products in the gases condense into liquid form, creating acidic condensate. This acidic condensate can cause damage to the draft hood and other components of the boiler due to its corrosive nature. This can lead to potential draft hood spillage or damage, which can result in unsafe operation of the boiler. The other choices, while they can occur in other situations, are not directly caused by cooled flue gases reaching their dew point.