At what temperature do flue gases condensate?

Flue gases condense at approximately 130°F (54°C). The process of condensation occurs when the temperature of the flue gases falls below the dew point, which is influenced by the moisture content of the gases. When flue gases cool down to this temperature, water vapor begins to condense into liquid water, which can lead to issues such as corrosion and reduced efficiency in heating systems.

While other temperatures presented in the options might be close, the critical point for flue gas condensation for most heating applications is typically around 130°F. This is important for those working with heating systems to ensure proper design and operation that takes into account the efficiency implications and potential damage from condensate.