What is the minimum temperature at which a hot water boiler should operate to prevent condensation?

To effectively prevent condensation within a hot water boiler, it is essential to maintain the temperature at a minimum level where the flue gases and combustion vapors do not cool down to the point of condensing. The correct response of 170°F is identified as the minimum operating temperature for a hot water boiler.

When the boiler operates at this temperature or higher, it effectively ensures that the flue gases remain above their dew point. The dew point is the temperature at which water vapor begins to condense into liquid water. If the boiler operates at lower temperatures, condensation can occur within the boiler and the venting system, leading to issues such as corrosion and reduced efficiency.

Therefore, maintaining a minimum operating temperature of 170°F safeguards the integrity of the boiler system and enhances its operational efficiency by preventing damage that could be caused by condensation.