What is the effect of having too much dissolved oxygen in boiler water?

Having too much dissolved oxygen in boiler water can lead to the corrosion of boiler components, which is why this answer is chosen. When oxygen is present in boiler water, it can react with the metal surfaces of the boiler system, leading to the formation of iron oxides and other corrosion products. This corrosion can result in pitting, scaling, and even structural failure of the boiler over time, necessitating costly repairs and downtime.

While one might think that dissolved oxygen could potentially enhance steam quality, the negative impact of corrosion far outweighs any perceived benefits in heating efficiency or steam quality. Effective boiler water treatment involves reducing dissolved oxygen levels as part of preventing corrosion and maintaining the integrity of the system.