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Steam Boiler -- Should it be left on all the time?
The reason for the idea of leaving the boiler on all the time is to prevent corrosion within the boiler. When you leave the boiler off, it is not circulating the treated water that has the necessary chemicals to counter oxidation. Many boiler systems will either preheat the water or inject an oxygen scavenger to reduce the oxidation to the boiler metals in contact with the water. The reasoning behind leaving it on all the time in an idle or low fire state is to keep the water hot, which also reduces the oxygen in the water. While ON, it would also be circulating the needed chemicals to protect the boiler inside.
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