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This is a 10 year old Lennox cast iron boiler. These outside sections have excessive rust for a relatively new boiler in my opinion. How serious is this? How would you write this up?

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Looks like the boiler castings sweat when it is shut down for the summer. They also may leak just a tad due to contraction. Common when a separate water heater is used. The owners can keep it on very low to prevent any leakage and keep the castings tight.

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