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Big old steam tube boiler - can I insulate it?


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It is quite likely that it has ceramic fiber or rock wool insulation blankets between the boiler shell and the jacket. If the surface temp is < 130F, it's insulated.

The rear of the boiler is radiating a fair amount of heat.

The rear of the boiler is a door to access the tubes. The door is lined with refractory cement that can fail and need replacement.

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