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I see few modern boilers and have never taken one apart.

This 1994 Burnham boiler's right exterior jacket was badly toasted and deteriorated. When I removed the sheet metal exterior, I could see the boiler sections with these three metal plates bolted between them and sealed in place with high-temp caulk.

Are these plates original equipment, or were they a retrofit, or are they original equipment that's been re-fitted in place?

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Those are the routine manufacturer-designed 'boiler flue cleaning covers' Jim.. the flues get brush-cleaned by removal of those covers.. the spaces between the cast iron sections are 'accessed at that area'.. Soot, crap, sulphur (if oil)... etc..

They usually get re-installed with furnace cement ... If there was a major draft problem with the chimney.. sometimes it's evidenced there..

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Rob knows Burnham. Access plates for cleaning flueways 'tween sections.

Rob, have you ever see a boiler of the Burnham "Swasteeka" line? They have the swastika symbol on the end castings. The symbol meant something quite different before the 1920s.

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That sometimes happens to jackets when the heat shields adjacent to the burners fall out of place or deteriorate. Flue gases condense in the insulation behind the jackets.

I actually considered that and paid special attention to the condition of the firebox. It looked very good. Also, after running for several cycles, the outside of the jacket was still cool enough to touch. I suspect that whatever was ailing it had been fixed for the time being.

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