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New Yorker AP 590 firebox crack
I popped open the observation door today because I knew I had scraped the firebox with the brush while cleaning out the air tubes. Turns out the scrapes weren't as bad as the horizontal cracks around the three walls. The cracks look pretty old, (see pics). The boiler was installed in 94. Is this a big problem? The boiler doesn't get used that much. I had a large in wall wood stove installed in 2010 so I only use about 500 gallons of oil from November thru May. Maybe another 200 gallons for the remainder of the year for hot water.