7th week of 2003 is my guess. Not 20 yrs old with an Energy Star sticker on it. Another way to tell without contacting the mfr. is to compare input BTUs to output. Clunkers might be in the 60% range. Modern oil boilers are approx 84-86% AFUE.

Sometimes you will see the ANSI Std. date, which tells you it cannot be any older than that.

HTH,
Bob

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