I still haven't been able to find out how old my boiler is. Here's what I do know:
Model Number: G-561-W-S
Serial Number: 61-19188
The information given on their web site says, "If the boiler was manufactured from 1984 to 1999, the serial number ends in a four digit date code. '123456-1284' would be manufactured in December, 1984. If the boiler was manufactured from 2000 to present, the serial number ends in a six digit date code. '123456-200505' would be manufactured in May, 2005."
Since my serial number doesn't fit either of these patterns, I have to assume it was manufactured before 1984, and that the last five digits are probably just a serial number.
The oldest IOM they have online is for the series 61/62. It appears to have been scanned from a printed document rather than produced from an electronic document. While the description of the 61-05 is very similar to my 561, there are some differences. For example, there's no skim port where the IOM says it should be.
My IOM says "series 61" on the cover, but doesn't mention series 62, and all the model numbers are G-#61 instead of 61-0# (where # is the number of sections). It only mentions 24-volt and Powerpile control options, while the series 61/62 IOM mentions only 24-volt and 120-volt. The ZIP Code is 19512, not 19512-0855.
Probably the most telling difference is that, on page 1, my IOM says, "This installation must conform with the National Fuel Gas Code ANSI Z223.1 - 1980." This fixes 1980 as the earliest it could have been made, but I don't know how frequently this standard was updated. Recent history suggests every 3 years, but extrapolating back from 2012 doesn't get you to 1980. The series 61/62 IOM is no help here. It says "The equipment shall be installed in accordance with those installation requirements of the authority having jurisdiction or, in the absence of such requirements, to the current edition of the National Fuel Gas Code ANSI Z223.1/NFPA54." No year is mentioned.
So the best estimate I can come up with is somewhere between 1980 and 1987, meaning it could be anywhere from 25 to 32 years old. Can anybody help me narrow it down?
Just another DIYer | King of Prussia, PA
1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24