rjaacks Posted December 16, 2010 Report Share Posted December 16, 2010 Trying to determine the age of a Williamson Temp-O-Matic natural gas furnace. Model #1117-10-5 Style 131 Anyone help? Quote Link to comment Share on other sites More sharing options...
MMustola Posted December 16, 2010 Report Share Posted December 16, 2010 According to my Preston's Guide, that model number was made in 1978, 79, and 80. It is 100,000 btu. Quote Link to comment Share on other sites More sharing options...
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