I inspected a home that had a Steward-Warner Winkler Econo Section Boiler SN# E-27192-D. I am looking for information on the age. My guess would be 1992, but I want to be certain. I searched google for hours but could not find the info I was looking for. Does anyone know how to determine the date on this unit? For that matter is there a site on the web that inspectors could use as a ready reference for the age of any component?