Slant/Fin gas fired boiler ser.# 503333
Many thanks Les.
That information seems to be incorrect. The formula on that web site does not match any of the factory confirmed dates I have. Slant Fin has many different serial number formats. The only way to confirm a date of manufacture is to call them - 516-484-2600.
Bill, Slant/Fin confirmed late 80’s to early 90’s Thanks for your help.