I have a First co. Hydronic heater I need to age. The Date code is Y07. When I look up at http://www.buildingcenter.org/content/hvac-production-dateage It tells me the year of manufacture is 2015(Y)
. It is in a 26 year old townhouse and I am thinking it is original. Is it possible that Y is also for 1988 or 89?