My home, built in 1931, was originally a coal fired two pipe steam system. In the 70's the owner replaced coal with a weil mclain 76 series boiler. i believe my home has too many radiators (1500 sq ft of steam edr) which is logical since energy was cheap and people slept with windows open etc. On top of that, I believe my boiler is oversized for the number of radiators I have. Originally my boiler was fitted with a 4.25 gallon/hr nozzle. Now it is fitted with a 2.8 gph nozzle. right now i'm burning roughly 3000 galllons of oil per year for a 4000 square foot house. Seems excessive to me. Even if I reduce the size or amount my radiators wouldn't the existing piping still require me to use a large boiler?
I'm thinking of switching to hot water but i understand that there are pitfalls that need to be avoided. My radiators are connected at the top and could be used for hot water. I would like to insulate my house a little better and have a heat loss study performed before switching to hot water so I can be sure that I have the proper size boiler and correct number of radiators.
Does switching make sense? If so, does the large size of my steam pipes eliminate the efficiency savings provided by a hot water system. Could some sort of flexible plastic pipes be snaked through my large steam pipes to neck them down ? That would also prevent leakage problems.
Or an alternative would be to keep steam or a combinatio of steam on my 2nd floor and hot water on the first since piping the first floor would be easy from the basement.