recs on who to fix an OLD oil furnace?

oil-fired furnace for hot water and steam heating, has not been on since Feb or March, and was under a bit of water for some time (do not know exactly since I just moved in recently).
I’m looking for recs on professionals who know this type of heater very well.
This is the last straw before making the decision on a new boiler/furnace or switching to gas. Gas would be nice but plumber (with Coned) decided that my 1″ gas line is not enough for the house, and digging is expensive…

By townhouser |