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My boiler is probably about 40 years old. Weil McLain, single pipe steam, parallel system and it works well with professional occasional maintenance and regular maintenance by me, the homeowner----no complaints. I have no intention of replacing it if/until I absolutely have to. That being said, I have a question. I live in the Chicago area and we recently had record breaking low temperatures. My stat tracks running time of my boiler, and even on these recent bone chilling days, the most my boiler ran was about 12-13 hours in a 24 hour period. Would that indicate to you that it's oversized? Just wondering in case I ever have to have it replaced.