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I'm trying to hire a contractor to install a new oil-fired steam boiler and one of the contractors, discussing what size boiler I would need, said that boilers come with 3, 4, or 5 sections. (He might have used another word other than sections, "panels" perhaps.) He knows that I have a two-family house in the northeast, and he said 3 would be too small and 5 would be too big, so he said the correct size for my boiler would be 4.
He is quite experienced and comes highly recommended, but this sounds like a strange way of sizing a boiler to me. The implication seems to be that the number of panels corresponds to certain BTU range, which he is reasonably certain applies to my boiler.
Would anyone care to comment?