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Riser Size

avmechavmech Member Posts: 1
I just purchased The Lost Art of Steam Heat. After going through a few chapters, I went to have a look at my boiler. It is a Weil McLain SGO-3 and the specs call for a 2 1/2" riser. When this unit was installed, it was down sized to 2" due to the rest of the pipes being 2". My question is should this be replumbed with 2 1/2"? If the answer is yes, at what point can it go back to the 2" to meet the rest of the supply piping. I really appreciate any assistance. This is my second house with steam heat and I am trying to make this as efficient a system as possible.



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