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Riser Size

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.



  • nicholas bonham-carternicholas bonham-carter Member Posts: 6,215
    riser replacement

    depending on how old your boiler is, the riser, and bushing may be time-consuming to remove for this time of the year.

    how is the boiler performing?--nbc
  • AbracadabraAbracadabra Member Posts: 1,568
    riser sizes

    See page 14 and 15.

    Near boiler piping needs to match manufacturer specs.  You can go back to 2" at the output of the header.
  • [Deleted User][Deleted User] Member Posts: 36
    Riser Size

    I just had the oil company do a service on the boiler for the first time. The main filter was rusted out, the filter at the burner was nearly completely plugged, and I guess it needed some TLC. After the cleaning, it seems to be using more fuel! It might just be my imagination though. I won't touch the piping now because we can't be without heat. So if I read the reply correctly, after I get to at least 24" above the water line and make the 90 deg to the mains, I can go back to the 2". Also there is currently only 1 main vent on the return, but that will be for another time. Thanks again
  • nicholas bonham-carternicholas bonham-carter Member Posts: 6,215
    when to vent

    do the main venting improvements now so you can save money this season, and not have to wait until next winter.--nbc
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