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Thread: Want to update

  1. #1
    Join Date
    Oct 2005
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    I have a National-US model 99A-W-5 PA Propane water boiler.
    AGA input 108000 BTU
    AGA output 84600 BTU
    Net IBR 74800 BTU

    I believe it's about 30 years old. It's in a 1100 sq ft house. A couple of years ago we finished the basement and added registers on both ends of the basement and in the basement bathroom.
    My question is what is available in a high efficiency boiler? What should I look for?

  2. #2
    Join Date
    Jan 2004
    Post Likes
    Weil McLain Ultra 155.

    Condensing modulating boiler with outdoor reset.
    Contractor locator map


    How many times must one fix something before it is fixed?

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