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    dwarsen's Avatar
    dwarsen Posts: 1, Reputation: 1
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    #1

    Feb 10, 2013, 07:10 AM
    Duomatic olsen ultramax furnace
    I have a duomatic olsen ultramax furnace (93% efficiency) in my home. It was installed in 1985. What is the expected life of this type of Furnace?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Feb 11, 2013, 06:39 AM
    Hard to say. I have seen identical brands and models vary greatly. I just changed out a GE gas heater installed in 1974 that ran perfectly but the AC had been replaced twice.
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