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    Zapmaker's Avatar
    Zapmaker Posts: 2, Reputation: 1
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    #1

    Jan 29, 2010, 08:49 PM
    Older rheem furnace efficiency ratingl
    What is the efficiency rating for a Rheem furnace Model RGDA-125A-GR, Serial CN30102 F1388 8119, Category I. It was installed new in 1987. Input 125000 BTU and it did not give an output number.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jan 29, 2010, 09:04 PM
    Does it have metal or plastic exhast?
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    T-Top Posts: 1,871, Reputation: 100
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    #3

    Jan 29, 2010, 09:08 PM

    Furnace have came along way in ratings from 1987 to now why do you ask. It will not qualify for the stimulas rebate credit.
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    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jan 29, 2010, 09:27 PM
    Between 65 to 73 % depending on spark ignition or not or automatic flue damper or not. This is for a old style metal flue type discharge model. Now a smart service person armed with the proper tools and extra orifices can usually add and extra point or 2 depending upon there lever of expertise. These furnaces were always sized to big so you shrink them down to the size for the structure and gain a little bit of efficiency.

    The nice part about these older units is they do not break near as often as the new stuff. You save gas with the newer style units but spend it back on parts and labor to keep it running plus you will not see the newer units lasting 25 or 30 years like the old stuff. Just the facts.
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    T-Top Posts: 1,871, Reputation: 100
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    #5

    Jan 29, 2010, 09:39 PM

    I have to agree with Hvac1000. They don't make them like they used to. They made them to last back then.
    Zapmaker's Avatar
    Zapmaker Posts: 2, Reputation: 1
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    #6

    Jan 29, 2010, 09:47 PM
    Quote Originally Posted by Zapmaker View Post
    What is the efficiency rating for a Rheem furnace Model RGDA-125A-GR, Serial CN30102 F1388 8119, Catagory I. It was installed new in 1987. Input 125000 BTU and it did not give an output number.
    It has a metal flue and a continuous pilot. I want to know the output so I can size my new furnace.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #7

    Jan 29, 2010, 10:20 PM
    Let your installer figure it out,, he should do a manuel J,to figure what you need,, not compare to what you have
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #8

    Jan 29, 2010, 11:11 PM
    Never use the old equipment to size your new equipment. This is a big mistake and will cost you big energy dollars. To be accurate have a manual J done on your home. You will be glad you did and if the person you are dealing with does not know what a manual J is tell them to take a hike because they are totally non professional.

    Get more than one estimate and read the link below and believe what it says to save you a bunch of problems.
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  1. File Type: pdf How to pick a Contractor.pdf (309.7 KB, 132 views)
    2. shultzie's Avatar
    shultzie Posts: 1, Reputation: 1
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    #9

    Oct 30, 2013, 04:32 PM
    What's the BTU rating on a rheem furnace model 90rs10eq501
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