Efficiency of Jensen Wood Furnace

Tinytorpedo Posted By Tinytorpedo, Jan 22, 2018 at 4:28 PM

  1. Tinytorpedo

    Tinytorpedo
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    Feb 8, 2014
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    Wondering if anyone knows the efficiency of a Jensen indoor wood furnace like this?

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  2. U.P.Boiler

    U.P.Boiler
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    I had one similar. Came with the house I bought. It was a fire breathing dragon in the basement. Kept the house uncomfortably hot, 25 below outside and 80 inside. I had windows cracked open. It was old and at the end of its usable life but for an upper peninsula winter with older windows and decent insulation in the roof area I was burning 6 to 8 cords of wood a winter. Downfall was the mess was in the basement. Bugs, mice, dust and dirt. Nice thing was that I could stoke it in my tighty whities instead of going out to the boiler.

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  3. brenndatomu

    brenndatomu
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    The efficiency rating? Probably 60%...a good operator might squeak towards 70% out of it...maybe...on a good day...
     
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  4. Tinytorpedo

    Tinytorpedo
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    Thanks for the reply. About how many SF was your home?
     
  5. Tinytorpedo

    Tinytorpedo
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    60% ?, that is what I was afraid of. Thanks.
     
  6. maple1

    maple1
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    I am thinking 60% could be an optimistic estimate. There are all kinds of variables though.

    My number guess is, 'not very'. :)
     
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  7. U.P.Boiler

    U.P.Boiler
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    I have a 2300 as ft of actual heated space. The best thing you can do is seal your house up. Windows and door seals. Check being door and window moulding. Replace old windows if needed. Make sure you have adequate ventilation in the attic areas. Once that is done you will be surprised that you won't want to fill that fire breathing dragon as much.

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  8. laynes69

    laynes69
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    I was thinking in the 40% range, considering high stack temps and creosote. Epa tests default at 60%.
     
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  9. Tinytorpedo

    Tinytorpedo
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    I was told by the company that bought out Jensen that the efficiency was 73%.
     
  10. JRHAWK9

    JRHAWK9
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    ;lol
     
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  11. Tinytorpedo

    Tinytorpedo
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    I was not disagreeing with the previous input, just wanted to share what the manufacturer had to say about efficiency. Thanks much for your comment.
     
  12. TCaldwell

    TCaldwell
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    What’s your flue temp with this unit
     
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  13. Tinytorpedo

    Tinytorpedo
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    This furnace is in a retirement home I purchased and we have not moved into it yet. We will be moving there soon. What flue temperature should I be expecting?
     
  14. 3fordasho

    3fordasho
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    Not sure what you will see with the Jensen, but a EPA rated furnace like one of my Drolet Tundra's will see 350-400F flue temps during the active part of the burn - meaning good active flames and secondary flame action. I get some variation due to draft differences due to lack of a barometric damper. On a cold and very windy day, my temps will run higher but again this is due to the draft being on the high side. Also this is with wood with an actual moisture content at 20% or a touch less.

    My EPA rated free standing stove, a 30NC can see 600-700F flue temp during the same part of the burn, a clean burner as well but due to no heat exchanger it's allowing more heat up the flue so efficiency takes a hit.
     
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  15. JRHAWK9

    JRHAWK9
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    sorry, I can be a sarcastic a$$hole at times. ;lol

    This is my life's moto. ;lol

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    Seriously though. Don't believe anything manufacturers tell you unless you see the test report for yourself or they are citing the CSA B415.1–10 testing procedure. Even then you have to make sure you are looking at the correct efficiency number. Input and burning efficiencies are useless. Stack loss efficiency, delivered efficiency and LHV are the ones to look at. Stack loss being the most accurate measure of heat NOT lost solely up the chimney.
     
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  16. Tinytorpedo

    Tinytorpedo
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    Thanks.
     

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