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Stove Efficiencies

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by Tedinski, Nov 5, 2013.

  1. Tedinski

    Tedinski Member

    Joined:
    Oct 16, 2013
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    Loc:
    Northwest Pennsylvania
    My stove is supposedly 85% efficient. Not bad, right?
    I got to thinking... what are the efficiencies at low and medium burn rates? I have a CAB-50 and I just have low-medium-high control.

    The convection fan seems to take forever to come on. Fuel can be burning in the pot for as long as 10 minutes before the fan is engaged. That's a lot of wasted heat!

    Has anyone heard specifications on high vs. low burn, and efficiency?

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  2. maineah1214

    maineah1214 New Member

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    Maine
    I think it's to avoid blowing cold air around in a cold room. Think of it as working itself out since it runs for 10 mins after the fire goes out, blowing off the remaining heat :) sorry i can't answer your question.
  3. bbfarm

    bbfarm Minister of Fire

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    wisconsin
    Also you wouldn't want any start up smoke to blow into your room. It gives that a chance to be sucked out the vent.
  4. briansol

    briansol Minister of Fire

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    central ct
    The fire warms up a heat sink. Nothing more.

    When that heat sink is hot, the room blower passes air over it to warm it.

    If it's not HOT, the air doesn't get warm.
  5. boosted3g

    boosted3g Feeling the Heat

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    Central PA
    It would be my guess that the stoves peak efficiency is reached when it is at least half it's rated output. I know my Harman is not efficient when it's run very low and the evidence is in the color of the ash. When I have it near half way on a really bitter cold night the ash turns a really light gray almost white with no buildup in the front of the pot compared to dark and piling up when it's just above an idle.
  6. john193

    john193 Minister of Fire

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    This is why it is important to size the stove for the house. A powerful stove always running on low to medium isn't utilizing its full efficiency.
    briansol likes this.
  7. Woody1911a1

    Woody1911a1 Feeling the Heat

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    Marblehead , Ma
    you're WAY over thinking this thing . put pellets in . enjoy being warm and saving money at the same time :) my opinion .
    Jack Morrissey likes this.
  8. briansol

    briansol Minister of Fire

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    No, they are right. on low and high, the stove is not super efficient. it's most efficient on medium. Size it for that metric.

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