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B-vent Efficiency

Post in 'It's a Gas!' started by Ehouse, Sep 21, 2011.

  1. Ehouse

    Ehouse Minister of Fire

    Joined:
    Jul 22, 2011
    Messages:
    936
    Loc:
    Upstate NY
    Why are b-vent stoves less efficient than direct vent and by how much, in general? Is it because using room air pulls in cold air through infiltration? Seems like this wouldn't cause that much of a difference. I would think they'd be at least as efficient as an air tight wood stove. I have a Hearthstone Sterling B-vent that needs a gas valve and am wondering if I should bother to fix it since B-vent stoves seem to get such a bad rap.

    Ehouse

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  2. webbie

    webbie Seasoned Moderator Staff Member

    Joined:
    Nov 17, 2005
    Messages:
    12,289
    Loc:
    Western Mass.
    Using room are in this case does lower the efficiency quite a bit - especially since the flues on these are usually open all the time - that is, air moves up them constantly even when the stove is not on.
    However, it would still be as efficient as most wood stoves! As an example, a good B-vent gas stove might be 60% efficient, while a top direct vent might be 75%.
    Most woodstove fall in that range also.

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