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  1. #1
    Join Date
    Oct 2009
    Posts
    23

    Baseboard Calculation

    HVAC tech came today as we will be converting from oil to NG in a few weeks. In addition to the boiler conversion we are adding "supplemental" heat to our bonus room above the garage. I have already insulated the knee walls but not much help. Can't afford to redo the ceiling of the garage. However, I am concerned about his calculation on how much baseboard we need and am looking for some feedback.

    24x16 with 8' ceiling
    3 exterior walls
    1 door
    2 3x6 Low-E double windows

    The room does have heat however there is a 15 degree differential btwn the main part of the house and the bonus room. The bonus room does have its own return. We typically keep the door closed all winter b/c it does have its own return and if left open really just disperses the cold air into the upstairs area.

    HVAC tech said 23ft of baseboard at 500btu/hr/lf would be more than adequate.

    1) with the current system, it is almost as if there is no heat b/c it is so cold (typically 50 degrees all winter long). Should he be addressing the room as if there is no heat being supplied in there?

    2) should we ask him to install 23' of the SF Multipak80 baseboard that can have an output btwn 660-900? (I think)

    3) We are fine with the room being heated at 65, so how much baseboard would we need to get it to 65 from 50 degrees? I don't want to have to set the t-stat to 80 to get 65. The room is not used on a daily basis....or it hasn't been b/c it is so darn cold in the winter.

    Thank you.
    Dan K.

  2. #2
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Is this great room built over top of the garage?

  3. #3
    Join Date
    Oct 2009
    Posts
    23
    yes it is

  4. #4
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,994
    There is 3413 BTU per KW of electric heat. Are you using electric or gas heated water to heat the baseboards?

    Where are you located?

    EDIT: Just saw you were getting a boiler, but where you are located is still very important.
    Check out my YouTube channel - http://www.youtube.com/user/skyheating1 We have customer testimonials, product reviews and more!
    Like us on FACEBOOK if you like our advice here!

  5. #5
    Join Date
    Oct 2009
    Posts
    23
    Sorry for lack of info. We have hydronic forced air heat so HVAC tech will be installing h/w baseboard. Thanks.

    We are located in the lower portion of New York State. On the Northern NJ border.
    Last edited by DanInNY; 09-22-2011 at 04:27 PM. Reason: More Info Added

  6. #6
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by DanInNY View Post
    yes it is
    That means that you need to consider double exsposure. One of the biggies we see is builders putting master bedrooms over the garage and not enough H/C to the room.

  7. #7
    Join Date
    Oct 2009
    Posts
    23
    Yes, understand that is a huge problem with builders. Since the pitch of the roof over the garage is lower than the pitch of the roof over the main house, we cannot even access the "attic" over the bonus room to add more insulation. Although I do realize the ceiling of the garage is also an issue. So how and what do I tell the HVAC tech and how much baseboard do we need?

  8. #8
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by DanInNY View Post
    Yes, understand that is a huge problem with builders. Since the pitch of the roof over the garage is lower than the pitch of the roof over the main house, we cannot even access the "attic" over the bonus room to add more insulation. Although I do realize the ceiling of the garage is also an issue. So how and what do I tell the HVAC tech and how much baseboard do we need?
    It is hard to even give you a reasonabe idea without a heat loss load on that room. Does he have it layd out for baseboard on the three exterior walls?

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