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How much baseboard per room.

FTWIII Member Posts: 14
I am renovating all three bedrooms. I want to know the formula to calculate how many BTU's are required to heat each room. How many liner ft of baseboard per room. Each room is getting new insulation, new windows (they will be bigger due to egress regulations, and new exterior, foam backed vinyl siding.


  • CMadatMe
    CMadatMe Member Posts: 3,086
    edited August 2013
    That Would Require

    You to do a heat loss..


    Once you get that you need to pull the technical literature for the brand of baseboard you plan on installing and divide the heat loss of the room by the btu/hr per ft output of the board at the water temperature and flow rate you need to get your needed lengths. To calculate flow rate the formula is:

    gpm = btu/hr / (Delta-t x 500)

    Delta-t is the difference between the zones supply and return water temperatures. Example, a typical baseboard system uses a 20 degree delta-t, 180 supply, 160 return.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
  • Zman
    Zman Member Posts: 7,467
    edited August 2013
    Heat loss

    Step one- Do a heat loss calc. There are good free calculators on line.

    Step two- Determine your boiler design temp. Conventional boilers will usually be around 170. With condensing boilers, the lower the better (max. 140).

    Step 3-Look at the output chart from the heater manufacture and pick the size that matches your design temp and heat loss calc.


    Chris beat me to it, Oh well
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Rich_49
    Rich_49 Member Posts: 2,738
    Good advice

    What Chris & Carl said . Do the heat loss . Nothing to add .
    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC
    Serving most of New Jersey, Eastern Pa .
    Consultation, Design & Installation anywhere
    Rich McGrath 732-581-3833
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