Need some advice on baseboard BTU and length

Discussion in 'HVAC Heating & Cooling' started by mrmackster, Sep 14, 2020.

  1. mrmackster

    mrmackster New Member

    Joined:
    Jan 6, 2018
    Location:
    Massachusetts
    My plumber is coming in two weeks and I wanted to be able to have an intelligent conversation about this.

    I remodeled my second floor, all new insulation, windows, and R60 in my attic. The previous owners converted from steam radiators to hot water baseboard 20+ years ago and I am pretty sure they put down way too many feet of baseboard and now with the remodel its even worse. I need to replace the baseboard in two rooms due to damage. The rooms are small, 12x10 and 11x10 with two windows each. They have 2 six foot sections of fins! Everything is in series and there are the last two rooms in a 5 room loop (all about 2700-3000 BTU required)

    I used coolcalc and slant fin's tool to figure out BTU requirements and they both came up with about ~2700 BTU per room which is only about 5-6 feet total of baseboard. Should I downside from 2 six footers to 2 three footers? Anything I should be concerned about? Right now I run at 180 degrees, but I would like to lower it at some point to get it to condense better, but I am sure if that means I should be putting the same amount or less of baseboard. Any advice would be appreciated, my plumber is more of a water/waste plumber and less a heat plumber.
     
  2. fitter30

    fitter30 Active Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    If your just wanting to lower the capacity the fins can be covered and that will stop the air flow rising . Another way is a boiler reset control that will vary boiler temperature by outdoor temperature
     
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  4. mrmackster

    mrmackster New Member

    Joined:
    Jan 6, 2018
    Location:
    Massachusetts
    Yeah, was just reading that. Maybe a good idea to just replace what's there now and cover the fins later if needed. And yes, my boiler has an outdoor reset functionality, but I am skeptical it will work correctly in my configuration.
     
  5. fitter30

    fitter30 Active Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Minimum water temp on a cast iron boiler is 140* return. Baseboard really don't start to heat till 120*. Reset will save energy if you need 180* at 0* you won't need 180* at 65*. Easy set point 180* at 0* 140* at 65* 1* change outside temp .6* water temp.
     
  6. mrmackster

    mrmackster New Member

    Joined:
    Jan 6, 2018
    Location:
    Massachusetts
  7. fitter30

    fitter30 Active Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
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