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old baseboard specs/type/charts

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dpenny
dpenny Member Posts: 15
in Gas Heating

I have 1950s baseboard (75 linear feet) spaced around perimeter of house. Am trying to find charts of its output. The element is 3/4 copper, fins are ~1.5 deep, 3" tall, ~5 AL fins/inch. The casing is ~ 9"x2".

I have several "current day" SlantFin Charts. Can I use these?

Comments

  • mattmia2
    mattmia2 Member Posts: 13,436

    What are you trying to figure out? Is the heat inadequate or uneven? Are you trying to use a mod con and figure out what the lowest SWT you can use is?

  • bburd
    bburd Member Posts: 1,173

    A picture would help us to identify it, both of the element inside the cover and the endcap, which may indicate the manufacturer.

    Is that 75 linear feet of finned element, or casing? Only the element emits heat. The casing may also be used to conceal pipes.

    —
    Bburd
  • hot_rod
    hot_rod Member Posts: 25,324

    The SlantFin #30 is a square element, about 2X2". Sounds like yours is taller but narrower? And the enclosure is taller.

    Fin spacing has some to do with output also.

    These chart might get you in the ball park, yours may be a bit higher output

    Screenshot 2025-07-16 at 1.49.28 PM.png
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,209

    If you can't find it use the standard 2 x 2 element about 550 btu/ft at 180. It will be close enough. 75 x 550=41,250.

  • dpenny
    dpenny Member Posts: 15

    I had found the Slant Finn 30 table/chart, 2x2. I didn't know if it would be close enough.

    Ed…THX for your comment.

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