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Copper fin vs. converted cast radiators

John_32
John_32 Member Posts: 3
in THE MAIN WALL
I have a 1950's house with the cast iron radiators with a monoflo loop system feeding them. I am replacing the boiler and was wondering if there is any reasons not to re-use the cast radiators. Which is a better choice with todays technology. Is there a formula to how much fin is needed to replace one cast iron? Can a run a little of both on the same loop? Can I get enough heated water through a finned radiator with a 1/2" loop? Thanks for the info

Comments

  • ed wallace
    ed wallace Member Posts: 1,613
    fin tube vs rads

    stay with the monflow loop and rads better heat that way and no you cant mix them on the same loop you cant feed baseboard using 1/2 copper pipes not enough btus will get to the fin tubes

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  • heatboy
    heatboy Member Posts: 1,468
    By all means...............

    keep the cast iron, but dump the mono-flow system. Use Wirsbo MultiCor (or equivalent, I guess) and run a supply and return line to each radiator. Bring them all back to a central manifold location. Easily zoned and each radiator is assured of getting the same water temperature. Add outdoor reset and TRVs for ultimate control.

    hb

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  • steve_26
    steve_26 Member Posts: 82
    constant circ.

    I would keep the monoflo system,pipe the boiler with a mixing valve W/oudoor reset and costant circulation.
    We do it this way all the time with CI Rads.

    Nice even heat.You can use the existing t-stat as high limit
    in the event there is a large gathering and internal load increase.

    Put the circ on a outdoor stat.

    Protect the boiler with proper piping design.
    It depends on the boiler you use.

    Steve
  • steve_26
    steve_26 Member Posts: 82
    DPB

    If you do use TRV's which is a very good choice.Make sure you pipe in a Diff.Press.bypass valve to protect the circ.

    steve
  • Boilerpro_3
    Boilerpro_3 Member Posts: 1,231
    Why dump the monoflow?

    I'd think just installing TRV's and outdoor reset would provide a real slick setup?

    Boilerpro
  • Dave Stroman
    Dave Stroman Member Posts: 766


    By all means, keep the old things. The next best heat to radiant floors.

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  • John_32
    John_32 Member Posts: 3
    TRV's ???

    I am a little confused - can I dump the monoflows, install tee"s instead and install the TRV's at each supply line to the radiator. I am not trying to get to complicated. I allready fabricated a seperate zone (w/monoflows)for upstairs. I also will have indirect dhw of this boiler. Thanks for the help
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