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Is this iron to copper transition OK? Main HW heating application.

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eclecticmn
eclecticmn Member Posts: 121
in Radiant Heating

Home owner near Minneapolis with cast iron radiators, one non working slant fin now ripped out, and hot water heat.
Mad Dog_2

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  • eclecticmn
    eclecticmn Member Posts: 121
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    What are the materials used for the reducer bushing and for the female sweat to MPT adapter? If this adapter is brass where can I get one? I can only find copper so far.
    Home owner near Minneapolis with cast iron radiators, one non working slant fin now ripped out, and hot water heat.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,634
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    The bushing would be black either CI or steel is fine. The adapter can be wrought copper or brass does not matter. Probably copper is going to be what's available.
  • WMno57
    WMno57 Member Posts: 1,349
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    No dissolved oxygen in the water in your hydronic space heating system. So mixed metals are OK. Mixing steel and copper can be a problem in domestic potable water systems (hot and cold), because there is dissolved oxygen in the water.
    I DIY.
    Mad Dog_2SuperTech
  • Project42day
    Project42day Member Posts: 6
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    Thanks. We just added a new boiler to our black steel piping and original radiators. We have the same question about mixing black steel and copper piping and possible risk of bimetallic corrosion. Do we need the contracter back to redo these pipe joints correctly? 1 image is recent joints x 4, black steel to copper in our new closed, hydronic heating system, 1 image shows earlier joins that included copper to brass bushing to black steel. Comments please





    Mad Dog_2
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,124
    edited October 2023
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    Closed systems can use both ferrous and nonferrous components. Your photos look fine @Project42day .

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    hot_rodSuperTechMikeAmann
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,113
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    Looks good..the man wipes his joints!  Not a slob...Mad Dog 🐕 
    Consulting by Mad Dog & Matt Jr.
  • SuperTech
    SuperTech Member Posts: 2,187
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    It's fine. No worries. 

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