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iron to copper

C.Hall Member Posts: 2
Is there a rule of thumb to determine where to make the switch from threaded iron to sweated copper lines when piping out from a new, in my case Tarm, woodboiler? Simply cost of materials? Or some technical advantage?


  • Uni R
    Uni R Member Posts: 663
    Like they say with bicycle frames...

    Steel is real! The threaded iron piping is better at handling the expansion/contraction cycles over the long haul. Copper can look nicer and be easier to cut and connect. The price factor depends on too many variables to say.
  • hr
    hr Member Posts: 6,106
    On some

    boilers the jacketing prevents you from getting a wrench on a copper adapter right at the boiler tap. In this case a snort, or short, steel nipple with a copper FIP adapter screwed on works fine.

    It's nice to se a boiler piped in all threaded black pipe. A professionally piped iron job is a sight to behold! Swing ells allow you to straighten up boiler taps that are crooked, and allows expansion movement.

    Copper seems to be more common for hydronic systems, these days. A bit easier to work, in large sizes, if you don't have a pipe machine setup. Also easier to add additional tees down the road. Especially if you own a T-Drill :)

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