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Copper Finned or Cast Iron

Mike Z.
Mike Z. Member Posts: 23
What is the difference???


  • scrook_2
    scrook_2 Member Posts: 610
    one weights more?

    but seriously, the CI, being more massive (also more expensive), heats up slower and cools down slower, giving more even heat. You also won't get then ticking noises from expansion w/ CI.
  • Boilerpro_3
    Boilerpro_3 Member Posts: 1,231
    Done both

    Copper fin tube is more picky about flow and temps, however it is supposed to be much more resistnat to rapid changes in temp, as you get in baseboard systems and zoned systems. Cast iron is heavier and has more mass, but with many cast iron residential boilers only holding a gallon or two of water, the two are not as different as one thinks. Cast iron only holds about 1/10 the amount of heat as the equivalent weight of water.

    Also, copper tube boilers do not deal with lower temperature water well, in my experience, despite what the manufacturers say. You need 140 F returns for copper, and cast iron can go down to about 120F on many atmospheric gas boilers.

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