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Thread: Cast Iron or Bronze Circulation Pump?

  1. #1

    Default Cast Iron or Bronze Circulation Pump?

    I'm advising my plumber re pump model choice for water circulation in a closed-loop system for radiant floor heating using a masonry heater. We're looking at the Taco 007 series. One pump will used for the storage tank- heater loop (copper pipe, ~7gpm) and two pumps will be used for the upper and lower floor radiant heating loops. All are closed systems. My water has some iron content. The efficiency of the two pumps looks very similar. Is there an advantage with using a bronze or cast iron pump like longevity or ease of repair? Thanks for your suggestions! Rob

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default pump

    Normally there is no reason to use a bronze pump in a closed heating system because a cast iron one is not subject to corrosion.

  3. #3


    Thanks for your expertise! Rob D.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    A bronze pump would be required where potable water was involved. In a properly maintained closed heating system, fairly quickly all of the free oxygen is purged from the system so the cast iron pump is fine - no oxygen, no rust. If you have leaks and are constantly adding water, it can be a problem.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    Computer Programmer Bill Arden's Avatar
    Join Date
    Sep 2006
    MN, USA


    Quote Originally Posted by type@uwm.edu View Post
    floor radiant heating loops.
    If you used non-barrier PEX then you would need the bronze pump.
    Important note Ė I donít know man made laws, just laws of physics
    Disclaimer: I'm a big fan of Darwin awards.


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