Cast Iron or Bronze Circulation Pump?

Discussion in 'HVAC Heating & Cooling' started by type@uwm.edu, Oct 21, 2008.

  1. type@uwm.edu

    type@uwm.edu New Member

    Messages:
    13
    Hi--
    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. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,263
    Location:
    Cave Creek, Arizona
    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. type@uwm.edu

    type@uwm.edu New Member

    Messages:
    13
    Thanks for your expertise! Rob D.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,324
    Location:
    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.
  5. Bill Arden

    Bill Arden Computer Programmer

    Messages:
    584
    Location:
    MN, USA
    If you used non-barrier PEX then you would need the bronze pump.
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