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cast iron system TD

Bill Nye_2
Bill Nye_2 Member Posts: 538
I don't know offhand. I'll just kick this to the top in case someone can help.


  • John Koll_2
    John Koll_2 Member Posts: 4
    cast iron system TD

    A client asked me which scenario is more efficient: their residential cast iron boiler and radiator system with it's 3-speed circulator set at low speed with a 27-28 F TD, or to increase the speed to achieve the typical 20 F TD. The circulator operates nearly continuously (off an aquastat on the supply pipe). THANK YOU, Wetheads!
  • A.J.
    A.J. Member Posts: 257
    circulator speed

    John,it sounds like you have a older boiler if you are working it off an aquasat that is working off tempeture.
    Wet rotor circulators use very little current and I wouldn't get lose any sleep over such a small differance.
    The closer you get to constant circulation with longer circulation cycles the better your system will preform
    from a comfort stand point.

    Kupetz's PLB & HTG
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