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hartford loop height

install manual says 2" below normal water line.


is that 2" to the top of the close nipple, or to the center of the nipple?  i guess the lower the better to avoid hammer, correct?


beautiful Conshohocken PA


  • Dave in QCA
    Dave in QCA Member Posts: 1,785
    From Top of close nipple

    I just did some reading to see what the manufacturers say about it.  Burnham v9 instructions simply say 2-4" from the normal water line.  Weil-McLain for the 80 series say 4" from the normal water line to the top of the close nipple connection of the Hartford loop.

    So, I would go with a measurement from the top, just to be safe.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
  • SWEI
    SWEI Member Posts: 7,356

    or Gifford?  I've read Henry's articles on it, but am curious if others here have direct experience with using a Gifford Loop.
This discussion has been closed.