Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Swing check instead of a Hartford loop.

We received a call today with a leaking 1-1/2" return line on an HB Smith G210 112,000 input one pipe Steam boiler. Upon arrival we noticed that there is no loop of any kind. The return is piped in directly with a swing check installed. Would you recommend Installing the old Hartford of a Gifford? Or leave it as is and just replace the leaking return nipple with a new check?


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
    I wouldn't recommend a swing check. Could easily get crud in there and stay open.
  • Danny Scully
    Danny Scully Member Posts: 1,415
    First there was no loop, then there were swing checks, then the Hartford. I’d go Hartford.
    EBEBRATT-Ed Member Posts: 15,307
    Depends on the boilers age and when it will need to be replaced. Why pipe a Hartford now if the boiler will be replaced in a few years then the Hartford will need to be done again? Use a check valve. If the boiler will remain for a while pipe the Hartford
  • mikeg2015
    mikeg2015 Member Posts: 1,194
    One one pipe with a dry return, a
    Hartford loop serves little
    Purpose other than creating a mud leg to trap sediment. Uninstalled one anyway on my boiler mainly for that purpose.