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.

Hartford loop

Steamhead
Steamhead Member Posts: 16,718
The purpose of the Loop is to keep water from backing out of the boiler if the return line should break. You'll see many older boilers that don't have them, these were likely installed before Loops came into general use. You will also find newer ones installed without Loops by installers who don't know what they're doing (Read The Freakin' Manual!).

The Loop consists of an equalizing pipe from the end of the steam header to the return tapping, and the return main connecting to this equalizer thru a short nipple slightly below the level of the bottom sight glass tapping.

If you haven't already, get a copy of Dan's book "The Lost Art of Steam Heating" which devotes an entire chapter to the Hartford Loop. Order yours on the Books and More page of this site.
All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting

Comments

  • Hartford Loops

    Are Hartford Loops essential for a proper steam boiler installation? What is its purpose, and how would I recognize them in the field?


  • Thanks Steamhead,

    Could lack of a Hartford Loop result in wet steam being delivered to the ssytem, or perhaps irratic pressure at the boiler????
  • Steamhead
    Steamhead Member Posts: 16,718
    No, but

    the lack of a proper header would do that.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
This discussion has been closed.