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.


I have two onepipe steam boilers. One has the pressuretrol installed on the low water shutoff and the other has it installed on the top of the boiler. Everything I read says to install it on the low water shutoff. I asked a few heating guys and they say it doesn't matter. Who is right? and if it matters, why? Thanks


  • carol_3
    carol_3 Member Posts: 397

    The installation instructions say to always install the Pressuretrol above the water line, with a steam trap between the boiler and the controller. You can check out the details at customer.honeywell.com--go to the very bottom right corner, enter L404 in the bottom little white box. When the next page appears, select the second pdf, and go to page 5.
This discussion has been closed.