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One-pipe from two-pipe system

Tommi68 Member Posts: 25
So, if a home owner with a problematic two-pipe system has added air vents to radiators, would it operate as one-pipe? It seems to work, but cause problems elsewhere. 
There is some remodelling and linear convectors are installed with no trap and the condensate pipe rises higher than the top of the rad. It has an air vent and still heats.  

Is this a common ‘fix’? Troubleshooting the whole system seems to not be a priority. 


  • jumper
    jumper Member Posts: 2,208
    Too common and doesn't fix.
  • Jamie Hall
    Jamie Hall Member Posts: 22,916
    Amazing how forgiving steam can be. Sometimes. But what you are describing is a bandaid, and may or may not give rise to other problems down the road.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Tommi68
    Tommi68 Member Posts: 25
    It is a terrible patch. It sort of works so they don’t want to change it. It has causes other issues.  
    Fixing the  system seems to be too much effort.  
  • KC_Jones
    KC_Jones Member Posts: 5,698
    I’m trying to understand what you are getting to.

    Are you the contractor?
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
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