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.

Traps or air

I am servicing a low press steam system. I find alot of heat not working properly. Loaded with water is the biggest problem. After working on the traps and they are ok, they seem to stop heating again. There are no air vents on the cast heat. Is this the problem? Thanks.


  • Steamhead
    Steamhead Member Posts: 16,842
    This might be a Vapor system

    Have you located any manufacturer's info on the radiator valves or traps, or any odd-looking devices in the piping around the boiler? If so, this would help us identify it.

    The first thing to look for is- how does the air vent from the system? In most of these systems there is a centrally located air vent somewhere near the boiler, on the dry (overhead) return line. If this vent goes bad, the system won't heat well.

    Also look for radiator traps piped between the ends of the steam mains and the dry returns. These act as air vents for the steam mains. If one of these is leaking, it will let steam into the dry return and the system won't heat well- just as if you had a bad radiator trap somewhere.

    Take some pics and post them if you can.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
This discussion has been closed.