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Getting 4gpm run residential baseboard heating air out of system

What’s the best way to get air out of 3/4” baseboard radiant heating system if it runs on a 4gpm recirculating pump? My understanding is that the velocity won’t be able to push the air out of the system on its own right? So I would need to install manual vents on each radiator right? What would be the best approach? Thanks in advance


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
    If piped right you should have no air.
    With baseboard, some properly placed components and you usually just purge it at the boiler.
    EBEBRATT-Ed Member Posts: 15,307
    Depends on your pipe size. If it's 3/4" and piped in a loop you shouldn't have an issue. If it's monoflow or something else you could have an issue. With a series loop you can bleed at each baseboard or at a purge valve. Once you get water moving 4gpm in 3/4 pipe will move any remaining air back to the boiler