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built in air purger on MI Peerless

If I choose this option which I,ve been told is recommended because it leaves an air space at that end of the boiler which can/will dry fire,does it eliminate the need for an air scoop in the supply side horz. pipe. System is ci rads all above boiler on 1st floor. In other words is this built in baffle suffcient to vent system air.


  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542

    I've done it that way a couple of times and have never been called back because of air.

    The boiler is the IDEAL air seperator/eliminator. It's teh one spot where the water is the hottest, under the least pressure and where air will come out of suspension fastest.

    Go for it.

  • mitch moore
    mitch moore Member Posts: 32
    piping option

    how about piping directly into a steel expansion tank.acceptable?
  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542
    So long as...

    you're pumping away from it (the expansion tank), pretty much anything is legal.

    Just watch your height and operating pressure issues, as usual...:-)

  • Larry (from OSHA)
    Larry (from OSHA) Member Posts: 716
    but what if

    you aren't pumping away? In my situation, my Weil Mclain HE series 2 boiler is configured as the mfr. specified with the pump on the return side. There is a 1/2" tap on the top of the boiler going to the steel tank. Currently, it's not working to good to move air into it. My heating contractor said that is because of the piping being done with 90's and pipes not being pitched up. He assures me that when he redoes it, it will be ok. I've thought about using a B&G EAS air eliminator on the supply and running a line to the tank, but what about this not pumping away situation. My heating guy is not an advocate of pumping away in all applications. Please give me some advice. Thanks.

  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542

    Dan's book named "Pumping Away" and give it to your plumber. If he "gets it", let him do the work. If he doesn't get it, get the book back and call someone else who does. If you can't find someone who does (happens on occasion), send them here and we'll convert them, and then they'll convert your system.

    Not doing it right is not right, and there's no right way to do it wrong:-)

    Done right, you'll never have to mess with bubbles in your system ever again. Ever.

  • Mijola
    Mijola Member Posts: 124

    "Not doing it right is not right, and there's no right way to do it wrong."

    Gary should add that one to his list.
This discussion has been closed.