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Air in system

Have a 3zone hot water system.I have blead off all the zones of air about a month ago and and every thing was running very quietly.Now I have air again in the system. This is an ongoing problem I have had for several years.Is there some type of air eliminator that can be installed in my system to take care off this problem?


  • Brad White_9
    Brad White_9 Member Posts: 2,440
    Some fundamentals

    1. Pump away from the expansion tank.
    2. Pump away from the expansion tank.
    3. Install a "microbubble resorber" type air eliminator. Scrub brush in a vessel. SpiroVent is one of the best known but Taco and others are getting into these also. Makes ginger ale go flat in one pass...
    4. Use a diaphragm type expansion tank. No air or gas sees the water.

    The above assumes you have purged the system of bulk air at start-up.

    In another thread, Mark Eatherton suggested an ounce of dish soap per 50 gallons of system volume to keep the air in suspension on the way to the air eliminator.
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