Air bubbles in my forced hot water baseboard heating

Mike Chiasson

I have a two zone forced hot water baseboard heating system. I hear what sounds like air bubbles, or sane, running through zone 1, first floor, of my heating system. How do I purge the air our. There is a spigot below the valve, or one for each zone above the valve. Where should I connect the hose to drain the system? Or should I do something else?

tom_49

Shut off the power to the boiler, that way the valve will be closed. then attach the hose to the spigot above valve. open the valve slowly. you should hear water filling the boiler and should see air spitting out the hose.

Paul Pollets

Pumping Away...

If the circulator pump is installed correctly...pumping away from the expansion tank and CW feed, there will never be air in the system after the first purge. If you're pumping towards the expansion tank and CW feed, you'll always have air, even after purging.

See Dan's book "Pumping Away" available in the Online Store.

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steve_29

You first need to understand why you have air in the system.

If your air elimination devices are no longer working adding fresh water will only result in the same problem.

Make sure your air elimination devices aren't corroded or disabled.