How to Remove Air from a Heating System

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How to get air out of heating system is an important skill to have if you live in a home with a boiler system. As the system adds water there is a small amount of air that also leaks into the system. Over time this “air in boiler” creates pressure that no longer allows the water in the system to move freely. As the air pressure increases, the efficiency of your heating system decreases.

To remove air from a heating system you need time and patience in order to make sure that the job is done right. In a radiator system, each radiator will have its own bleeder valve. Make sure that you turn the heat off at least an hour before beginning to bleed the radiators. Once the bleeder valve is located, place a bowl below the valve and slowly open the valve a half turn. You should hear a hissing sound as the air escapes the system. When water begins to exit the system, close the valve, making sure not to over tighten. It is best to start on the top floor and work your way down from radiator to radiator.

With some systems it may be necessary to add water back into the system in order for it to work properly. Always refer to your owner’s manual to make sure that you know what your system’s requirements are. If you purchased a home with a boiler and do not have the owner’s manual, call a licensed professional to remove the air in the boiler system and re-pressurize the system.

Whether you hire a professional or do the job yourself, getting air out of your heating system is an important part of proper boiler maintenance. Always make sure to check all the bleeder valves in the system for leaks once the heat has been turned back on.