Bleeding your radiators allows the air that is trapped inside to be released. It is important that all the air in the pipework, radiators, and boiler be removed when your heating system is installed.
Air trapped in your heating system during its operation should be removed by periodically checking. Allowing air to be trapped in the system will result in poor performance and premature failure of components within your heating system. The use of a boiler additive is recommended on all steel panel systems.