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A SpiroVent deaerator should always be installed at the hottest point within a system. In the case of a heating system, for example, this is the point where thewater exits the boiler. In the case of acooling system, it is in the return beforethe chiller unit. When installed in thecorrect location a SpiroVent has thecapability to deaerate the entire system asit can make the water absorptive.