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Remove entrained, dissolved & free gases
What Are Entrained, Dissolved & Free Gases in the System?
Dissolved Gases
What they are:
Dissolved gases are gases (mainly oxygen and nitrogen) that are mixed into the water in molecular form. This happens when the water in the heating system is initially filled or topped up from the mains supply, where gases are already dissolved due to water treatment processes and atmospheric pressure.
Why they’re a problem:
When the heating system is turned on and water is heated, these dissolved gases come out of solution (just like bubbles forming when a fizzy drink is warmed). They then become entrained or free gases, contributing to corrosion, insulating the metal surfaces, and reducing heat transfer efficiency.
Entrained Gases
What they are:
Entrained gases are microscopic gas bubbles suspended or trapped within the circulating water. Unlike free gas pockets, they remain dispersed in the fluid rather than accumulating in one place.
Why they matter:
Although small, entrained bubbles have a massive impact over time:
They act as thermal insulators, reducing how efficiently heat transfers from water to radiators.
They circulate continuously, feeding corrosion throughout the system.
Over time, they coalesce into larger gas pockets (free gases).
Free Gases (Gas Pockets)
What they are:
Free gases refer to large, visible gas pockets that accumulate in high points of the system – often in radiators, pipes, or heat exchangers. These are the most obvious and disruptive form of trapped gas.
Why they’re dangerous:
Free gases block water flow and reduce radiator effectiveness.
They cause cold spots, gurgling noises, and uneven heating.
Worse, they foster internal corrosion and sludge formation (magnetite), leading to blockages and premature system failure.