They are easier to fill since air is expelled under pressure when bleeding the radiators.
There can be no problems that stem from a number of installation faults occurring on open systems that end up drawing air into the system causing air locks, corrosion and sludge.
The increased pressure raises the boiling point of water in the boiler. In an older boiler hot-spots cause localised boiling that often make kettle-like noises or even loud clanks or bangs.
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