I have been told by the plumbers installing my new condensing combi system, to expect to have to bleed the rads. once per month ond restore running pressure to at least 1 bar using the filling loop, then remove the loop, refitting the blanking caps to prevent passing valves from trickle-feeding into the system, which would cause blow-off. If your anti-corrosion additive is up to strength, there should be less generation of hydrogen in the rads., by water/steel corrosion. Have it checked and fortified at your annual service.
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