Converting a vented system to sealed

If your installer is certain that the air entrainment is not due to a leak some where, where does he think the air is coming from?

If it is a leak, a sealed system is not the way to go without finding it.

If it's the open vent/ height of tank / blocked air separator, cold feed / pump speed too high, why not just identify which, and solve the issue.

Sealing the system may cause you more problems.
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Ok, I would like not to have to go down the sealed system route if I can modify my system as suggested earlier to the combined feed vent type.
This has the advantage of costing me very few £££ to do and hopefully eliminating all the air too.
Personally, I would check what I have mentioned and if they where not the issues, i would cut out the air separator and change to a combined as per your diagram. They can often be blocked with crud

You havnt answered any of my questions and without seeing the system I can't really give you sound advice, your installer must have given you an inkling as to what he thought the problem might be.
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I have been too busy to do anything more about this recently, however, last5 evening while bleeding the radiators I decided to take a match with me.
When I held the match against the bleed valve while bleeding I was getting popping noises and sometimes a flame.
This says to me that there is hydrogen present in the radiators.
Now if my understanding is correct hydrogen is produced when the radiators corrode internally.
The last time I drained the system I added inhibitor.
The question now is, is there anything I can do myself to stop the hydrogen being formed?

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