difference between seald & fully sealed sch system

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Buckinghamshire
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My CH syestem is:

Potterton Kingfisher M F 60 boiler, with an “OSO” Unvented Water heater, Indirect 250 & new header tank, all installed in the garage.

I have to change the rads & distribution to them by drop down pipes.

Two plumbers said it will need to change the pressure vessel to make it fully sealed (or pressurized ??) system.

Another two chaps said it is alright as it is.

Does it really need to be changed, why & what is the difference between the two systems.

Thanx nick
 
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You don’t need a pressure vessel to make it sealed, you need one IF you make it sealed. Infinitely better than open vent.
It works better, almost completely gets rid of airlocks, and is much better to avoid corrosion.
Open vent is sooooooo outdated.
 

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