Electric un-vented pressure vessel question!!

4 Jan 2020
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United Kingdom
Hi to all, i have an un-vented hot water only pressure vessel in my flat (no boiler) and there is no pressure in the expansion vessel. It has not been serviced in the 6 years i have lived here. There is no problems with it or relief valves dis-charging etc, but should there not be a certain amount of air in the expansion vessel? The make is a Range Tribune.

Thanks to all in advance! :)
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