Short answer no.
It could actually be quite dangerous to attempt!
The cylinder (being thermal store) would require a much larger expansion vessel than that of a normal combi type system.
The cylinder also may not handle being pressurised as it's design is that of an open vent type.
Basically, you would need to consider buying a sealed system thermal store cylinder such as an IMI tribune or similar, designed for the purpose, rather than try to adapt a possibly unsuitable cyclinder.
Carefree, July 2010
