I am trying to conect up some solar hot water panels "which were here when i moved in but dissconnected" through a vented hot water cylinder. Prob is the main storage cylinder is presently fed by mains water although the mains presure is regulated down around 1 bar. This regulator on the mains feed can be turned down even lower so can I reduce the presure on that regulator then have the flow pass through my vented cylinder "solar cylinder", pass on to the main cylinder but add a vent pipe to the main cylinder which is the way the main cylinder used to be set up?????