Heres a copy of the installation instructions
http://www.gledhill.net/pdf/StainlessLite%20Manual.pdf
On page 15 it shows the pipe config
I wouldnt put any heat in to the cylinder till the pipe work was corrected so yes it has to be at risk
The stop cock 7 needs to be removed
The...
Sorry achrn but i'd shut the hot water cylinder down as the pressure vessel is not correctly installed , it looks like its connected to the hot water outlet it shouldn't be , he,s either not g3 qualified or he cant read instructions lol
the pressure vessel must be connected to the combination...