I have Just purchased a "Combination Direct Hot Water Cylinder " ( Not
Combi Boiler !) ...

I am not a plumber but think I can manage to connect a few pipes
myself... !

However I am baffled what all the 22mm holes are for and to which one
Is the actual Draw off one , Can any one tell me ?

On the one side top & bottom of the cylinder ,it has 2 x 22mm holes
adjacent,
On other side side top 22mm hole and bottom 15mm hole (Drain off point
)

Which of the other 3 option 22mm holes is the draw off point?? and
what are the other 2 for anyway ??

Also no hole for Ball valve in header tank Section of this Combi
Cylinder How far from the top should one drill the hole for the Ball
valve Fitting ?

Any help Appreciated

Thanks