High Pressure solar geysers
A high pressure solar geyser is designed for on grid water supply (municipality). Anything over 200kpa is considered high pressure, however 400kpa is ideally what you would want to running your hot water pressure at. The water pressure at the hot water tap will be the same as the pressure from your cold water tap, provided the pipes are of equal diameter.
Closed Coupled solar geysers
It can get quite confusing when trying to figure out what solar geyser to go with. Closed coupled systems are probably the most effective systems as they have less chance of heat loss because there is less pipe travel till it reaches the tank through the thermosiphon method. Another way to remember closed coupled is that it is 1 peace. The pipes slot into the tank utilizing a silicone sleeve to seal it.