Ideally, you need a plumbed in regular water supply; of minimum 2 Bars ... maximum 4 Bars. Pressure regulating valves can be used to control the water pressure to a maximum of 4 Bars.
When ordering your espresso coffee machine, state that your electrical supply is either single or 3 phase. It makes a difference to the wiring of the coffee maker.
A word of advice ... rather get a coffee technician to install your machine and don't forget to order the correct installation kit which comes as an additional extra item when purchasing your coffee machine.
If less than 50 tables, then you need …
If more than 50 tables or high demand, then you need …
There are 4 GRP machines available for VERY high demand, as well as single GRP for minimal output.
The two common types of coffee makers in use are manual or automatic. Basically, the manual type lets you control the start and stop functions of dispensing your coffee and the automatic type is programmed to dispense what you want by simply pressing a button.
A single GRP which is either manual or automatic will be suitable.
If you live in South Africa, contact YO.