Pump can be in side the house. But if can't you need to run the cable from inside to the pump outside. Usually socket is not required, cause the on/off switch are from inside the house.

yes it will

Zean
Can we reduce the pump pressure for the Grundfos pump? I cant remember which model I have, but it is the one without the tank...

Actually Grundfos do have a model that can control pressure. It is called Grundfos UNI E series.
This pump is like a mini system pump, it has a control panel that will adjust the water pressure level according to the preset level. Originally it is set to run at 2.5bar but you can adjust it to 2 - 3.5bar.

How this pump works?
The control panel controls the speed of the pump, if one person turns on the tap, it will run slowly, when another person turns on the tap, the pump will operates faster. Therefore, you will have constant pressure all the time.

A normal pump like the CH models will operate at maximum speed when someone turns on the tap, when another person turns on the tap, the pressure will drop a little.

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We use Grundfos and find it quite good. Get the medium one is enough. If you get one too powerful and the internal water pipe in the walls are not made of copper, there's chance that the plastic may burst.