My Giotto is plumbed in and I used (as recommended by the supplier) an adjustable pressure reduction valve(about £25) and a water filter (standard 10 inch filter with a scale/particle filter cartridge).
It's a joy not having to fill it up, particularly being an hx machine that you need to run lots of water through to normalise the temperature if you haven't pulled a shot for a while.
Gracias. Shall have a look around to see what machines can fit in. I want something to tinker with for the main part, but also something that can serve four people a healthy dose at once.