Low water pressure can be a problem at peak-water-usage times in some apartment and tenement flats but there may some methods you can use to raise water pressure.
In most houses, a combi boiler operates without any issues because it is fed directly by mains water from the road outside the home and, therefore, receives mains pressure.
If you do suffer from low water pressure in your house because you are located on a hill, for instance, you may be able to install a main booster pump or create a break tank to improve pressure.