European here without education for a plumber, just barely scratched the profession for a few years.
Low water pressure occurs in bigger complexes with a pipe to small for the consumers. The water pressure in suburbans and cities comes directly from the local water station.
If you have issues with this, there are special armatures for low water pressure.
The cheapest improvement is replacing the water disperser with a current one.
Other then that, one could install a pump to improve the water pressure, but these things are expensive and have high maintainability costs due to pumping drinking water, not water in a heater pipe.
Well, you have the option to elaborate otherwise. Huge effort to normalize this survey.