When the problem didn’t go away I realized something was wrong with the water in my apartment.
There was low pressure, and the boiler was giving almost no hot water.
I contacted repair services, but everyone gave different explanations — pipes.
I decided to разобраться it myself. That’s how I found this website: https://stroyka2001.kh.ua
There they clearly explain causes of low pressure.
After reading a few articles, I understood what had been overlooked.
I can suggest this resource to anyone who wants to save money on repairs.