How to check pressure in the heating system?

The pressure in the system must be 1.2 bar 1.5 bar when the system is cold. Older models of Mikoterm boilers are equipped with mechanical Thermo-pressure meters, and new models have a digital display of pressure on the display. Therefore, older models can read the pressure without turning on the boiler, while new models need to be turned on in order to be able to check the pressure. Before turning on the boiler, turn off the room thermostat, then turn on the boiler via the main switch and read the pressure.