Hello, I have a stove like in the picture of the Vaillant brand in a rented apartment - I do not know the model (maybe someone will recognize it), hence my question which of the valves (1, 2 or 3?) Can be used to top up water in the heating circuit? Can it be done when the stove is on or do you have to put it off?
Regards and thank you for the answers.
Tomek
Regards and thank you for the answers.
Tomek


