
But, do gas-oil tanks really exist? Although that may seem to be a gratuitous question, gas-oil heating systems in blocks of flats are, despite being in use since last century, or should I say, last millenium, very modern installations. Today, there are still buildings that have coal boilers or even no heating at all in areas where the climate makes it unnecessary.
That is the reason why the question in the title makes sense: in many resident's committees, people take their turn at being chairperson without realising that there is any more to the system than a "hole", to which a pipe is connected a few times a year and, through the wonders of science, the heating and hot water keep working. You cannot blame a mechanic, a dealer, or a lawyer for not knowing what we are talking about, because, probably, nobody has ever told them.
Consult applicable legislation