I will heat up the topic for a moment and make a short report - maybe someone in a similar situation will be interested in it. A wave of severe frosts passed - I did the stress test. It is true that with my soul on my shoulder, but I left it without the stove turned on. Yesterday - after 4 days of frost within -8 ° -2 ° I got to my apartment and expected Armageddon inside. It turned out that during these frosts it was about 10-12 degrees Celsius, which is more or less the same as in the staircase. I turned on the stove and the heating turned on at about this temperature. Nevertheless, I prefer not to carry out the next such test in frosts -8 and sleep soundly. Now I have a bite if nothing breaks down and the gas will not evaporate somewhere, but I turned the valve on the stove, the candle turns on only when the pumps are turned on, gas inspection of the stove and installation done, so nothing should happen. I have to rent this apartment because the neighbors complain that they are cold, but the cramps of these tenants are hell sometimes you can get.
Anyway - it is indeed difficult to cool down an apartment in a block of flats, but it is probably at the expense of the neighbors. as I have an extreme apartment, the ground floor and I am practically not warmed up by anything except one wall in the room and the ceiling from above, I feel relieved of responsibility

Well, but if this apartment was somewhere in the east and there were frosts around -20 °, I wouldn't leave it without a stove. Probably, in these areas, such experiments should not be recommended - probably from the apartment on the first floor and we are not afraid of flooding our neighbors with water from the radiator. Suma sumarum - colleagues, you were right. Nothing happened, but the risk is always that one of the neighbors will leave and then in these frosts it will be close to zero inside.
I only have one question about this stove. I noticed - as I wrote earlier - that the candle is only turned on when the circuit is started - that is, when the stove starts to work, but I do not know if I am right and if there is anything else pulling the gas. I had little time to check, but from what I noticed there was silence on the meter. The stove is Wolf, but I don't remember the type. The point is whether there will be no gas from me by any other process. I left the temperature set to 5 ° so that in the event of an extraordinary case it would turn on and heat up, so the gas meter should theoretically not show anything more than what it was when I left the apartment. The previous stove was able to stretch the candle 1m a day, but it did not turn on the circuit itself in a similar situation during the winter - so many frosts have never happened.
Oh - one more thing. This is how I saw the central heating installation and it is probably impossible to drain all the water from the radiators there. There is a ball valve at the bottom of the radiator in the bathroom - the closest radiator to the boiler - and that's it. when the water is drained through this valve, the water probably only drains from the stove and from this bathroom radiator. I did not notice any valves in the other radiators. I imagined that the bathroom is at the lowest level and the entire content of the system should flow from it, but maybe I did something wrong and maybe a dozen liters of water fell to 4 radiators and a boiler, so I did something wrong myself, or something wrong with the installation.