Honestly, if you have to set up gas or buy gas, these are only Polish systems, you will buy BRC, you will complain if it does not work and the chakra will bill you for 1500 and it will still not work, for this cylinder is approved for 10 years, so to be honest, I would prefer myself assume than buy with. There is also the other side of the coin, Polish gasmen are mostly bunglers looking at it to earn money quickly, so you will also have to go if you get it wrong. Only proven workshops recommended on the forum, preferably partner workshops, so that you would not be left on the ice.
Regards