Gas heater Grunder black PO-E03

New, just looked at it and it turned out to be unnecessary. Packed in a box like from the store. There was a plan to take it to the countryside, but mom decided not to go in the cold. Bought a year or 1.5 years ago, it has been in the apartment all the time. I can't find the receipt, if really needed, I can try to request a copy at the store.