Hi Remi,
Welcome to the Heartland Owners Forum and Family. We have a great bunch of people here with lots of information and all willing to help if needed.
You should have gotten an owners manual and a warranty card to fill out, which would have the information on it, or when you did your PDI and was given you paper work. If not you will need to take the lower trim off and should be able to see a tag or information sticker there.
Enjoy the forum and your new unit.
Jim M