I have been canning for 20 years, I have had this canner system for 15 and I will not ever go back to boiling water bath canning ever again. This canner is not meant to replace a pressure canner for low acid foods. It is a shallow pan with a rack and a large lid. The shallow pan is filled with water and boiled, the rack fits over the boiling water and the jars are put on the rack (7 quarts at a time). When the water boils, it creates steam- steam is at least 212 degree water- steam can actually get hotter than boiling water. When the steam is at a certain level (in the instructions) you begin timing your jars. The reason that this is so easy is that it doesn't take 20 minutes after you put your jars into the rack just to come back to a boil, thus saving a lot of time. I highly recommend this product. I just made salsa and it took me 30 minutes for 14 jars- In a traditional pot it would have taken at least 2 hours. That is the difference!