I wanted to share a recent canning mishap. After making pear butter and putting it in 1/2 pint jars, I wanted to move on to quart sized jars. I bought a larger canning pot (21.5 Qt. size) to accommodate the larger jars and tried to bring the water to a boil. After almost 30 minutes, it still wasn't boiling and I realized something was wrong. I read the literature that came with the pot and it said "not suitable for glass top stoves"... YIKES! After a little more research, I learned that not only will the water not come to a full boil but the porcelain on the pot can actually melt on the stovetop. I guess I'll just have to use smaller jars with my regular cookware since that water came to a boil with no problem. This probably isn't news to the experienced canner, but I hope it helps others to avoid the same mistake. Here is the canner I bought:
Granite-Ware