Well, I’m not completely sure the science of it..I just purchased a pressure canner and that was the warnings on directions...
>>>Well, I’m not completely sure the science of it..I just purchased a pressure canner and that was the warnings on directions...<<<
There are two basic reasons not to use water bath canners/pressure canners on glass top stoves...
1. Weight - a full canner can be 40 pounds - risking cracking of the stovetop.
2. BUT, main reason is that the base of those canners is much larger than the heat circles on the cooktop. This causes intense heat to be applied to a large outside the designed area which can cause the stove to fail.
OK, it can be done, but you need to use a smaller canner to avoid problems - lots and lots will post that they have done it for years, just like I have carried over a ton in a half ton pick-up. Sooner rather than later though you gonna have troubles...