Thanks piratesmate for looking into this for me. I only can about 2dz jars of tomatoes and about the same of jam every other year, just enough for my small family but I do make tons of applesauce and corn that I freeze. That requires large pots (at a minimum 2 dutch ovens going at once). I think I can use a large stock pot with a flat bottom to boil the jars to seal them but I doubt I can fit two dutchovens on top at the same time.
I agree with you, I wouldn,t trust the microwave method. My friend does hers in the oven and I have read that is unreliable also. Lets just say I avoid eating dishes that I know she used her canned products as an ingredient.