A banjo cooker or jet burner running on propane works really well for heating the pressure canner.
After research for two days, I won't get a dehydrator or a pressure canner. I'm always considering a long term outage of power. I'll get a water bath canner and for any veggie that doesn't have enough acidity, I'll use the recipes I found at “National Center for Home Food Preservation” for pickling all veggies and using the water bath:
http://nchfp.uga.edu/how/veg_pick.html
I didn't know what a banjo cooker was...Wow, holds a 100 quart stockpot..Now, I want one.and they're not that expensive, either.