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I've looked into this too; I've got a turkey fryer burner, but I'd like to keep the canning indoors if I can - kinda partial to my air conditioning during the time of year when we're canning most things.
I haven't pulled the trigger on it yet, but I think I'm going to spring for one of
these commercial units before next year's season. I'm guessing they're built a little better than the consumer-type hot plates, which should help them better handle a heavy canner.
We would do our canning outside even if we had AC. We do hundreds of quarts a year, and I would not want to have to pay to remove all that extra heat.
We don't do quite that much, probably a little over a hundred quarts a year. There's no arguing that for every BTU you pump into the house, you'll pay for the AC to pump it back out, but you can say the same for cooking a lasagna for 45 minutes in the oven, or frying up a big breakfast with a couple of stove burners on high for 30-40 minutes. Unless we did ALL the prep work (cleaning, cutting, simmering sauce, boiling jars, etc.) outside, we'd probably lose as much AC by opening and closing the door running back and forth as we do by running the canner inside. And doing all the prep outdoors isn't practical for us... we don't have a screened-in area to work, so flies, cats and free-ranging chickens would all be there trying to "help".
Not saying that outdoor canning is a bad idea though. Just that it depends on the situation. I like shuckin', sorting and cutting corn off the cob in the AC a lot better... enough to fork over a couple of extra bucks for the convenience and comfort.