The National Center for Home Food Preservation recently released a position paper on the use of so called “Multi-Use” electric pressure cookers that also claim they can be used as pressure canners … and they came in on the same side I was expecting them on:
Burning Issue: Canning in Electric Multi-Cookers
Should I can in my electric multi-cooker appliance?
Even if there are instructions for pressure canning in the manufacturer’s directions, we do not support the use of the USDA canning processes in the electric, multi-cooker appliances now containing “canning” or “steam canning” buttons on their front panels. Our pressure process directions have not been developed for that type of appliance, and the canner being used does matter. Our recommendations were determined for stovetop pressure canners which hold four or more quart-size jars standing upright.
You can read the rest of their statement here: http://nchfp.uga.edu/publications/nchfp/factsheets/electric_cookers.html