Listings show water bath canners made from stainless steel and enamel-over-steel (porcelain/enamel surface bonded to a steel core). Product descriptions often note the porcelain/enamel surface and steel core construction for heat distribution.
Many canners are described as compatible with gas, electric, and induction cooktops. Some product notes call out suitability specifically for gas and electric, while at least one listing warns against use on glass cooktops.
Features highlighted in listings include built-in temperature (or pressure) gauges on the lid and clear tempered glass lids that let you watch jars while they process, making it easier to time and monitor processing.
Common capacities shown in listings range from about 15.5 quarts up to 33 quarts. Typical pot diameters listed are roughly 11.2 to 13.8 inches, depending on the model.
Canning cookbooks typically cover the basics and step-by-step water bath methods, lists of foods suitable (and unsafe) for water bath processing, safety rules and measurement guidance, required equipment and supplies, and many tested recipes for jams, pickles, sauces, relishes, and similar high-acid foods.