How Do You Actually Pressure Can Vegetables?
Kitchen and home life · PROBLEM-FIRST
The University of Saskatchewan's own extension gardening site states plainly that pressure canning must be used for all low acid foods, meat, fish, poultry and all vegetables except tomatoes, while water-bath canning is reserved for high-acid foods such as fruit and foods whose acidity has been raised with vinegar, such as pickles. The reason is a real, checkable temperature difference: a pressure canner raises the boiling point of water from 100 degrees Celsius (212 degrees Fahrenheit) up to 116 degrees Celsius (240 degrees Fahrenheit), which the same source states is the minimum temperature necessary to destroy botulism spores and the only way to guarantee safe canning of low-acid foods. North Carolina State University Extension's own food-safety guidance explains the mechanism behind that requirement: low-acid vegetables sealed in a jar create an oxygen-free environment where Clostridium botulinum, a bacterium whose heat-resistant spores survive ordinary boiling, can grow and produce a deadly toxin, so only the higher heat a pressure canner reaches destroys those spores before the jar is sealed and stored at room temperature. The National Center for Home Food Preservation's own published guidance corroborates the same figure, describing a safe low-acid process running at 240 degrees Fahrenheit under pressure. North Dakota State University Extension's own published guide to using a pressure canner lays out the real mechanics: after loading filled jars onto the rack over 2 to 3 inches of hot water, the canner is vented by leaving the weight off, or the petcock open, and heating at the highest setting until steam flows steadily, then exhausting that steam for a full 10 minutes before placing the weight on or closing the petcock. Processing time starts only once the gauge shows the pressure has reached the level a tested recipe calls for, and that pressure is held steady afterward by regulating the heat underneath, not by touching the weight. When the process time ends, NDSU Extension's own guidance is to let the canner depressurize at room temperature on its own, never forcing it to cool, and to wait until the dial needle returns to zero before opening the lid. This page does not state a specific pressure, processing time, or headspace for any one vegetable, because those figures vary by the vegetable, jar size, and altitude, and only a tested, current recipe from a source like NCHFP or a provincial or state extension service gets that specific figure right for a specific batch.
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Presto 02152 Precise 17-Quart Digital Pressure Canner, Electric, Waterbath Capable, 10 Built-In Safety Features
price: not in record Price and availability change, so check the current listing on Amazon.ca.
- Capacity: 17-quart liquid capacity (16 liters), manufacturer-published checked 2026-09-04
- Power And Control: Electric, 120 volts AC, 1485 watts; an internal sensor automatically maintains the exact temperature required for safe canning, with no manual adjustment needed even at high altitude, manufacturer-published checked 2026-09-04
- Pot Material: Removable pot with a nonstick, PFAS-free coated surface, per the manufacturer's own current product page. This corrects the prior page's claim of stainless steel construction, which traced only to the word 'Stainless Steel' in the Amazon.ca listing title, not to gopresto.com's own material description checked 2026-09-04
- Versatility: Doubles as a boiling water canner for preserving fruits, jams, jellies, pickles, and salsa, manufacturer-published checked 2026-09-04
- Safety Features: Ten built-in safety features, including a cover-locking system and an alert symbol that indicates an incomplete canning process, manufacturer-published checked 2026-09-04
Specs sourced from the manufacturer's Amazon.ca listing.
ASIN B0DCDWGXCVPresto 01781 23-Quart Pressure Canner and Cooker
price: not in record Price and availability change, so check the current listing on Amazon.ca.
- Capacity: 23-quart liquid capacity (21.8 liters); holds 26 half-pints, 20 pints, or 7 quart jars, manufacturer-published checked 2026-09-04
- Material: Extra-strong, warp-resistant aluminum, suitable for regular and smooth-top ranges, household burners of 12,000 BTUs or less, manufacturer-published checked 2026-09-04
- Gauge Type: A dial gauge that automatically registers the complete range of processing pressures, plus an air vent and cover lock, manufacturer-published checked 2026-09-04
- Warranty: Extended 12-year limited warranty; includes a cooking and canning rack plus an instruction and recipe book, manufacturer-published checked 2026-09-04
Specs sourced from the manufacturer's Amazon.ca listing.
ASIN B0000BYCFUAll American 925 25-Quart Pressure Cooker/Canner
price: not in record Price and availability change, so check the current listing on Amazon.ca.
- Capacity: 25 quarts liquid; holds 18 pint jars or 7 quart jars, manufacturer-published checked 2026-09-04
- Material And Weight: Precision cast from heavy-duty aluminum; the manufacturer's own current product page states 25 pounds empty, increasing by roughly 20 to 30 pounds once filled with jars and water. This corrects the prior page's 45-pound empty-weight figure, which this session's direct fetch of the manufacturer's own page does not support checked 2026-09-04
- Sealing System: A precision-machined metal-to-metal seal the manufacturer states has no rubber gaskets to wear out, replace, or fail; the rim is lubricated per the manufacturer's own instructions instead, manufacturer-published checked 2026-09-04
- Model Line: Part of a stove-compatibility lineup naming models 910, 915, 921, 925, 930, and 941 on the manufacturer's own current product page; this page compares the 925 checked 2026-09-04
Specs sourced from the manufacturer's Amazon.ca listing.
ASIN B0002808YSEvery spec above is copied from the manufacturer's own published listing or spec sheet, with the date it was checked.
Who this isn't for
This is not for anyone canning high-acid foods like fruit, jam, jelly, or vinegar-pickled vegetables; those only need a water-bath canner, already compared on this site's own water-bath-canners page, and pressure canning them is unnecessary rather than unsafe. It also is not for anyone planning to skip a tested, current recipe for their exact vegetable, jar size, and altitude before canning; pressure, processing time, and headspace vary by all three, and a university-extension or USDA processing chart, not this page, is the authority on those specific figures. Living Websites has not tested any of the three canners named below.