Pressure Canner vs. Pressure Cooker: What's the Real Difference?

Shop listings use these two words as if they meant the same thing, so it's fair to find this confusing. The difference comes down to a few things you can check yourself.

What's the short answer?

If you want to can low-acid foods (vegetables, meat, chicken, fish) with USDA instructions, you need a pressure canner. If you want quick stews, a cooker is fine, and it can stay your cooker. If you'd like one big pot for both, some stovetop canners are sold that way.

How do they compare?

A pressure canner:

• Holds four quart jars upright, lid on. That's the test, says Penn State.
• Lets air out before pressurizing. The USDA says all types must.
• Shows it holds pressure, with a dial or weighted gauge.
• Has USDA instructions behind it.
• Main job: canning, sometimes cooking too.

A small stovetop cooker or saucepan:

• Doesn't hold four quart jars, in the sizes the National Center for Home Food Preservation describes.
• Has no USDA instructions behind it.
• Main job: cooking.

An electric multi-cooker:

• May or may not fit four quart jars, and that's not enough by itself.
• The National Center says air left in the steam lowers the temperature. Penn State says cookers don't hold steady temperatures.
• Has no USDA instructions behind it. The National Center does not support them here.
• Main job: cooking.

Why does each difference matter?

Size is more than fitting jars

The USDA says small pressure saucepans are not recommended for canning. The National Center explains why. Small cookers have less metal, a smaller diameter and less water, so they come up to pressure and cool down faster. That cuts the total heat the food gets. Under-heated low-acid food can cause botulism.

Quart numbers add to the confusion. A "4-quart" cooker is not a canner that holds four quart jars. Our page on the 4-quart question sorts that out.

Letting the air out

The USDA says all pressure canners must have the air let out before they're pressurized, because trapped air lowers the temperature at a given pressure. A pot that simply builds pressure hasn't necessarily reached the right heat. The National Center says the same about multi-cookers. A pressure reading doesn't prove the food heated through the way it did in the canner used to make the process.

A gauge you can trust

Penn State lists a pressure gauge as part of the test, either a dial or a weighted gauge. It lets you confirm the canner stays at the right pressure the whole time. It also says pressure cookers don't hold steady temperatures and lack pressure canner safety features. Our dial and weighted gauge comparison covers the two types.

What the USDA instructions cover

This matters most. USDA process times were not worked out for every pot that builds pressure. The National Center says its instructions were written for stovetop pressure canners that hold four or more quart jars upright. It adds that those times can't simply be converted for other equipment.

What about the in-between machines?

Three plug-in types get tangled up with this question, so we keep them apart.

• Electric multi-cookers. The National Center does not support USDA canning instructions in them, even with canning buttons. The CDC says not to use them for canning low-acid food. Our Instant Pot page has the full story.
• Cooker-canner combos. Penn State says these can't be recommended because research on their safety is missing. It names no brand. Putting the NESCO NPC-9 in that group is our own reading.
• Plug-in canners made just for canning. The Presto Precise is sold for canning only, and Presto says it's not for cooking. Nobody outside the company has published test results for it, and the experts' opinions differ. See are electric pressure canners safe.

These are different types. A statement about one doesn't carry over to the others.

Should you take a canner or keep the cooker?

Take a pressure canner if you want beans, carrots, meat or stock on the shelf, or you want to follow USDA instructions as written.

Keep your cooker if you want it for meals. Nothing here says it's a poor cooker. It's just a different tool.

Look for a pot sold as both if you want one piece of equipment for both jobs and have room to store it.

Our pick for stovetopAd

Presto

Presto 23-Quart Stovetop (01781)

A pot for your stove, the kind the USDA's canning steps were written for.

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Type

Stovetop pressure canner with dial gauge

Pressure canning

Yes

Water bath

Yes, quarts and smaller, per Presto

Liquid capacity

23 quarts

Jars per load

7 quarts, or 20 regular-mouth pints stacked

Altitude

You raise the pressure by altitude from the USDA tables. Water bath times also change with altitude.

Price class

Mid-range

Stated in: Presto Canner Comparison Guide (2025), read 2 November 2026

Why here: It is sold as both a pressure canner and a cooker, and Presto says it holds 7 quart jars. It is the stovetop type that the National Center says its instructions were written for.

Best for: You want to pressure can low-acid foods (vegetables, meat, chicken, fish) and can stay near the stove.

• The National Center's advice was written for stovetop canners
• Seven quart jars, or up to 20 regular-mouth pints stacked, says Presto
• Also works as a water bath canner for quarts and smaller, says Presto
• Works on gas and on electric coil and smooth-top ranges, says Presto

• You watch the gauge and adjust the heat yourself
• The dial gauge needs an accuracy test every year, says Presto
• Presto does not list induction for this pot. The 01784 is its induction version

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Our page on what a pressure canner is explains the parts, and our stovetop canner guide compares other pots. Asking this before you buy saves a lot of trouble later.