What size pressure canner do you need?
The quart number on the box is not the number that matters. Jar capacity is, and there is a published floor below which a canner is not a canner.
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Size a pressure canner by jar capacity, not liquid quarts. The NCHFP notes small pressure canners hold four quart jars while large ones hold 18 pints in two layers but only seven quarts, and that pressure saucepans with smaller volume capacities are not recommended for canning. A seven-quart-jar canner suits most households.
Pressure canners are sold by liquid capacity — 16 quart, 21.5 quart, 23 quart — and that number tells you almost nothing useful. What you need to know is how many jars go in, whether pints can be double-stacked, and whether the base fits your stove. Those three answers do not track the headline figure in any consistent way.
There is also a floor, and it is a published one rather than a matter of taste. Below a certain capacity a pot is not a canner at all, however it is marketed.
The floor, first
The NCHFP is explicit that pressure saucepans with smaller volume capacities are not recommended for use in canning. This is the single most important sentence on this page, because the products that violate it are the ones most aggressively sold as canners — small stovetop pressure saucepans and electric multi-cookers with a canning preset.
The reason is heating behavior. A small canner heats and cools faster than the ones the processing times were developed on, so the total time the food spends at temperature does not match the tested process even when the gauge reading and the clock are both correct. That is a failure you cannot see, taste or smell, in the one food category where the consequence is botulism.
The number to size on: jar capacity
The NCHFP gives the shape of the range plainly: small pressure canners hold four quart jars, while some large pressure canners hold 18 pint jars in two layers but hold only seven quart jars. That last clause is the one that surprises people. A canner's pint capacity can be more than double its quart capacity, because pints can be stacked in two layers and quarts cannot.
| Canner | Quart jars | Pint jars | Notes |
|---|---|---|---|
| Presto 23-quart (01781) | 7 | 20 | Also 26 half-pints; doubles as a boiling water canner |
| Presto 16-quart (01745) | Pressure only | Weighted gauge | Not tall enough to water bath quarts, per Presto |
| All American 921 (21.5 qt) | 7 | 18 | Metal-to-metal seal, no gasket; 24 lb empty |
| All American 925 (25 qt) | 7 | 19 | Taller on the same base as the 921 |
| Small saucepan-style canners | Up to 4 | — | Below the NCHFP recommendation |
Note the 921 and 925 in that table. Twenty-five quarts against 21.5 buys you one extra pint of capacity, because the 925 is taller on the same base — the whole range is laid out in All American canner sizes compared. The larger model is covered in the All American 921 review. If you were expecting the bigger number to mean a bigger batch, it mostly does not.
Seven quart jars is the answer for most people
Seven quarts is not an arbitrary sweet spot. It is the batch size the tested NCHFP recipes are written around, which means a seven-quart canner is never processing a half load, and a half load is genuinely worth avoiding — it is the same 90 minutes of heat and attention for less food. The same logic on the water bath side is in what size water bath canner do you need.
It also handles the pint-heavy reality of most kitchens. Twenty pints in two layers covers a serious green bean day, and a household of two eats a pint more comfortably than a quart. If you buy one canner and never think about it again, buy one that takes seven quarts.
Quick picks
Every pick below is screened against the National Center for Home Food Preservation’s published canner rules first. Tap a row for the full write-up.
| # | Product | Best for | Key spec | Price |
|---|---|---|---|---|
| 1 |  Presto 23-Quart Pressure Canner and Cooker (01781)The default first pressure canner, and the one most beginners should buy: it takes a full seven-quart load, it doubles as a boiling-water canner for pints and half-pints, and it costs a fraction of a cast-aluminum canner. The dial gauge is the catch, and it is a real one. | A first pressure canner | 7 quarts / 20 pints | |
| 2 | All American 921 (21.5 qt)Cast aluminum with a machined metal-to-metal seal, so there is no gasket to perish, swell or go missing the week you need it. It is also 24 pounds empty and its base is wider than most electric elements, which is a genuine constraint rather than a footnote. | Buying once, for decades | Base 15 3/8", no gasket | Check price on Amazon#ad we earn a commission · live price pending |
| 3 | Presto 16-Quart Pressure Canner (01745)The weighted-gauge alternative: nothing to calibrate, ever, because the regulator rocks when the pressure is right. The trade is height. It is not tall enough to boiling-water can quart jars under the required inch of water, so it is a pints-and-half-pints canner. | Pints only, and a small kitchen | Weighted gauge, no calibration | Check price on Amazon#ad we earn a commission · live price pending |
| 4 | All American 925 (25 qt)The 921 made taller. It sits on the same base, so it fits — or does not fit — your stove exactly like the 921 does, and the extra capacity buys you a taller stack rather than a wider one. | Bigger batches, same footprint | 25 qt, same base as 921 | Check price on Amazon#ad we earn a commission · live price pending |
| 5 | Small pressure cookers and multi-cookers sold as cannersSkipSkip anything under the seven-quart-jar mark, and skip every electric multi-cooker with a canning button that is not specifically specified for pressure canning. The NCHFP is explicit: pressure saucepans with smaller volume capacities are not recommended for canning. | Nothing — skip these | Excluded by NCHFP | Check price on Amazon#ad we earn a commission · live price pending |
Presto 23-Quart Pressure Canner and Cooker (01781)
The default first pressure canner, and the one most beginners should buy: it takes a full seven-quart load, it doubles as a boiling-water canner for pints and half-pints, and it costs a fraction of a cast-aluminum canner. The dial gauge is the catch, and it is a real one.
Published specs
- Liquid capacity
- 23 quarts (21.8 liters)
- Jar capacity
- 26 half-pints, 20 pints, 7 quarts
- Material
- Warp-resistant aluminum
- Gauge
- Dial gauge
- Ranges
- Regular and smooth-top
- Burner limit
- 12,000 BTUs or less
- Also
- Doubles as a boiling-water canner
- Warranty
- 12-year limited
- Base diameter
- Not published by Presto
What works
- Seven quart jars is the standard batch size every tested NCHFP recipe is written around, so you are never processing a half load
- Doubles as a boiling-water canner for pints and half-pints, which means one pot covers the jam-and-pickles year as well as the beans
- Presto sells a replacement dial gauge and sealing ring separately, so a decade-old canner is a repair rather than a replacement
What to know first
- A dial gauge should be checked for accuracy every year — most extension offices do it free, and most owners never go. A weighted gauge needs no calibration at all
- Presto does not publish a base diameter, so you cannot check it against the NCHFP element rule without measuring the box yourself. See will it fit your stove
- Rated for burners of 12,000 BTUs or less, which rules out most outdoor propane burners and some high-output gas ranges
Specs from Presto, 23-Quart Pressure Canner and Cooker (01781). We have not handled this product — see how we pick.
All American 921 (21.5 qt)
Cast aluminum with a machined metal-to-metal seal, so there is no gasket to perish, swell or go missing the week you need it. It is also 24 pounds empty and its base is wider than most electric elements, which is a genuine constraint rather than a footnote.
Published specs
- Liquid capacity
- 21.5 quarts
- Jar capacity
- 18 pints or 7 quarts
- Seal
- Metal-to-metal, no gasket
- Gauge
- Geared steam gauge
- Regulator
- 5, 10 or 15 psi
- Inside diameter
- 12 1/4 inches
- Inside height
- 10 1/2 inches
- Bottom exterior diameter
- 15 3/8 inches
- Weight (empty)
- 24 pounds
What works
- No gasket means no annual replacement part, and nothing that hardens in a hot attic between seasons
- All American publishes the base diameter, which almost nobody in this category does — you can check it against your element before you buy
- The 921 and its siblings are the canners people hand down. Parts and gauges remain available for very old units
What to know first
- The 15 3/8" base needs an element of at least 11 3/8" to stay inside the NCHFP 4-inch rule, and most household electric elements are 6" to 9". Check your stove first
- 24 pounds empty, and considerably more loaded with jars and water — a real consideration if lifting is difficult
- Several times the price of a Presto, which is money better spent on jars and lids for a first season
Specs from All American, 921 21.5-Quart Pressure Canner, NCHFP, Recommended Canners. We have not handled this product — see how we pick.
Presto 16-Quart Pressure Canner (01745)
The weighted-gauge alternative: nothing to calibrate, ever, because the regulator rocks when the pressure is right. The trade is height. It is not tall enough to boiling-water can quart jars under the required inch of water, so it is a pints-and-half-pints canner.
Published specs
- Liquid capacity
- 16 quarts
- Regulator
- 3-piece weighted, 5 / 10 / 15 psi
- Material
- Aluminum
- Calibration
- None required
- Boiling-water use
- Pints and half-pints only — not tall enough for quarts
- Base diameter
- Not published by Presto
What works
- A weighted gauge never needs testing. It rocks when the pressure is correct, and that is the whole interface
- Smaller footprint and lighter than a 23-quart, which matters if you are canning on an apartment range or storing it in a closet
- The audible rocking is easier for a nervous first-timer to read than a needle you are trying to hold at exactly 11 psi
What to know first
- Cannot boiling-water can quart jars — Presto states it is not tall enough to cover them with the required 1 inch of water
- Smaller pressure-canning loads mean more batches on a heavy tomato or bean day
- Weighted gauges only do 5, 10 and 15 psi, so at altitude you round up to the next weight rather than dialing an exact number
Specs from Presto, 16-Quart Pressure Canner (01745), NCHFP, Recommended Canners. We have not handled this product — see how we pick.
All American 925 (25 qt)
The 921 made taller. It sits on the same base, so it fits — or does not fit — your stove exactly like the 921 does, and the extra capacity buys you a taller stack rather than a wider one.
Published specs
- Liquid capacity
- 25 quarts
- Seal
- Metal-to-metal, no gasket
- Regulator
- 5, 10 or 15 psi
- Bottom exterior diameter
- 15 3/8 inches, same as the 921
- Base model
- Same body diameter as the 921
What works
- Extra height without extra width, so it does not make your stove-fit problem any worse than the 921 already does
- Same gasket-free seal and same long parts availability as the rest of the range
- Worth the step up only if you are already canning enough to fill a 921 twice in a session
What to know first
- Same 15 3/8-inch base as the 921, so the same element-size problem applies in full
- Heavier again than the 921, and taller means more reach to lift a full rack out
- For a first harvest this is more canner than the job needs
Specs from All American, 921 21.5-Quart Pressure Canner, NCHFP, Recommended Canners. We have not handled this product — see how we pick.
Small pressure cookers and multi-cookers sold as canners
Skip anything under the seven-quart-jar mark, and skip every electric multi-cooker with a canning button that is not specifically specified for pressure canning. The NCHFP is explicit: pressure saucepans with smaller volume capacities are not recommended for canning.
Published specs
- NCHFP position
- "Pressure saucepans with smaller volume capacities are not recommended for use in canning"
- Required capacity
- Enough for seven quart jars or eight to nine pints
- Required approval
- UL approval
What works
- There is no upside worth listing. This entry exists so you can recognize the category and walk past it
What to know first
- Too small to hold heat the way tested processing times assume, so the times on a tested recipe do not transfer
- A "canning" preset on a multi-cooker is a marketing label, not a validation. Only appliances specified for pressure canning, like the Presto Precise, have been through that work
- This is the failure mode with the worst consequences in the whole category — under-processed low-acid food is where botulism comes from
Specs from NCHFP, Recommended Canners. We have not handled this product — see how we pick.
When to buy smaller
Two honest reasons, and neither is about capacity.
- Weight and handling. A loaded 23-quart canner is a two-handed lift you plan around, and the All American is 24 pounds before anything goes in it. If lifting is difficult, a smaller canner you will actually use beats a larger one you avoid.
- Storage. A 23-quart canner lives somewhere for eleven months of the year. Apartment kitchens have a real answer to this and it is sometimes 16 quarts.
What is not a good reason is 'I will only do small batches'. Batch size is decided by the harvest in front of you, and a bigger canner runs a small load perfectly well. The reverse is not true.
The constraint that overrides all of this
Your stove. The NCHFP's rule for electric ranges is that a canner should be no more than 4 inches wider in diameter than the element it sits on, and household elements are commonly 6 to 9 inches — which caps the canner at 10 to 13 inches regardless of what capacity you wanted. The All American 921's published base is 15 3/8 inches, and that number has ended more canner decisions than capacity ever has.
So do the stove arithmetic before the capacity arithmetic. Will it fit your stove does it with your element measurement, and if you are on induction the question is different again — see canning on an induction cooktop.
The decision, in one paragraph
Buy a canner that takes seven quart jars unless your stove or your back says otherwise, and check the element rule before you check anything else. Go smaller only for weight or storage, and understand you are trading the ability to water bath quarts if you go to 16 quarts. Do not go below the NCHFP's recommendation to save money or counter space — that is the one direction where the trade is safety rather than convenience. Best pressure canners has the specific models.
Next stepCheck the base against your elementCommon questions
What size pressure canner is best for a beginner?
Is a 16-quart pressure canner big enough?
Why does a 23-quart canner only hold 7 quart jars?
Can I use a small pressure cooker to can?
Is the All American 925 worth it over the 921?
Does a bigger canner take longer?
Do you earn a commission on these?
Sources
- NCHFP — Recommended Canners
- Presto — 23-Quart Pressure Canner (01781)
- All American — 921 Pressure Canner
- Penn State Extension — Buying a Pressure Canner
Product specifications are taken from each manufacturer’s own published page, cited on the product. We have not handled these products — how we pick.
