This is the question behind half of every beginner's ChatGPT session. The answer is not about preference. It is about pH, spores, and which tested recipe you are following.
The one rule that decides everything
Foods with a pH of 4.6 or lower are high-acid. Foods above 4.6 are low-acid. High-acid foods can be safely processed in boiling water. Low-acid foods need the higher heat of a pressure canner.
If you only remember one line: when in doubt, check the tested recipe's processing method and do not swap it.
Comparison table
| Water bath canning | Pressure canning | |
|---|---|---|
| Best for | Jams, jellies, pickles, fruit, acidified salsas, most tomato recipes | Plain vegetables, beans, soups, meat, poultry, seafood |
| Max temperature | 212°F (100°C) at sea level | 240°F+ (116°C+) at 10–15 PSI |
| Equipment | Large pot + rack (21+ qt) | Pressure canner with weighted regulator (10 & 15 PSI weights) and pressure read-out gauge |
| Typical batch time | 5–35 minutes processing | 20–100+ minutes at pressure |
| Beginner first project | Strawberry jam | Canned green beans (after water bath basics) |
| Botulism risk if misused | Low on high-acid recipes | High if low-acid food is water-bath processed |
Foods that need a pressure canner
- Plain vegetables (green beans, corn, carrots, mixed veg)
- Dried beans and chili with meat
- Meat, poultry, and seafood (including broth and stock)
- Some tomato products when pH is not acidified per a tested recipe
Foods safe in a water bath
- Jams, jellies, and fruit preserves
- Pickles and relishes with sufficient vinegar
- Acidified tomato salsa and sauce from tested recipes
- Chutneys and high-acid condiments (see recipe pH notes)
Can you start without a pressure canner?
Yes. Most beginners start with water bath canning on high-acid recipes. Our strawberry vanilla jam and garlic dill pickles are built for that first batch.
When you move to green beans, chicken stock, or plain tomatoes, you need a pressure canner. The Kitchen Affections 24-quart model holds seven quart jars per batch and is sized for USDA reference processing times.
Using the Kitchen Affections 24-qt canner
This canner is a weighted-regulator model. You choose pressure by placing the correct weight on the vent:
- 10 PSI weight at or below 1,000 ft elevation
- 15 PSI weight above 1,000 ft elevation
The pressure gauge shows when you have reached pressure. It is a read-out — not a dial you turn to a setting. There is no 11 PSI setting on this product.
Pressure canning in six steps
- Inspect the canner. Check the gasket, vent pipe, and overpressure plug. Add 2–3 inches of water per your manual.
- Load filled jars. Jars upright on the rack, not touching sides or each other.
- Vent steam 10 minutes. With the vent open, let a full column of steam escape before closing the vent and placing the weight.
- Bring to pressure. Place the 10 PSI weight at or below 1,000 ft, or the 15 PSI weight above 1,000 ft. Start timing when the weight rocks steadily.
- Process for the full time. Follow the tested recipe time at steady pressure. Do not change a dial number — swap weights for altitude.
- Cool naturally. Turn off heat and let pressure drop on its own. Do not force-cool. Check seals after 12–24 hours.
Ready for a tested low-acid batch? See our NCHFP-aligned canned green beans or browse the full NCHFP pressure canning index.
Common questions
Do I need a pressure canner to start canning at home?
No. Start with water bath canning on high-acid foods. Add a pressure canner when you are ready for low-acid foods like beans and stock.
Can I use an Instant Pot for canning?
Multi-cookers are not a substitute for a tested pressure canner unless the manufacturer explicitly certifies the model for home canning at USDA processing times. Use a dedicated pressure canner for low-acid foods.
What happens if I water-bath can green beans?
Green beans are low-acid. Water bath processing does not reach temperatures that destroy botulism spores. The jar may seal and look fine while still being unsafe. Always use a pressure canner and a tested low-acid recipe.
Sources: USDA Complete Guide to Home Canning (2024 revision); National Center for Home Food Preservation; Ball Blue Book (latest edition).