Water Bath Canning vs Pressure Canning: What’s the Difference?
If you’re new to canning and home food preservation, you may feel confused when one recipe says to use a water bath canner while another says to pressure can at 10 pounds of pressure for 55 minutes. Terms like botulism, acidity, pH levels, and safe canning methods can make beginners want to turn around and run the other direction.
Learning how to can can feel overwhelming, especially if you don’t have an experienced canner to call when you have questions. Many beginners second-guess every step they take and sometimes become nervous about eating the food they just preserved.
I was lucky because I had my mom to turn to whenever I needed help. I trusted her judgment completely. After all, all six of my siblings and I grew up eating canned garden produce every year, so she clearly knew what she was doing.
I wrote this post to help simplify the difference between water bath canning and pressure canning. I hope that you walk away understanding why these two canning methods exist and when each one should be used to safely preserve your garden harvest, farmers’ market produce, or homemade recipes.
So let’s get started…
And if you still feel confused while reading this post, feel free to email me. I’ll do my best to help you better understand these two canning methods.
What Is Water Bath Canning?
We’ll start with the easiest canning method and the one I usually recommend for beginners: water bath canning.
This method uses boiling water to process jars, sanitize the food, and create a safe vacuum seal. Water bath canning is simple to learn, but it can only be safely used for certain foods and recipes.
When water bath canning, you fill a large kettle with water and place a canning rack on the bottom. After filling your jars and adding the lids and rings, the jars are placed into the hot water. The water should cover the tops of the jars by at least 1 inch.
Once the water reaches a full boil, the jars are processed for the amount of time listed in the tested recipe. After processing, turn off the heat, let the jars rest for about 5–15 minutes, and then carefully remove them to a towel or cooling rack.
One thing I love about water bath canning is that you do not need fancy equipment. I’ve even used large stovetop-safe roaster pans before. As long as you have a deep pot and some type of rack on the bottom, you can safely water bath can.
However, water bath canning is only safe for foods that are naturally high in acid or sugar.
Examples include:
- jams
- jellies
- fruit syrups
- pickles
- relishes
- fruits packed in syrup
- tomato recipes with added acid
- chutneys
What Is Pressure Canning?
Pressure canning is more advanced than water bath canning and requires a pressure canner. While the equipment can feel intimidating at first, learning how to pressure can is one of the best food preservation skills you can develop, especially if you grow a large garden or raise your own food.
A pressure canner seals tightly and builds pressure inside the canner as it heats. That pressure allows the internal temperature of the jars to rise above boiling temperature to around 240°F.
This higher temperature is what destroys dangerous bacteria and botulism spores that can survive regular boiling water.
That is why pressure canning is required for low-acid foods such as:
- green beans
- corn
- carrots
- potatoes
- soups
- broths
- meats
Boiling water alone cannot reach high enough temperatures to safely preserve low-acid foods.
I know pressure canning scares a lot of beginners. Honestly, the internet has made it sound much scarier than it actually is. Once you understand the process and follow tested recipes, it becomes much easier and far less intimidating.
I also have several pressure-canning safety guides and beginner tutorials linked throughout this site that will help walk you through the process step by step.
Why Acidity Matters in Home Canning
When canners talk about “high-acid” and “low-acid” foods, they are referring to the acidity level, or pH, of the food being canned.
High-acid foods naturally prevent dangerous bacterial growth. Because of this, boiling water temperatures are enough to safely preserve them.
Low-acid foods are different. Since bacteria can grow more easily in those foods, they must be pressure-canned at higher temperatures.
Tomatoes are a good example. Even though tomatoes naturally contain acid, the acidity levels vary depending on the variety and ripeness. That’s why many tomato canning recipes require bottled lemon juice, citric acid, or vinegar to make them safe for water bath canning.
Other foods, such as pickles and pickled beets, are naturally high in acid because of the vinegar used in the recipe.
If a food is low in acid, it generally needs to be pressure-canned.
What Role Sugar and Syrups Play in Canning
Sugar also plays a major role in food preservation.
Fruits such as peaches, cherries, pears, and mandarin oranges are often canned in sugar syrup. Jams, jellies, applesauce, pie fillings, and fruit syrups can also be safely water bath canned because of their high sugar content.
Back when I worked heavily as a chocolatier, I learned a lot about shelf stability by experimenting with sugars, corn syrup, and glucose syrups in candy recipes.
That’s also why many shelf-stable foods contain large amounts of corn syrup or sugar. Sugar acts as a preservative and helps prevent spoilage.
Both acid and sugar create environments where harmful bacteria struggle to grow, which is why many high-acid and high-sugar recipes can safely be water bath canned.
Foods That Can Be Water Bath Canned
Here are some foods and recipes that are commonly safe for water bath canning:
- Jams
- Jellies
- Fruit butters
- Applesauce
- Fruit syrups
- Pie fillings
- Pickles
- Relishes
- Chutneys
- Acidic tomato products
Foods That Must Be Pressure Canned
These foods must be pressure canned because they are low in acid and do not contain enough sugar for safe water bath canning:
- Vegetables
- Meats
- Seafood
- Beans
- Soups
- Stocks
- Chili
- Unsweetened fruit juice
Common Beginner Canning Mistakes
Every canner makes mistakes when learning. That’s simply part of the process.
I’ve had jars siphon and lose liquid, lids fail to seal, mold grow around dirty jar rims, and lids warp during canning. I honestly think I’ve made just about every beginner canning mistake possible at some point.
Here are a few common mistakes beginners should avoid:
Which Canning Method Is Best for Beginners?
In my opinion, water bath canning is the best place to start.
When I taught my daughter how to preserve food, we started with simple jams and jellies. She ended up winning Grand and Reserve Champion ribbons at the North Dakota State Fair for her flavored jellies and jams.
If a 10-year-old can learn how to water bath can, anyone can.
Water bath canning helps beginners build confidence while learning basic food preservation skills and kitchen safety.
Once you feel comfortable with that method, move into pressure canning. I usually recommend starting with vegetables before trying more advanced recipes like soups or meats.
Pressure canning sounds scary at first because people love sharing horror stories online. In my 30+ years of pressure canning and over 55+ years for my mom, none of us have ever exploded a canner or gotten sick from properly canned food.
We use both methods regularly on our homestead and preserve a large amount of shelf-stable food every year for our pantry.
Do You Need Both a Water Bath Canner and a Pressure Canner?
If you are serious about preserving food long-term, I do recommend eventually owning both.
The good news is you do not need a fancy water bath canner. Any large stock pot or kettle deep enough to cover the jars with water will work.
For smaller jelly jars, even medium-sized pots work fine.
Pressure canning is different. You do need an actual pressure canner.
I personally use an older Presto pressure canner that doesn’t even have a dial gauge. It was inexpensive ($75), and while I have to adjust the burner temperature more often, it still works perfectly.
My mom owns a larger 23-quart Presto pressure canner ($150-235) that holds two layers of pint jars, which is incredibly helpful during the busy garden season.
They may not be the prettiest pressure canners on the market, but they get the job done.
One important thing beginners should know:
You cannot safely pressure can in a standard Instant Pot or electric pressure cooker.
There are new electric pressure canners specifically designed for water bath and pressure canning. Presto and Nesco both make a few different sizes.
They cost more upfront, but I see the appeal, especially for busy homesteaders preserving large amounts of food. I have been looking at buying one and testing it out.
Water Bath vs Pressure Canning
Hopefully, after reading this guide, you feel more confident about the difference between water bath canning and pressure canning.
At first, pressure canning can feel intimidating, but after a few batches, it starts to feel much more natural. There’s honestly something satisfying about pulling jars of homemade chicken broth or garden vegetables out of the canner and knowing you preserved that food yourself.
Start small, follow tested recipes, and build confidence one recipe at a time.
Before long, you may find yourself teaching someone else how to preserve their own garden harvest safely.
