How to Use an 8 Qt Pressure Cooker?

An 8 qt pressure cooker needs minimum liquid, a sealed lid, and a set pressure program before it can cook.

Whether you just unboxed an electric multicooker or inherited a stovetop model, the core routine is the same: add enough liquid, lock the lid, choose a pressure level, and wait for the pressure to release before you open it. The details differ between electric and stovetop units, and getting them right is the difference between tender pot roast and a frustrating, undercooked dinner.

This guide walks through the exact steps for both types, the fill limits that keep food safe, and the mistakes that cause the most failures.

Electric 8 Qt Models: The Step Order That Works

Electric pressure cookers like the Instant Pot handle pressure and heat automatically, so your job is mostly setup and timing.

• Place the inner pot in the base and add your liquid. For the 8 qt Instant Pot startup test, the manual specifies 3 cups (750 mL) of water.
• Fit the lid and make sure the sealing ring sits properly in the groove.
• Turn the steam release handle to Sealing. If it’s on venting, the pot will never build pressure.
• Press Pressure Cook (or the model’s pressure program), set the time, and start.
• When cooking finishes, release pressure using the method your manual allows before opening.

For a natural release on the Instant Pot Duo 8QT, leave the steam release handle on Sealing and wait until all pressure has dropped. Turning Keep Warm off speeds up that natural release slightly. A quick release uses the valve to vent steam fast, but check your manual first — some recipes and foamy foods call for natural release only.

Never try to force the lid open. The unit is designed to lock until internal pressure drops safely.

Stovetop 8 Qt Models: Manual Pressure Control

Stovetop cookers like the Presto 01370 and Viking 8 Qt give you direct control over heat, which means you manage the pressure yourself.

1. Add liquid as the recipe directs, and don’t overfill.
2. Close and lock the lid. Place the pressure regulator on the vent pipe, aligned with the pressure arrow.
3. Heat on high until the unit reaches pressure.
4. Reduce the heat to maintain a steady pressure — if steam hisses constantly, the heat is too high.
5. When the timer ends, turn off the burner and release pressure by the method your manual specifies.

Before every use, the Viking manual stresses checking that the pressure release valve, pressure indicator, and sealing gasket are clean and unobstructed. The pot itself must sit flat on the burner, and steam should always vent away from your hands and body.

Why Liquid and Fill Level Matter So Much

Pressure cookers turn liquid into steam, and steam creates the pressure that cooks food fast. Without enough liquid, the unit can’t pressurize — or worse, it runs dry. With too much food, the pot can’t circulate steam properly.

Minimum liquid varies by model. Instant Pot’s 8 qt manual uses 3 cups for its water test, while general guidance for 8 qt electric models often settles around 2 cups. Your specific manual’s number wins — check it before your first cook.

Fill limits are more consistent. Keep the pot about two-thirds full at most. Foods that foam or expand while cooking, like beans, rice, or pasta, belong at the half-full line. Overfilling is one of the most common causes of clogged valves and failed cooks.

If you’re still choosing, our roundup of the best 8 qt pressure cookers on the market breaks down the top electric and stovetop options side by side.

Pressure Release: Quick vs. Natural

The release method controls how food finishes cooking. A natural release lets pressure drop on its own, which continues cooking the food gently. A quick release vents steam immediately, stopping the cook fast.

Use natural release for large cuts of meat, beans, and dishes that foam — the official Instant Pot manual notes that for natural release, you leave the unit set to Sealing until all pressure is gone. Use quick release for tender vegetables and seafood that overcook in seconds. On the Instant Pot Duo 8QT, turning off Keep Warm makes natural release happen faster.

Whichever method you choose, the rule is the same: direct steam away from your face and hands, and never open the lid until the float valve drops and all pressure is released. Instant Pot’s official manual library has the exact-release instructions for your specific 8 qt model.