Our pick
Instant Pot Duo 5.7L multi-cooker
Why we picked it
- Pressure cooks and slow cooks in one pot
- 5.7 litres feeds a family or a batch for the freezer
- Sauté function means browning without another pan
Worth knowing
- Pressure cooking has a learning curve and a release step
- It’s bulky on a small worktop
Paid link
Sunday’s shopping is in the fridge, Thursday will be chaos as usual, and you’re wondering which gadget would actually make the week easier. The honest answer depends less on the gadget and more on how you cook.
Three questions first
- When do you have time? In the morning, or only at 6pm when everyone’s hungry?
- What do you cook most? Stews, curries and pulled meat, or chips, chicken and crispy things?
- How many are you feeding? Two, four, or a freezer full of portions?
What each one is actually for
| Slow cooker | Pressure cooker | Air fryer | |
|---|---|---|---|
| Best at | Stews, curries, tough cuts | Stews and beans in a fraction of the time | Crispy food, reheating, small portions |
| Time | 6 to 8 hours, unattended | Under an hour for most stews | 15 to 30 minutes |
| Suits | People who prep in the morning | The 6pm scramble | Small households, quick meals |
| Texture | Soft and tender | Soft and tender | Crisp and browned |

What each one does badly
- Slow cooker: anything you want crisp. Dairy, fresh herbs and pasta also suffer if they go in at the start, so add them in the last half hour.
- Pressure cooker: delicate fish and green vegetables overcook in seconds, and you can’t taste and adjust halfway through without releasing the pressure.
- Air fryer: wet batters drip through the basket, and big batches have to be cooked in rounds.
Sizing it to your household
| Household | Slow cooker | Pressure or multi-cooker |
|---|---|---|
| One or two | About 3.5L | 3L to 5.7L |
| Three or four | 3.5L to 5L | 5.7L |
| Batch cooking for the freezer | 6L or more | 6L or more |
Remember that a slow cooker works best between half and two-thirds full, and a pressure cooker must never be filled past its maximum line. Buying slightly bigger than you think gives you room for a batch.
A note on batch cooking
If you cook once and eat three times, the big pot matters more than the method. Cool food quickly, portion it into freezer bags and label them. Reheat thoroughly until piping hot all the way through.
Running costs
All three use far less energy than heating a full oven for a small meal. A slow cooker runs at low power for a long time, a pressure cooker at higher power for much less time. The Energy Saving Trust compares cooking appliances and finds the small ones generally cheaper than the oven for the same meal. For the air fryer maths, see when an air fryer actually beats the oven.
Matching the cooker to the household

The morning prepper
If you can spend ten minutes before work, a slow cooker is the calmest option. It’s cheap, simple, and dinner is ready when you walk in.
Slow cooker
Crock-Pot digital slow cooker (3.5L)
Best for: three or four portions with a countdown timer that switches to keep-warm.
Think twice if: you batch cook for the freezer; go bigger.
Paid link
The 6pm scramble
If you only start thinking about dinner when you get home, a pressure cooker turns a three-hour stew into a weeknight meal. A multi-cooker like our pick does slow cooking too, so you don’t need both.
Want crispy as well as stews?
All-in-one
Ninja Foodi MAX multi-cooker (7.5L)
Best for: pressure cooking and air frying in one appliance, with a lid for each job.
Think twice if: worktop space is tight. It’s large and heavy.
Paid link
If you mostly want crispy food for one or two, a dedicated air fryer is simpler and cheaper than an all-in-one. Our air fryer guide covers sizing.
Leaning towards an air fryer? Compare layouts in single basket or dual drawer. Batch cooking for the freezer? Read freezing food properly.
Quick answers
Can a pressure cooker replace a slow cooker?
Many multi-cookers have a slow-cook setting, so one appliance can cover both. Dedicated slow cookers are cheaper and simpler if that’s all you need.
Is it safe to leave a slow cooker on while I'm out?
They’re designed to run unattended. Follow the manual, keep it clear of anything that could catch, and don’t overfill it.



