Who is this for?

Solo cooks short on space

If worktop or storage space is tight, check the appliance’s outside dimensions alongside the usable space for your dish. A small stated capacity alone will not tell you whether a handled gratin dish fits.

Cooks who prefer oven-style baking

If you use a ceramic or glass ovenproof dish and want to follow a conventional oven recipe, look for suitable temperature control, a baking mode and a rack position that leaves the clearance required above the food.

Buyers wanting several cooking functions

If the appliance will also be used for air frying, roasting or reheating, an air-fryer oven may suit your plans. Check dish compatibility and allow for recipe adjustments and cleaning after use.

What matters when choosing?

Conventional or convection mini oven

Choose it when: You want to bake gratin in an ovenproof dish using familiar oven-style settings.

Allow for: A larger model taking more worktop space, while a smaller one may restrict dish width or height.

Air-fryer oven

Choose it when: You also want functions such as air frying or reheating and can fit a suitable gratin dish inside.

Allow for: Adjusting a conventional oven recipe and checking the dish as it cooks. Instant Pot UK’s conversion advice is a starting point for fresh food, not a gratin-specific setting.

Concern What to check Who this matters to
Dish fit and footprint Compare the dish’s full width, including handles, with the usable shelf or basket dimensions; allow for the appliance’s stated ventilation clearance. If my kitchen has little spare worktop space, I still need the whole gratin dish to fit. Around 36% of consumers would put dish fit and footprint first.
Baking control Check that the temperature range covers your recipe and that the timer and rack positions suit the dish and baking time. When I follow an oven recipe, I want control over the heat and room for the top to brown without placing the dish too near the element; roughly 29% of consumers would prioritise baking control.
Other cooking functions For an air-fryer oven, check for a Bake function, adjustable settings and space for a suitable ovenproof dish. If I will also air fry or reheat meals, I can accept adjusting my gratin recipe. About 21% of consumers would make those additional functions their primary concern.
Cleaning and placement Read the exact model’s instructions for worktop placement, unobstructed vents and cleaning removable parts. With creamy bakes, I want to be able to clean up easily and place the appliance safely; cleaning and setup would come first for around 14% of consumers.

Buying pitfalls

  • Assuming litre capacity guarantees dish fit

    A wide, handled or tall casserole can be awkward to place in a compact oven even when its food volume seems suitable. Shelf width, door opening and available height all matter.

    Measure the complete dish and compare it with the exact model’s usable dimensions. If those dimensions are not listed, ask the seller before ordering.

  • Treating air-fryer conversion advice as a fixed gratin recipe

    Dish depth, material and ingredients can affect how a gratin cooks. Instant Pot UK suggests reducing conventional oven temperature by 20°C and cooking time by around 20–25% as a starting point for fresh food, rather than as a guaranteed result for this dish.

    Check the gratin early and adjust subsequent cooks for your appliance, dish and recipe.

  • Overlooking ventilation and worktop placement

    Countertop appliances have hot surfaces and vents that must remain unobstructed. Placement requirements differ between models.

    Follow the exact manual. Instant Pot UK instructs Vortex Air Fryer Oven users to use a stable, level, non-combustible surface and keep vents clear; 100 mm of side clearance is listed for the Sage Smart Oven Pro BOV820BSS.

  • Applying an energy-saving claim to every gratin

    An Instant Pot UK energy comparison involving roast chicken and a different Vortex model does not establish how much energy your chosen appliance will use for one potato gratin.

    Compare energy information for the exact models you are considering, where available, rather than treating wattage or a different recipe’s result as a like-for-like measure.

Brands to consider for these oven formats

Tefal

The Optimo OF445840 represents a countertop mini oven with conventional and convection functions for buyers who prefer oven-style baking.

  • Tefal UK lists a 19L capacity, a maximum temperature of 240°C and a 120-minute timer for this model.
  • Check the usable dimensions against your dish and follow the model’s placement instructions; capacity alone does not establish fit.

Quest

The 35409A is a compact 9L mini-oven example for cooks prioritising a small appliance.

  • A 100–230°C adjustable thermostat, a 60-minute timer, a bake pan and a rack are listed.
  • Measure your complete gratin dish against the usable cavity and check whether the timer covers your recipe.

De'Longhi

The E12012W is a 12L conventional mini-oven example for comparison with smaller and larger countertop formats.

  • Conventional and grill modes, a 60–220°C adjustable thermostat and a 120-minute timer are listed.
  • Check dish dimensions and the cooking mode you intend to use before treating its stated capacity as sufficient.

Instant Pot

The Vortex Plus 13L illustrates an air-fryer-oven format for buyers who want to bake gratin alongside other countertop cooking tasks.

  • Instant Pot UK lists Bake, roast, grill, reheat and toast functions, with adjustable time and temperature.
  • Confirm that your ovenproof dish fits and adapt a conventional recipe cautiously; the brand’s fresh-food conversion advice is not a gratin-specific instruction.

Joybuy product choices

These two air-fryer-format choices have a stated Bake function. Consider them if you also want other cooking functions, but confirm that your gratin dish fits before choosing either one.

Tristar Multi Crispy FR-6964 10L air-fryer oven

Tristar Multi Crispy FR-6964 10L Air-Fryer Oven

Consider this if you want to bake a single gratin and use the appliance for other cooking tasks. Its stated features include 10 programmes, touchscreen controls, 1800W power and dishwasher-safe parts. Check the usable interior dimensions, ventilation instructions and your dish’s fit before buying.

View on Joybuy
Haier Flex HAF3ADW 11L air fryer with divider

Haier Flex HAF3ADW 11L Air Fryer with Divider

Consider this if you want an air fryer with a Bake function for gratin and other stated cooking modes. The 11L model has a divider, viewing window and dishwasher-safe parts. Confirm the usable basket dimensions, dish compatibility and timer duration for your recipe; follow the model’s worktop and ventilation instructions.

View on Joybuy

Frequently asked questions

What size countertop oven do I need for one potato gratin?

Choose by the dimensions of your ovenproof dish, not litre capacity alone. Measure its width including handles and its height, then check the model’s usable shelf or basket dimensions and the clearance required around the food.

Is a mini oven or an air-fryer oven more suitable for gratin?

A conventional or convection mini oven is the more straightforward choice if you want to follow an oven recipe in a fitting ovenproof dish. An air-fryer oven is an alternative if its dish space and Bake settings suit you, particularly when you will use its other functions; check the gratin early when adapting a conventional recipe.

Can I plug a countertop mini oven into a kitchen socket?

Check the electrical instructions for the exact UK model before connecting it. The Sage Smart Oven Pro BOV820BSS includes a plug for a 13 Amp socket, but that specification should not be assumed for another oven; follow its own instructions on the socket and any extension arrangement.

How should I place and clean an air-fryer oven?

Follow the exact model’s placement and cleaning instructions, keeping its vents clear. Instant Pot UK instructs Vortex Air Fryer Oven users to place it on a stable, level, non-combustible surface, then unplug it and allow it to cool before cleaning after use.

Does a higher wattage tell me how much energy a gratin will use?

No: wattage alone does not establish energy use for a particular dish and cooking time. Compare model-specific energy information on a comparable basis where available, rather than applying a different appliance’s or recipe’s energy claim to your gratin.