Choosing a built-in oven: from capacity to pyrolytic cleaning

Installation dimensions come before everything else

Almost every built-in oven has a 60 cm front, but it is the cabinet cut-out that governs the choice, not the front panel. Three measurements must be taken before comparing anything: the width, height and depth of the aperture, usually around 56 to 57 cm wide, 59 to 60 cm high and 55 cm deep.

A few millimetres out is enough to prevent installation or to leave an unsightly gap. Product sheets always give these installation dimensions separately from the overall dimensions: those are the ones to check against your cabinet, tape measure in hand.

Allow for ventilation too. A built-in oven needs air to circulate behind and beneath it, and the manuals specify precise clearances. Blocking them raises the temperature of the electronics and shortens the appliance life.

One last point that is often forgotten: the supply. A built-in electric oven connects to a dedicated circuit with its own protection. A socket shared with other kitchen appliances trips repeatedly as soon as several loads run together.

• Measure the width, height AND depth of the aperture, not the front
• Typical figures: around 56 to 57 cm by 59 to 60 cm, 55 cm deep
• Respect the ventilation clearances given in the manual
• Dedicated electrical circuit with its own protective device

Usable capacity: what 65 or 77 litres change day to day

Usable capacity is expressed in litres and usually falls between 60 and 80 litres on a 60 cm oven. The gap looks modest on paper. It is not, in practice.

Below 65 litres, a standard baking tray already fills the width and cooking on two levels becomes awkward because the air circulates poorly. Around 70 to 77 litres, the cavity takes a decent-sized bird, two trays at once, and leaves enough room around dishes for the air to move properly.

That capacity does not depend on external dimensions alone: insulation, door thickness and cavity shape all count. Two ovens with identical cut-outs can differ by ten litres, and that is a more meaningful comparison than the advertised power rating.

For one or two people who rarely cook large quantities, 60 to 65 litres is ample. For a family, for baking or for holiday meals, aiming at 70 litres and above avoids most of the frustration.

• Under 65 L: fine for one or two people, single-level cooking
• 65 to 70 L: the all-round format for most kitchens
• Over 70 L: whole bird, two levels, comfortable baking
• Compare litres at equal cut-out: the difference is in the cavity

Conventional, fan and fan-forced heating

A conventional oven heats with two elements, one at the top and one at the bottom. Heat rises, cooking is slower and less even, but it suits gratins, roasts and anything that benefits from a firm crust.

Fan heating adds a fan that stirs the air in the cavity. The temperature becomes even from top to bottom, which allows cooking on two or three levels at once without much transfer of flavours, and generally lets you lower the set temperature by around twenty degrees compared with conventional heating.

Fan-forced heating, sometimes called true fan or ring-element heating, adds a circular element around the fan. The moving air is therefore heated at the moment it is stirred, the oven comes up to temperature faster and evenness improves further. It is the most versatile option.

In practice, a modern multifunction oven offers these modes and a few more, including a grill, base heat alone and often a pizza setting combining strong base heat with the fan. The number of programmes matters far less than the presence of genuine fan-forced heating and a grill with enough power.

• Conventional: simple, good for gratins and roasts
• Fan: several levels at once, even temperature
• Fan-forced: faster to heat, the most consistent
• Look for the useful modes, not the number of programmes

Pyrolytic, catalytic or steam cleaning

This is the criterion that separates ranges most sharply, and the one people most regret overlooking.

Pyrolytic cleaning takes the cavity to around 500 °C and reduces splashes to ash, which a wipe then removes. The result has no equal. In exchange, a cycle runs for one to three hours, consumes noticeably, heats the surrounding cabinet and locks the door while it works. A pyrolytic oven is also better insulated, so often heavier and dearer.

Catalytic cleaning relies on porous liners that absorb and oxidise fat during high-temperature cooking. There is no dedicated cycle, but cleaning stays partial: the door, base and roof still need doing by hand, and catalytic panels are exhausted after a few years.

Steam or hydrolytic cleaning, finally, heats a little water in the cavity to soften soiling, at low temperature and in about twenty minutes. It uses very little energy and suits a lightly used oven, but it is quite inadequate against baked-on fat.

The rule is simple: if you cook often and richly, pyrolytic cleaning pays for itself in convenience. If the oven mostly reheats and cooks covered dishes, steam or catalytic cleaning is enough.

• Pyrolytic: complete cleaning, long thirsty cycle, better-insulated oven
• Catalytic: self-cleaning liners, partial result, panels wear out
• Steam: quick and frugal, effective only on light soiling
• Choose on how often you cook, not on price alone

An energy label that has not been rescaled

Beware a reading trap. Washing machines, dishwashers and refrigerators moved in March 2021 to a deliberately demanding A to G scale on which an A is rare. Ovens did not follow: they are still shown on the older scale, from A+++ to D.

An oven rated A+ therefore does not compare with a dishwasher rated A+, and an A+ on an oven should not be read as a poor result. On that scale most domestic ovens sit between A and A+, and the real consumption gap between neighbouring classes stays modest given the hours of annual use.

The product sheet also gives consumption per cycle, in kWh, for conventional and fan heating. That is the most concrete figure. It rises mechanically with cavity size, which is why a large well-rated oven uses more than a small poorly rated one.

Every labelled model is registered in the European EPREL database, publicly searchable from the identifier printed on the label. That is the source to use when checking a stated value.

What really changes in daily use

A handful of details weigh more than long lists of programmes.

Telescopic runners spare you pulling a hot tray out at arm’s length and remove any risk of tipping. On an oven used daily, it is the single most useful option.

A cool door, made of three or four panes, keeps the outer face at a bearable temperature. It becomes essential as soon as young children move around the kitchen, particularly with an oven fitted under the worktop.

A meat probe, which stops the oven once the core temperature is reached, transforms the cooking of joints. LED lighting and smooth enamel make monitoring and cleaning easier. Controls, finally, are judged in use: a poorly designed touch panel proves more irritating than a well-detented mechanical knob.

Consider fitting the oven at eye level in a tall housing unit rather than under the worktop. It saves bending down with a heavy hot dish and makes watching a bake far easier.

• Telescopic runners: the most useful option day to day
• Cool three or four pane door where children are about
• Meat probe for joints, core temperature under control
• Eye-level housing rather than under the worktop where possible

Frequently asked questions