A pyrolytic cycle cleans the oven cavity well: the door locks, the empty oven heats far beyond cooking temperature (AEG says 500°C) and baked-on fat turns to ash that you wipe out once it has cooled. It does not clean what the manual tells you to take out first, usually the racks and shelf runners, and it leaves the area around the door seal to you. The hob and extractor are outside its reach. A professional clean covers those parts, so the two do different jobs.
How a pyrolytic cycle works
Pyrolysis is cleaning by heat. You clear out everything the manual lists and choose a level; the oven then locks its door and heats the empty cavity until fat and food residue turn to a light ash. AEG puts the temperature at 500°C, and Miele says 400°C and above. The door stays locked until the cavity has cooled, and then the ash comes out with a damp cloth.
| Maker and source | Settings and time | Electricity per cycle | How often |
|---|---|---|---|
| Neff, B57CS24H0B manual | Light about 1h 15min, medium about 1h 30min, intensive about 2h | 2.5–4.7 kWh | Higher setting the dirtier the oven |
| Bosch, Series 8 HBG7741 manual | Low about 2h 15min, high about 2h 30min | 3.9–4.8 kWh | Every 2–3 months |
| AEG support guide | Quick 1h, normal 1.5h, intense 3h | Not stated | The oven reminds you |
| Miele UK | A couple of hours | Not stated | Every 4–6 months |
At the Ofgem price cap rate for October to December 2026, 26.32p per kWh, a cycle using 2.5 to 4.8 kWh costs about 66p to £1.26 in electricity. Add the cooling time to the cycle time, because the oven cannot be opened until the lock releases.
The parts the manuals leave to you
Every manual here starts the cycle with a preparation list, and that list is where the hand work is.
- Racks and runners. Neff says the wire rack, shelf supports and pull-out rails discolour if left in, and AEG says to remove accessories and removable shelf supports. Bosch's Series 8 manual lets the shelf supports stay in but says never to clean accessories during the cycle. The exception is kit made for it: Miele's PyroFit racks and FlexiClip runners are built to stay in.
- Trays. Neff warns that the cycle destroys non-stick coatings on baking trays and tins, which release noxious gases, so only enamelled accessories without a non-stick coating can go through it.
- The door seal. Bosch and Neff both say never to scrub or remove the seal, and to clean the edges of the cavity around it by hand before the cycle.
- The inner door glass. Bosch says to use oven cleaner on stubborn dirt on the inner door pane first; Miele suggests taking the inner glass out before cleaning or wiping it with a mild detergent afterwards.
- The hob and extractor, which sit outside the oven.
Bosch also notes that the stainless steel frame on the inside of the door discolours during the cycle, which a stainless steel cleaner removes.
Ventilate the kitchen while the cycle runs
The cycle gives off fumes. Bosch and Neff warn that the vapours can irritate the mucous membranes, and tell you to keep the kitchen well ventilated, not to stay in the room for long, and to keep children and pets away. AEG is firmer about birds: remove pets, especially birds, from the area during and after cleaning, and keep small animals somewhere well ventilated. Miele's own blog is more relaxed and says pets can stay indoors, though you may want them out of the kitchen. If you keep a bird in a flat with one small kitchen window, follow the strictest of these.
Catalytic liners are a different system
Self-cleaning can mean either of the first two systems below, and neither covers the whole oven.
- Pyrolytic cleaning
- A separate programme. The door locks and the empty cavity is heated to around 400–500°C until residue turns to ash. You run it every few months.
- Catalytic liners
- Panels with a rough, porous, matt ceramic coating that absorb splashes and break them down while you cook. On Bosch's HBS534 only the back wall has one; the rest of the cavity is smooth enamel.
- Hand clean
- Racks and runners soaked, cavity and glass degreased by hand, and the door taken apart where its design allows. This is the professional clean described below.
Catalytic panels have limits of their own. Bosch says not to use oven cleaner or abrasive cleaning aids on them, that residues of sugar and egg white are not removed, and that if dark stains appear you heat the empty oven on 3D hot air at maximum for an hour. Bosch also warns that panels which are not cleaned regularly can be damaged.
A pyrolytic cycle against a professional clean, part by part
| Part | Pyrolytic cycle | Professional clean (London Oven Cleaners) |
|---|---|---|
| Cavity walls, roof and floor | Burnt to ash, wiped out once cool | Degreased by hand |
| Racks, trays and runners | Taken out first unless rated for pyrolysis | Taken out, soaked and cleaned separately |
| Inner door glass | Stubborn dirt pre-cleaned (Bosch) or inner pane removed (Miele) | Door split where its design allows; glass degreased by hand |
| Around the door seal | Wiped by hand before the cycle; the seal is never scrubbed | Cavity edges degreased by hand |
| Hob and extractor | Not reached | Can be added to the visit: ceramic hob £23, gas hob £28, extractor £28 |
| Time | About 1 to 3 hours, plus cooling with the door locked | About 90 minutes for a single, about 2 hours for a double |
| Cost | About 66p to £1.26 of electricity | £77 for a single, £110 for a double, fixed on the phone |
When a professional clean makes sense on a pyrolytic oven
Use the cycle for the cavity, and book a hand clean when the parts it skips have fallen behind: racks and runners that come out before every cycle and are never properly cleaned, grease between the panes of the door glass, or a hob and hood that want doing at the same visit.
Moving out is another reason. The check-out report is compared with the check-in report for the whole oven, racks included, and our guide to the oven and your deposit sets out the rules. A heavily soiled oven is a third: Bosch and Neff both tell you to remove coarse dirt before a cycle, because loose food remnants, fat and meat juices can catch fire during it.
London Oven Cleaners take out the racks, trays and side runners to be soaked and cleaned separately, and degrease the cavity, fan cover and door glass by hand. Some teams bring a heated tank on the van and use it when they can park close; otherwise the whole job is done in your kitchen, at the same price, and you can ask which applies when you book. The oven is reassembled and heated, and you look inside before we pack up. Every size is on our prices page, and professional oven cleaning explains the visit.
Pyrolytic oven questions
Can the racks stay in during a pyrolytic cycle?
Only if the maker says so. Miele's PyroFit racks and FlexiClip runners are made to stay in. Neff says ordinary wire racks, shelf supports and pull-out rails discolour, and Bosch's Series 8 manual says not to clean accessories during the cycle.
How much electricity does a pyrolytic cycle use?
Between 2.5 and 4.8 kWh on the Neff and Bosch models in the table, which is about 66p to £1.26 at the Ofgem cap rate for October to December 2026.
How often should I run the cycle?
Bosch says every two to three months for its Series 8 ovens, and more often if needed; Miele suggests every four to six months. Neff's advice is to choose a higher setting the dirtier the oven and the longer the dirt has been there. Our guide to how often to clean an oven covers the rest of the schedule.
Why does my oven smoke during the cycle?
Loose debris and thick fat burn before they turn to ash, which is why the manuals tell you to remove coarse dirt first. If smoke does appear, Bosch's instruction is to switch the oven off or unplug it and keep the door closed to stifle any flames.
Is it safe to be at home during a cycle?
The makers mostly say yes, with conditions. AEG says the fumes from its ovens are safe for people, and Miele says it is perfectly safe to be in the home; Bosch and Neff ask you to ventilate the kitchen and not to stay in the room for long. The outside of the oven gets very hot, so Bosch and Neff say to keep children away, hang nothing combustible on the door handle and leave the front of the oven clear.