What is the difference between a cooker hood and a venting hob?

A venting hob extracts downwards through the hob surface instead of upwards into a canopy. What that buys, what it costs, and where it genuinely wins.

Difficulty: beginner
Time: 25 min
Read: 5 min

Short answer

A cooker hood sits above the hob and catches a plume that is already rising, which is the direction steam wants to go. A venting hob pulls the plume sideways and down through a slot in the hob surface, which fights buoyancy but removes the canopy entirely. The venting hob wins on islands and on sightlines, and costs considerably more.

The two do the same job from opposite directions, and neither is simply better. A hood works with the physics and is cheap and effective; a venting hob works against it and buys back the headroom, the sightline and the awkward ducting an island hood demands. The decision is usually about the kitchen rather than the extraction.

Ducted and recirculating extractor hoods in section

Step by step

Understand the direction of capture.Steam and cooking vapour rise because they are hot. A hood catches that rising plume in a canopy above. A venting hob draws it sideways into a slot between or behind the zones and down through a duct in the cabinetry. It has to overcome buoyancy to do it, which is why the fan works harder.
Recognise where the venting hob genuinely wins.An island with no wall to mount a hood on, a room where a canopy would block a view or a low ceiling, and any layout where ducting up and across a ceiling would be a major job. In those cases the venting hob solves a real problem rather than a cosmetic one.
Recognise where the hood wins.Against a wall with a short duct route, on any budget, and where tall stockpots are common — a tall pan blocks the sideways path to a downdraught slot but sits happily under a canopy. A good wall hood is also cheaper to replace when it fails.
Check what the venting hob needs beneath it.The motor and duct run through the base unit and often through the plinth or the floor. That usually means losing a drawer, and it means the cabinetry has to be planned around it. Retrofitting one into an existing kitchen is rarely straightforward.
Decide ducted or recirculating for either option.Both types come in both forms and the same rule applies: ducted removes moisture, recirculating does not. A recirculating venting hob with a large carbon filter in the base unit is a common arrangement on islands and carries the usual moisture compromise.
Compare the cleaning burden.A venting hob has a grease filter in the hob surface which lifts out, and a channel that collects boil-overs and needs emptying. A hood has filters overhead that need lifting down. Neither is bad; they are simply different chores in different places.
Price the whole installation, not the appliance.A venting hob is an induction hob plus an extraction system in one unit, and it is priced accordingly. Add the cabinetry work and the ducting through the floor or plinth. Compare that against a hood plus a straightforward wall duct before deciding.
Check the noise figure at a realistic setting.Because it works against buoyancy, a venting hob often runs at a higher setting for the same result. Compare noise at the setting you would actually use rather than at the quietest one on the specification.

Tips

If you cook with tall stockpots regularly, note that a venting hob's capture path is at hob level. A tall pan on the front zone can shield the slot from the pan behind it.
A venting hob concentrates two things — the hob and the extraction — into one appliance, so a failure of either takes both out of service. That is a real consideration on something this expensive.
Some venting hobs allow the extraction module to be serviced or replaced separately from the hob. Worth confirming before buying.
On an island, an in-line or external motor for a conventional hood is the other way to solve the noise and ducting problem, often for less money than a venting hob.

Common mistakes

Choosing a venting hob purely for looks in a kitchen that has a wall — Against a wall, a hood is cheaper, quieter for the same capture, and easier to replace. The venting hob solves the island problem, not the wall one.
Not planning the base unit before ordering — The ducting and motor take up a large part of the cabinet below. Deciding this after the kitchen is designed usually means losing more storage than expected.

Alternatives

Wall-mounted or chimney hood: The default. Works with the rising plume, cheapest for a given extraction rate, and simple to replace.
Island hood with an external motor: Keeps the canopy but moves the fan outside or into the loft, which is much quieter and copes with a long run. Usually cheaper than a venting hob.
Venting hob, ducted: Removes the canopy entirely and extracts moisture properly. Highest cost, cabinetry planning required, and it fights buoyancy.
Venting hob, recirculating: Common on islands where ducting is impossible. Catches grease and smell, returns heat and moisture to the room, and needs regular carbon filter changes.

Questions people ask

Does a venting hob extract as well as a hood?

For a pan on the zone next to the slot, yes. For a tall pan, a pan on the far zone, or a heavy rolling boil, a well-sized canopy above generally captures more, because it is working with the plume rather than against it.

Can I retrofit a venting hob?

Sometimes, but the base unit and often the floor or plinth need to accommodate the duct and motor. It is a kitchen alteration rather than an appliance swap and should be priced as one.

Are they noisier?

Not necessarily at the same fan speed, but they are often run at a higher speed to achieve the same capture, which makes them noisier in practice. Compare at the setting you would actually use.