Kitchens are where most domestic fires start and the one room where a smoke alarm cannot survive. That is not a contradiction anybody has solved cleverly: the answer is a heat alarm, interlinked with the smoke alarms in the rest of the house, accepting a later warning in exchange for a device that is still on the ceiling in a year.
Why not a smoke alarm
Toasting, frying, grilling and a hot oven all produce enough airborne particles to trigger an optical smoke alarm from across a normal kitchen. An alarm that sounds several times a week gets taken down or has its battery removed, and that is the observed behaviour rather than a theoretical risk. The heat alarm exists because a working later warning beats a removed earlier one.
Where a kitchen heat detector goes
On the ceiling, away from the wall, and positioned so it is not directly over the hob or the oven where normal cooking heat reaches it. The design standard for dwellings sets minimum distances from walls, light fittings and corners; the principle is that it sits in the space the hot layer will fill in a real fire but not in the plume of a working cooker.
What it will not catch
A slow smouldering fire in a kitchen, for example in a bin or a cupboard, may produce a great deal of smoke before it produces enough heat. That is the recognised limitation. It is another reason the kitchen alarm must be interlinked with the hall and living room smoke alarms, which will pick up smoke drifting out of the kitchen even when the heat alarm has not yet responded.
Open plan kitchens
Where the kitchen is part of a living space with no door, the simple rule breaks down and the design needs thought. Putting a heat alarm over the cooking area and a smoke alarm in the part of the room away from it is the usual approach, with the distance between them chosen so ordinary cooking does not reach the smoke alarm. This is a case where following a diagram written for a separate kitchen produces a bad result.
Heat detectors in kitchens, and the alarm they replace
What goes in is a heat detector rather than a smoke alarm, and the swap is the whole point: cooking makes smoke and steam as a matter of routine, so an optical or ionisation head in a kitchen is an alarm that will be disabled within a month by somebody who is tired of it going off while the grill is on. A heat detector responds to a rise in temperature instead, which cooking does not produce at the rate a fire does. The cost of that choice is honest and worth stating: it will not pick up a smouldering fire early, so the kitchen alarm is a late warning and the alarms outside the room are the ones doing the real work.
Questions people ask about kitchen heat alarm
Should a kitchen have a heat alarm or a smoke alarm?
A heat alarm, interlinked with the smoke alarms in the rest of the property. A smoke alarm in a normal kitchen will be triggered by cooking often enough that it gets disabled.
Where should a kitchen heat alarm be positioned?
On the ceiling, away from walls and corners, and not directly above the hob or oven. The design standard for dwellings gives the minimum distances.
What about an open plan kitchen and living room?
Use both: a heat alarm over the cooking area and a smoke alarm in the living part, spaced so that normal cooking does not reach the smoke alarm. The simple separate-kitchen rule does not transfer.
What does a heat detector tester do, and can the site use one?
It is a tool that applies heat to the sensor, usually a battery powered hot air unit on a pole, so the detector can be operated from floor level without a flame. A service engineer uses one to prove every heat detector on a rolling programme, because pressing the panel's test button proves the panel and not the device. A site can own one and many do, and the practical limits are that it is slower than it looks, that a soaked or dirty detector may not respond and needs replacing rather than retesting, and that the panel has to be in a state where somebody will not call the brigade while you do it.
What do the heat detector kitchen regulations actually say?
There is no regulation naming a kitchen heat detector, and two things make it the expected answer anyway. The guidance for domestic fire detection puts a heat rather than smoke device in a kitchen because cooking aerosols cause false alarms and a disabled alarm protects nobody, and in Scotland and Wales the legal standard for homes names a heat alarm in the kitchen explicitly. In a commercial kitchen it comes from the fire risk assessment and the system's category instead. So the honest answer to the search is: guidance and, in two nations, a legal standard, rather than a regulation of its own.
Where should a heat detector for kitchen ceilings go, and how far from the hob?
On the ceiling, near the centre of the room rather than directly above the hob or the toaster, and not in the path of the extract, which pulls the heat away from it. The guidance puts a minimum distance from a wall and from any light fitting, and the practical rule in a domestic kitchen is as central as the ceiling allows while keeping clear of the cooker's own plume. A heat alarm mounted directly over a hob nuisance alarms on every fried breakfast, and the household disables it, which is how a kitchen ends up with no detection at all.