A smoke detector senses smoke particles in the air and suits bedrooms, hallways and living rooms. In the kitchen, steam and cooking fumes can set it off, so kitchens usually get a heat detector instead. A heat detector triggers when the temperature passes a set level or rises very quickly.
A smart detector does not just sound in the room where it hangs. The alarm reaches your phone as a notification and the other detectors in the house sound too. In a two-storey house, someone asleep upstairs hears about smoke in the downstairs kitchen straight away.
Homes with a gas boiler, water heater or stove should also have a carbon monoxide detector. Carbon monoxide has no smell, and a smoke detector will not pick it up.

