The Nest Protect passed our sealed incense test with flying colours: the smoke alarm went off first, followed by the CO alarm five minutes later; according to the app, the CO level was 414ppm and increasing. We can’t think of a better CO currently alarm on the market, particularly as it also detects smoke. But most will still notify your phone if they detect something, and can easily communicate with others in the collection. Many will also give you voice notes, either telling you out loud what they have detected or giving instructions.

Carbon monoxide sensors have a finite lifespan of between five and seven years, although a few manufacturers now claim that their sensors will last a full ten years. Generally speaking, it’s worth playing it safe and replacing your alarm a year or two before its life is supposed to run out. Tests in the US have shown that alarms over eight years old can fail to detect CO at levels of above 400ppm. Ionisation– More like an electric nose. These are often the less expensive type. They detect physical smoke particles as opposed to seeing the signs of a fire. The particles enter the ionisation chamber through open vents, and the current inside the chamber is changed. This causes the alarm to sound. They are best for placement in landings and hallways, but not too close to kitchens or bathrooms as they are prone to false alarms. The humidity sensor and advanced algorithm can sense any false alarms before it disturbs you so that you won’t be bothered by the steam from a shower and it’ll learn what not to look out for.

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You can also silence any false alarms from the phone, to save you having to reach for the button and stop what you’re doing. If you want to buy several Eve alarms, they are easy to sync with each other to ensure effective communication, and mass sound should something be up. Testing is done manually by a simple press and hold of the large central button. Visual test red light flashes also go off around every 30 or so seconds, so if you feel you’ve gone a little while without seeing the light, you know you have to act. Officially seen as the World’s smallest smoke alarm at just 4cm in diameter, this Cavius is not just a novelty. If you need a bit of a visual guidance, it is basically the size of a golf ball. Despite its size, it works just as well as its larger rivals. All of the major manufacturers (Aico, FireAngel and Kidde) make smoke and heat alarms that will work in combination with one another and we have tested pairs of smoke and heat alarms from each of them.

Unlike other CO detectors, the Nest notifies you (and anyone else who has registered) with a notification on your mobile device, even if you’re in another country. It also does the same for smoke. The main unit also speaks a warning in a calm English female voice when it detects smoke or CO in a room. If the CO levels are slowly increasing, the voice will warn you before setting off the alarm. But if CO levels become dangerously high, the centre lamp glows red and a very loud, high-pitched beep is emitted along with a spoken warning letting you know which room is affected. You can temporarily cancel any alarms by holding the “Stop” button on the app or by pressing the unit’s central button. Some smart models sound an alarm on your smartphone and through the alarm itself when triggered – this is the most helpful kind of smart alarm. It’s also worth noting that the test button on these devices doesn’t actually test the sensor – it only makes sure that the circuit’s working.

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It sounds a loud 85dB alarm if it detects a problem, but it won’t be going off at every sign of a false alarm. The enhanced optical technology gives protection against even smouldering fires, but won’t become a nuisance with daily cooking fumes. electrochemical. The advantage of this type of sensor is that it allows not only detecting smoke but also measuring the concentration of gasses, which makes them absolutely a must for private houses and other premises that use the gas heating system. Most people will not experience any symptoms from prolonged exposure to CO levels of under, say, 40ppm. It depends on the length of exposure, but the real danger level starts at around 400ppm (two to three hours of exposure at this level can be life-threatening). To give you some idea of how dangerous higher levels of concentration can be, 1,500ppm could result in death within an hour and 6,000ppm within 15 minutes.