Best Smoke Detectors of 2021

The Google Nest Protect keeps your home protected in more ways than one. Sure, it can detect smoke, but with its split-spectrum sensor, it detects smoldering fires as well as fires with active flames. It also detects carbon monoxide with an electrochemical sensor.

When a smoke or carbon monoxide detector is triggered, the Nest Protect will flash its built-in light, sound an alarm, and use voice alerts to let you know exactly what type of emergency it's detecting. It also sends alerts to your phone through the app.

The First Alert SCO5CN not only detects smoke–it also detects unsafe levels of carbon monoxide (CO) in your home. Carbon monoxide is a colorless, orderless gas that can be deadly. Getting a CO detector is important because this gas is impossible to detect on your own.

On the front of the alarm, there are lights to let you know if there is a fire or CO emergency. Our favorite part is that the easy-access battery compartment makes it easy to change the batteries without removing it from the wall or ceiling. 

Our guide can help you can learn more about CO detectors and the dangers of carbon monoxide gas.

The X-Sense is a little different from its competitors because it has a built-in digital display. You can see the battery level at a glance, and the display also features current CO levels in your home. It updates every 10 seconds, you get up-to-date readings.

The display changes color to tell you if there's something wrong too. Red means the alarm is going off, yellow means there's something wrong with the alarm, and green means everything is a-okay.

Another helpful feature is this smart smoke detector prevents false alarms. It takes three air samples before sounding the alarm.

The First Alert SA320CN is fairly basic compared to our top pick. It's reliable, though, and that's the most important thing when it comes to fire detection. Plus, First Alert has been around since 1958 and is highly trusted.

The 85-decibel siren could be louder, but we think it should do just fine if you place multiple alarms throughout your home. It can detect both fire and smoldering using its dual sensors, and it has a testing button that can also be used to mute the alarm.

It's not the flashiest, but we think it's a great pick if you need a budget-friendly, no-fuss smoke detector.

With Kidde smoke alarm changing batteries has never been easier. It’s simple to keep this smoke detector ready for action with the slide-load battery door on the front. This is the only smoke detector on our list with a quick-change battery.

This Kidde smoke alarm is also easy to install and can be interconnected with other alarms to create a full-house smoke detection system.

This First Alert smoke alarm uses a dual sensor to detect multiple kinds of fires and decrease false alarms. It’s also hardwired with a battery backup so you don’t have to worry about power failure.

Say goodbye to shrieking beeps while you’re cooking or after a hot shower. The First Alert BRK 3120B comes with a photoelectric sensor that’s sensitive enough to tell the difference between everyday activities and real threats like a smoldering fire.

While we liked this one, it had some shortcomings. Although this smoke detector has two smoke sensors, it doesn’t come with carbon monoxide detection. It is also priced a little high for how basic it is.

Check batteries: According to a 2021 report, dead batteries are a major factor in smoke alarm failures. In fact, the death rate from a home fire is 55% lower in homes with working smoke alarms.²

A smoke detector won’t do you any good if it isn’t working, so make sure to check your batteries every month and use the “test“ button intermittently to ensure proper function.

Arm every level: The National Fire Protection Association (NFPA) recommends putting a smoke detector on every level of your home: in every bedroom, outside every sleeping area, and in your basement. On floors without bedrooms, install alarms in the living area or near stairways.

If you have a large home, consider adding even more to cover the whole footprint.

Mount high: Smoke rises. It’s important to put your smoke detectors within a foot of your ceilings and 10 feet from cooking areas.

For vaulted ceilings, avoid putting smoke detectors in the “pitch” of the roofline. Instead, mount fire alarms 3 feet below the ceiling so they can accurately read smoke.

Never run out of batteries: Set up recurring delivery for smoke alarm batteries on Amazon. That way, you’ll always be ready to replace a dead battery in your smoke alarm. Time the delivery schedule to match regular smoke alarm maintenance so you’ll never overlook changing out old batteries.

Keep it clean: Dirt and debris interfere with the sensors on your smoke alarm. Dusty buildup can lead to false alarms or delayed detection during an emergency. Whether you have a photoelectric alarm or an ionization detector, regular cleaning will keep your smoke alarm in working order.

Dodge drafts: Keep smoke alarms away from windows, doors, and air ducts. Drafts can disrupt the operation of smoke detectors and increase the occurrence of nuisance alarms.

Get connected: Connecting your smoke alarms ensures everyone in your home knows about the emergency. You can install the connection easily and it will sound the siren throughout the house using each of your fire alarms. It takes a few extra steps to set up and test, but it means family members in every room will get the warning.