Best Smoke Detectors of 2021

We scoured industry research, ratings, and reviews to bring you the best smoke detectors.

Best overall
First Alert Carbon Monoxide Detector
First Alert Onelink
  • Icon Pros  Light
    Photoelectric and electrochemical
  • Icon Pros  Light
    Interconnectable
  • Icon Pros  Light
    Smart
Budget pick
First Alert SA320CN
  • Icon Pros  Light
    Photoelectric and ionization
  • Icon Pros  Light
    Easy to install
  • Icon Pros  Light
    Reliable
Best combo
First Alert SCO5CN
First Alert SCO5CN
  • Icon Pros  Light
    Photoelectric and electrochemical
  • Icon Pros  Light
    Easy to install
  • Icon Pros  Light
    Detects CO and smoke
Basic pick
First Alert BRK 312OB
First Alert BRK 312OB
  • Icon Pros  Light
    Photoelectric and ionization
  • Icon Pros  Light
    Dual sensor
  • Icon Pros  Light
    One-touch silence button
Best false alarm prevention
Kidde i4618 Smoke Detector
Kidde i4618
  • Icon Pros  Light
    Ionization
  • Icon Pros  Light
    Interconnectable
  • Icon Pros  Light
    False alarm control

It’s easy to forget your smoke alarm’s there until it starts beeping or chirping. But while we take them for granted, they’re always looking out for us.

First Alert Onelink is expensive, but all its extras make it worth the price. On top of smart home connectivity, it offers remote notifications, Alexa capabilities, an Omni directional speaker, and it's Apple HomeKit compatible.



Compare smoke detectors and alarms

Smoke detector
List Price
Sensor Type
Carbon Monoxide Detector
Smart Features
Learn more

Best overall

First Alert Onelink

Photoelectric and Electrochemical

Icon Yes  Light

Yes

Icon Yes  Light

Yes

Budget pick

First Alert SA320CN

First Alert SA320CN

Photoelectric and Ionization

Icon No  Light

No

Icon No  Light

No

Best combo

First Alert SCO5CN

First Alert SCO5CN

Photoelectric and Electrochemical

Icon Yes  Light

Yes

Icon No  Light

No

Basic pick

First Alert BRK 312OB

First Alert BRK 312OB

Photoelectric and Ionization

Icon No  Light

No

Icon No  Light

No

Best false alarm prevention

Kidde i4618 Smoke Detector

Kidde i4618 (pack of 6)

Ionization

Icon No  Light

No

Icon No  Light

No

*Amazon.com price as of 07/22/2021 at 12:20 p.m. (MT). Read full disclaimer.

Smoke alarm and detectors reviews

1. First Alert Onelink Smoke Detector: Best overall

Techie pick
First Alert Carbon Monoxide Detector

*Amazon.com list price as of 07/22/2021 at 10:42 a.m. (MT). Read full disclaimer.

The First Alert Onelink comes armed with a photoelectric smoke detector and an electrochemical sensor for catching carbon monoxide.

But, on top of keeping your family safe, it comes with a built-in Alexa assistant. You can speak to the smoke alarm to get the weather, play music, and set timers. Plus, you can install it anywhere a normal smoke detector goes—like your kitchen or bedroom.

Pro Heading
Pros
Pro Bullet Smart mobile alerts
Pro Bullet 400 safety checks
Pro Bullet Alexa built-in
Con Heading
Cons
Con Bullet Only compatible with Apple smart devices

It connects to your Wi-Fi and sends alerts to you through an app. If something goes wrong while you aren’t home, you’ll know. It still has some old-school features too. On top of voice alerts, it has a powerful 85 dB alarm that goes off when it detects smoke, fire, or CO gas.

We like how customizable and connected the Onelink smoke detector is. The drawback is it's expensive for a fire alarm. We recommend the Onelink if you already enjoy smart home devices or have a steady home automation system in place.

2. First Alert SA320CN: Budget pick

Budget Pick
First Alert SA320CN

*Amazon.com list price as of 07/22/2021 at 10:42 a.m. (MT). Read full disclaimer.

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 is a brand that's been around since 1958 and is highly trusted.

Pro Heading
Pros
Pro Bullet Trustworthy
Pro Bullet Affordable
Con Heading
Cons
Con Bullet Battery-operated only
Con Bullet No home automation compatibility

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.

Bell
Smoke detectors for people with hearing loss

If you or someone in your family experiences hearing loss or deafness, a wire-in strobe light can help. These devices connect with your existing smoke and fire alarms. When the smoke detector senses danger and sounds the alarm, the strobe light will flash to signal trouble.

3. First Alert SCO5CN: Best combo

Best combo
First Alert SCO5CN

*Amazon.com list price as of 07/22/2021 at 10:42 a.m. (MT). Read full disclaimer.

The First Alert SCO5CN not only detects smoke, it also detects unsafe levels of carbon monoxide in your home (CO). 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.

Pro Heading
Pros
Pro Bullet Alerts you when your smoke or CO detector goes off
Pro Bullet Offers professional monitoring
Pro Bullet Voice alarm
Con Heading
Cons
Con Bullet Does not work as a stand-alone alarm

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.

4. First Alert BRK 312OB: Best basic pick

Best Basic Pick
First Alert BRK 312OB

*Amazon.com list price as of 07/22/2021 at 10:42 a.m. (MT). Read full disclaimer.

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.

Pro Heading
Pros
Pro Bullet Dual sensor
Pro Bullet One-touch silence button
Con Heading
Cons
Con Bullet Basic design

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.

Although this smoke detector has two smoke sensors, it doesn’t come with carbon monoxide detection.

5. Kidde i4618 Firex: Best false alarm prevention

Best False Alarm Prevention
Kidde i4618 Smoke Detector
Kidde i4618
$42.22

*Amazon.com list price as of 07/22/2021 at 10:42 a.m. (MT). Read full disclaimer.

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

Pro Heading
Pros
Pro Bullet Affordable
Pro Bullet Interconnectable
Pro Bullet Equipped with false alarm control
Con Heading
Cons
Con Bullet Incompatible with older models

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.

The Firex has only an ionization sensor. While this provides early detection for fire particles, which is useful in a flaming blaze, it doesn’t provide accurate detection for smoldering fires.

What to consider when buying a smoke detector

In 2019 there were an estimated residental 354,400 fires. 1  If you have smoke detectors in your home, you’ll have a better chance of getting everyone out safely. While any smoke detector is better than none, there are a few things to look for when buying a new smoke alarm:

Multifunctional

The best smoke alarms can detect smoke particles, flames, and carbon monoxide. A multifunctional alarm can save you battery life or energy from your house for hard-wired smoke detectors. Combination smoke, fire, and carbon monoxide detectors are easier than ever to find.

Smart

While classic ionization and photoelectric smoke detectors are helpful, smart smoke detectors are the cutting edge in fire safety. They communicate through apps and deliver alerts to your phone or other mobile devices if an alarm sounds.

Smart alarms can talk to each other too, so you’ll know exactly where the fire is when an alarm is triggered. The only downside is that smart devices are more expensive.

Backup power

If your home's power goes out, you still need to know if there's a fire or smoke emergency. Hard-wired smoke detectors need to have a battery backup or some other backup power source to keep them running.

If the power goes out, it takes your smoke detector with it. Battery powered smoke detectors should have a test button or chirp when the battery starts to drain.

Subscribe to our Youtube channel for more videos like this one! Learn how to protect your home, your loved ones, yourself, and your belongings.

Types of smoke detectors

Smoke alarms typically have three types of sensors: ionization, photoelectric, and dual. Here are the main differences between the three.

Photoelectric

Photoelectric smoke alarm sensors use light to detect smoke. When smoke particles are suspended in the air (as with a smoldering fire) the particles scatter the beam of light in the sensory chamber, which sets off the alarm.

Ionization

Ionization smoke detectors use radiation and an ionization chamber to detect smoke. The ionizing radiation helps detect small amounts of smoke in the air, as with a flaming fire. When smoke enters the sensor chamber, the current of the ionizing radiation is disrupted, which triggers the alarm.

Dual sensors

Dual sensors include both photoelectric and ionization sensors. These are considered the safest smoke and fire detection devices. Because they detect both flaming fires and smaller, smoldering fires, it’s unlikely that any fire-related danger will get past these double-duty sensors.

Smoke detector installation and maintenance

Smoke alarms can save a life, but they have to be properly installed and maintained. Don’t risk your family’s safety—use these tips to keep your smoke detectors in tip-top shape.

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 percent 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 ten feet from cooking areas.

For vaulted ceilings, avoid putting smoke detectors in the “pitch” of the roofline. Instead, mount fire alarms three 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.

How we reviewed the best smoke detectors

To determine the best smoke alarms, we scoured industry research and evaluated product features, performance, and specs. We consulted the National Fire Protection Association and US Consumer Product Safety Commission for guidance and pored over expert ratings and real customer reviews.

Our five best smoke alarms were selected from 12 top devices that were compared for reliability, effectiveness, price, and customer satisfaction. Learn more about how we conduct reviews like this one from our methodology page.

Smoke detector FAQ

If your smoke detector is beeping regularly, it could be because the batteries are running low. 

Try changing the batteries first and if the beeping continues, the device may be sending false alarms. Make sure it's far enough from the bathroom or stove to avoid sensing heat or steam any time you use the room.

There are pros and cons to smart smoke detectors, but it boils down to your preference and budget.

Smart smoke detectors connect to your phone, allowing you to know when the alarm sounds when you aren’t home. But these aren’t totally foolproof either. They’re connected to your Wi-Fi, so if your internet connection drops, you may be without protection.

For the best results, we recommend testing your smoke detectors once a month. You’ll always be ready for an emergency and this will prevent false alarms and beeping from drained batteries.

You should have at least one smoke detector per floor and outside of each of your sleeping areas.

Smoke and fire detectors warn you when an emergency happens, but how do you prevent a fire in the first place?

Start with a few common safety practices like careful cooking, cleaning out lint traps frequently, and storing flammable products safely. It's also a good idea to keep a fire extinguisher on hand in the house and show everyone how to use it.


1. US Fire Administration, "US Fire Statistics." Accessed July 22, 2021.
2. National Fire Protection Association, “Smoke Alarms in U.S. Fires” Published February 2021. Accessed July 22, 2021.

Disclaimer

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. Safewise.com utilizes paid Amazon links.

Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.

Katie McEntire
Written by
Katie McEntire
As a renter, pet-owner, and woman living alone, Katie McEntire takes safety seriously. She’s tested devices like pet cameras, home security systems, and GPS trackers in her own home and devices in the name of safety. In addition to testing, writing, and reviewing for SafeWise, she also makes videos for the site’s YouTube channel. She’s been featured on publications like TechGuySmartBuy, Forbes, Healthy Moms, and Digital Care. Katie has a Bachelor’s degree in Technical Writing from Austin Peay State University in Clarksville, Tennessee. She’s held previous writing positions at Overstock.com and Top Ten Reviews.

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