10 Best Hardwired Smoke And Co Detectors of 2025

Tested and Reviewed: Top 10 Hardwired Smoke And Co Detectors deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

First Alert

FIRST ALERT BRK SC9120B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, White, Pack of 3

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Editor's bottom line:

“This hardwired smoke and co detectors is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Keep your family safe with this 3-pack of hardwired smoke and carbon monoxide alarm; The battery backup means constant monitoring, even if there's a power failure
Features an electrochemical carbon monoxide sensing technology as well as an ionization sensor that detects the fine particles of a fast-burning fire
Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection
Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected
Simple to use, with a single test/silence button, and side-load battery compartment; Tamper-resistant locking brackets and universal mounting brackets make installation easy. Dust cover

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Picked by 397 people today

9.5

First Alert

First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack

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Main Highlights

First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
Through early warning interconnect, when one alarm sounds, all compatible
Quick Connect Plug allows for easy installation with no need to rewire
Battery backup provides continuous protection during power outages
Test/silence button for efficient testing to ensure alarm is working properly

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9.5

First Alert

First Alert SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup 2 Pack

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Main Highlights

Hardwired CO smoke alarm features battery backup for constant monitoring
Can connect to other compatible BRK or First Alert CO smoke detectors
Lights indicate if the alarm is for smoke or for carbon monoxide
Single test silence button for simple operation
Side-load battery compartment for convenience

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9.2

BRK

BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack

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Main Highlights

Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failure
Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm
To ensure complete protection make sure to place one on each level of your home and in each bedroom
Can connect to other compatible BRK or first alert smoke detectors, to ensure all alarms will sound when smoke is detected
Simple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easy
Rigorously tested to meet UL standards120 volt AC power with 9V battery backup to keep alarm functioning during power outage
First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety

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9.0

First Alert

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack

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Main Highlights

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
Through early warning interconnect, when one alarm sounds, all compatible alarms will sound
Quick Connect Plug allows for easy installation with no need to rewire
Battery backup provides continuous protection during power outages
Test/silence button for efficient testing to ensure alarm is working properly

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8.8

First Alert

First Alert BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack

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Main Highlights

6 pack of hardwired smoke alarms, includes battery backup for power outages
Tamper resistant locking pins, single button silence/test and loud 85Db alarm
120-Volt AC power with 9-volt battery backup (included) to keep alarm functioning during power outage
Open mounting design for easy installation with side load battery compartment for quick replacement and interconnect able up to 18 units (12 smoke, 6 co/heat/relay)
10-Year limited
Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety

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8.6

First Alert

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack

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Main Highlights

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency.
Through early warning interconnect, when one alarm sounds, all compatible alarms will sound
Battery backup provides continuous protection during power outages
Alarm indicator visually identifies the unit that initiated the alarm
Quick Connect Plug included allows for easy installation with no need to rewire

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8.3

First Alert

First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup

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Main Highlights

Superior carbon monoxide sensor and dual ionization smoke alarm
Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms
Easy to install universal mount bracket
Simple to use silence/test button; separate smoke and CO latching alarm indicators
9-volt battery included; 10-year limited warranty
Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety

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8.1

BRK SC9120B Smoke and Carbon Monoxide Alarm

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Main Highlights

Superior carbon monoxide sensor and dual ionization smoke alarm
Simple to use silence/test button; separate smoke and CO latching alarm indicators
9-volt battery included; 7-year limited warranty
Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms
Easy to install universal mount bracket

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8.1

Kidde

Kidde Hardwired Smoke & Carbon Monoxide Detector, AA Battery Backup Smoke Alarm, Interconnectable, LED Warning Light Indicators, 2 Pack

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Main Highlights

2-IN-1 DETECTION: Alerts you to both smoke & carbon monoxide (CO) using a single, cost-effective detector.
HARDWIRED & 2 AA BATTERY BACKUP (Included): Operates on 120V AC wiring (installed in the ceiling) with 2 AA alkaline batteries that provide battery backup coverage during power outages.
ENHANCED SENSING TECHNOLOGY: Reduces false smoke alarms often caused by cooking. Comprehensively tested to meet the latest UL standards, meets UL 217 9th Edition, UL 2034 4th Edition, & FCC standards.
INTERCONNECT CAPABILITY: When one alarm sounds, they all sound, so you can get out faster. (Different models offer different interconnection options and requirements. See User Guide for more info.)
SELF-TESTING ALARM: Internal components ensure alarm is always operating as expected. Not a substitute for a manual push test, perform a button test once per week to verify alarm operation.
3 LED NOTIFICATIONS: LED lights indicate alarm status, green = normal operation, amber = operating error, red = smoke or carbon monoxide detected & a loud 85-decibel alarm will sound.
TEST & HUSH BUTTON: Makes it easy to test the 5-inch combination detector and silence false alarms, should they occur.
10-YEAR LIMITED WARRANTY: Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that alarms should be replaced.

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Our Best Overall Choice

Best Choice

9.7

First Alert

FIRST ALERT BRK SC9120B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, White, Pack of 3

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Keep your family safe with this 3-pack of hardwired smoke and carbon monoxide alarm; The battery backup means constant monitoring, even if there's a power failure
Features an electrochemical carbon monoxide sensing technology as well as an ionization sensor that detects the fine particles of a fast-burning fire
Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection
Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected
Simple to use, with a single test/silence button, and side-load battery compartment; Tamper-resistant locking brackets and universal mounting brackets make installation easy. Dust cover

Show Price

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