9 Best WiFi Interconnected Smoke Alarms (November 2026)

The best Wi-Fi connected interconnected smoke alarms include the First Alert Hardwire Smoke Alarm with 10-Year for a hardwired smoke alarm network, the SITERWELL Smoke Detector for battery-powered room coverage, and the First Alert Hardwire Combination Smoke & Carbon for linked smoke and CO alerts.

On this page (5 sections)

1. Which WiFi interconnected smoke alarms suit different homes?
2. What should you check before buying a Wi-Fi interconnected alarm?
3. Can hardwired alarms and Wi-Fi alarms work together?
4. Are these the same as alarms that connect to a phone?
5. Which WiFi interconnected smoke alarm should you choose?

The best WiFi interconnected smoke alarms need to do two separate jobs: make linked alarms sound together and send remote notifications over your network. Many interconnected alarms handle the first job but don't provide Wi-Fi alerts, so confirm both functions before choosing a model.

For a basic explanation of what is a smoke alarm, start with the types and functions in our smoke alarm guide. If remote phone notifications matter most, compare these picks with our best smart smoke detectors guide.

Our picks at a glance

1. 1
   Best for a hardwired smoke alarm network

   First Alert Hardwire Smoke Alarm with 10-Year

   9.6/10 our score

   See it on Amazon
2. 2
   Best for battery-powered room coverage

   SITERWELL Smoke Detector

   9.6/10 our score

   See it on Amazon
3. 3
   Best for linked smoke and CO alerts

   First Alert Hardwire Combination Smoke & Carbon

   9.5/10 our score

   See it on Amazon

4. 4

   X-Sense RC01 Pro Remote Controller for Interconnected

   Best for remote control of X-Sense alarms
   Check it
5. 5

   First Alert Smoke Alarm Interconnected Hardwired with 10-Year

   Best for multi-alarm hardwired replacement
   Check it
6. 6

   SITERWELL Smoke Detector

   Best for hardwired photoelectric coverage
   Check it
7. 7

   BRK SC9120B Smoke and Carbon Monoxide Alarm

   Best for BRK and First Alert wired systems
   Check it
8. 8

   X-Sense Smoke Detector Carbon Monoxide Alarm Combo

   Best for standalone smoke and CO detection
   Check it
9. 9

   Heiman Smoke Detector

   Best for wireless alarms that sound together
   Check it

Which WiFi interconnected smoke alarms suit different homes?

The strongest choices here focus on hardwired interconnection, smoke and CO coverage, or wireless alarms that sound together. Only choose a model for remote alerts when its Wi-Fi and app support are stated for that exact model.

We compared the features provided for each alarm against the needs behind “best WiFi interconnected smoke alarms”: linked alerts inside the home and network-based notifications when you’re away.

1

First Alert Hardwire Smoke Alarm with 10-Year: Best for a hardwired smoke alarm network

9.6/10Our score

• Early warning interconnect
• 10-year battery backup
• Alarm indicator identifies the initiating unit

This hardwired First Alert alarm connects with compatible alarms so they can sound together. Its 10-year battery backup helps maintain protection during a power outage.

See it on Amazon

Pros

• 10-year battery backup
• Interconnected alerts
• Identifies the alarm that started the alert

Cons

• No Wi-Fi or phone alerts are specified
• Interconnection is limited to compatible alarms

First Alert’s hardwired smoke alarm is the best fit here for replacing compatible wired units while keeping alarms linked. Its 10-year battery backup helps provide continuous protection during power outages, and the alarm indicator identifies the unit that started the alert.

The early warning interconnect feature means compatible alarms sound when one alarm sounds. That can help make an alert easier to hear elsewhere in the home, but it does not tell you that this model sends a notification over Wi-Fi.

Check the existing alarm’s brand and wiring before you buy. If you need phone alerts as well as linked sound, compare the best smoke detector that alerts your phone and verify that the model’s app supports remote notifications.

Choose this for compatible hardwired interconnection and backup power. It isn’t a fit if direct Wi-Fi notifications are a must-have and you haven’t confirmed that feature.

2

SITERWELL Smoke Detector: Best for battery-powered room coverage

9.6/10Our score

• Photoelectric sensor
• Replaceable 9V battery
• Test and mute button

This battery-powered SITERWELL detector uses a photoelectric sensor and a replaceable 9V battery. Its interconnection and Wi-Fi features are not specified, so confirm those needs before choosing it for a linked system.

See it on Amazon

Pros

• Photoelectric sensing
• Replaceable battery
• Test and mute button

Cons

• Wi-Fi and remote alerts are not specified
• Interconnection is not specified

SITERWELL’s battery-powered detector suits a room where you want photoelectric smoke detection without connecting to household wiring. It uses a replaceable 9V battery and has a test and mute button.

The available product details don’t specify Wi-Fi, phone alerts or alarm-to-alarm interconnection. Treat it as a standalone choice unless SITERWELL confirms that the exact model works with the linked system you need.

The photoelectric sensor is described as more sensitive to slow, smoldering fires. If the main goal is a connected alert on your phone, compare a best Wi-Fi smoke detector and check whether it can also trigger compatible alarms elsewhere in the home.

Choose this for battery-powered photoelectric detection. Don’t rely on it as a Wi-Fi or interconnected alarm without confirming those features for model GS509A.

3

First Alert Hardwire Combination Smoke & Carbon: Best for linked smoke and CO alerts

9.5/10Our score

• Smoke and CO detection
• Early warning interconnect
• Battery backup

This hardwired combination alarm adds carbon monoxide detection to a compatible interconnected system. A battery backup provides continued protection during power outages.

See it on Amazon

Pros

• Detects smoke and CO
• Interconnects with compatible alarms
• Quick Connect Plug

Cons

• Wi-Fi and phone alerts are not specified
• Compatibility matters when joining an existing system

This First Alert combination alarm adds carbon monoxide detection to a compatible hardwired interconnect system. It also has battery backup, so it can continue providing protection during a power outage.

When one compatible alarm sounds, the interconnected alarms sound too. The Quick Connect Plug is designed to make installation easier without rewiring, but you still need to confirm the plug and wiring match your current setup.

Smoke and CO are different hazards, so a combination unit can make sense where you need both kinds of detection. Wi-Fi and phone notifications aren’t specified for this model, so don’t assume that interconnection includes remote alerts.

Choose it for smoke and CO coverage across a compatible wired system. For a phone alert, confirm network and app support separately.

4

X-Sense RC01 Pro Remote Controller for Interconnected: Best for remote control of X-Sense alarms

9.4/10Our score

• Tests or silences compatible alarms
• Helps locate the source alarm
• Replaceable lithium battery

The RC01 Pro controls compatible X-Sense interconnected alarms from within reach, which can help in homes with high ceilings. It is a remote controller, not a Wi-Fi bridge or phone alert device.

See it on Amazon

Pros

• Test and silence from within reach
• Can help locate the source alarm
• Replaceable battery

Cons

• Works only with specified X-Sense models
• Does not provide Wi-Fi or phone alerts

The X-Sense RC01 Pro is a remote controller for selected X-Sense interconnected alarms. It lets you test or silence compatible units from within reach, which can be useful when an alarm is mounted high or on another level.

When an alert starts, the remote can silence other compatible units while the source alarm continues sounding. That helps you find where the alarm began, but the controller does not provide a phone notification or connect the alarms to Wi-Fi.

Compatibility is specific: the RC01 Pro works with listed X-Sense models, including SD19-W, SD20-W, SC01-W, SC06-W, SC07-W and XP0H-WN. Check your alarm model before buying, especially if you’re building a system around a different brand.

Choose it to control compatible X-Sense alarms from within reach. It’s an accessory, not a smoke alarm or a Wi-Fi bridge.

5

First Alert Smoke Alarm Interconnected Hardwired with 10-Year: Best for multi-alarm hardwired replacement

9.3/10Our score

• Hardwired interconnect
• 10-year battery backup
• Alarm indicator identifies the initiating unit

This six-alarm First Alert set is aimed at replacing or adding multiple compatible hardwired alarms. The 10-year battery backup supports operation during power outages.

See it on Amazon

Pros

• Six alarms in the pack
• 10-year battery backup
• Identifies the unit that initiated the alarm

Cons

• Wi-Fi and remote alerts are not specified
• Check wiring and alarm compatibility first

This six-alarm First Alert set suits a home replacing several compatible hardwired smoke alarms at once. Its 10-year battery backup helps keep each alarm operating during a power outage.

Like the other First Alert hardwired pick, this model uses early warning interconnect so compatible units sound together. The alarm indicator identifies which unit initiated an alert, helping you track the source.

The product name describes a six-pack, but confirm the wiring and compatibility for each location before installation. No Wi-Fi or phone-notification feature is specified, so this is a linked-alarm option rather than a confirmed remote-alert system.

Choose it when you need multiple compatible hardwired smoke alarms with backup power. Look elsewhere if you need app alerts and cannot confirm that function for the exact model.

6

SITERWELL Smoke Detector: Best for hardwired photoelectric coverage

9.2/10Our score

• Photoelectric sensor
• Hardwired interconnect
• Replaceable 9V backup battery

This SITERWELL model supports hardwired interconnection among up to 12 detectors, with a replaceable 9V backup battery. The product details do not specify Wi-Fi or phone notifications.

See it on Amazon

Pros

• Photoelectric sensor
• Interconnects up to 12 detectors
• Backup battery

Cons

• Wi-Fi alerts are not specified
• Confirm wiring compatibility before installation

SITERWELL’s hardwired detector uses a photoelectric sensor and supports interconnection with up to 12 smoke detectors. A replaceable 9V battery provides backup during power outages.

When one interconnected unit triggers, the linked detectors sound together. That gives you a coordinated in-home alert, while the available product details do not specify an internet connection or phone notifications.

This model may suit a home that wants photoelectric detection across a wired system. Confirm compatibility with your existing alarms and wiring before installing it, and check local requirements for alarm placement and installation.

Choose it for hardwired photoelectric coverage across up to 12 detectors. If you also need a remote notification, confirm that separately rather than treating interconnection as Wi-Fi.

7

BRK SC9120B Smoke and Carbon Monoxide Alarm: Best for BRK and First Alert wired systems

9.1/10Our score

• Smoke and CO detection
• Interconnects with BRK and First Alert hardwired alarms
• Separate smoke and CO indicators

The BRK SC9120B combines smoke and carbon monoxide detection and can interconnect with BRK and First Alert hardwired alarms. Its separate indicators help show which hazard triggered the alarm.

See it on Amazon

Pros

• Detects smoke and CO
• Compatible with specified hardwired alarm brands
• Separate hazard indicators

Cons

• Wi-Fi and remote alerts are not specified
• Check compatibility with the existing system

BRK’s SC9120B combines smoke and carbon monoxide detection and interconnects with BRK and First Alert hardwired alarms. Separate smoke and CO latching indicators help show which hazard triggered the alarm.

The model has a 9V battery and a test/silence button. Its interconnection is designed for compatible hardwired alarms, so check the exact system and wiring before using it as a replacement.

The product details don’t specify Wi-Fi or phone alerts. If your priority is an alert when you’re away, consider a smart smoke detector hardwired option and confirm both wiring compatibility and app support.

Choose it for smoke and CO detection in a compatible BRK or First Alert wired system. It isn’t a confirmed remote-notification alarm.

8

X-Sense Smoke Detector Carbon Monoxide Alarm Combo: Best for standalone smoke and CO detection

8.9/10Our score

• Smoke and CO sensors
• 10-year sealed battery
• LCD displays CO levels and battery life

This X-Sense combination alarm is a standalone unit with a sealed 10-year battery and an LCD for CO levels and battery life. It does not support Wi-Fi or wireless interconnection.

See it on Amazon

Pros

• Detects smoke and CO
• Sealed 10-year battery
• LCD shows CO levels and battery life

Cons

• Does not interconnect wirelessly
• Does not provide Wi-Fi alerts

This X-Sense combination unit detects smoke and carbon monoxide, displays CO levels and battery life, and runs on a sealed 10-year battery. It’s a standalone model.

The distinction matters for this roundup: the XP0H-SN does not support wireless interconnection, Wi-Fi or a base station. X-Sense identifies the XP0H-WN as the interconnected version, so check the full model name if you want alarms to communicate.

A standalone unit can still be useful for a location where combination detection and a long-life battery are the main priorities. It won’t provide the linked or remote alerts that define a Wi-Fi interconnected system.

Choose it for standalone smoke and CO coverage with an LCD. Skip this model if you need Wi-Fi alerts or interconnection.

9

Heiman Smoke Detector: Best for wireless alarms that sound together

8.4/10Our score

• Wireless alarm-to-alarm connection
• Photoelectric sensor
• Battery powered

These Heiman alarms communicate wirelessly with one another, so linked units can sound together when one detects smoke. They do not connect directly to Wi-Fi or a smartphone app.

See it on Amazon

Pros

• Wireless alarms sound together
• Battery powered with no wiring required
• Photoelectric sensing

Cons

• No direct Wi-Fi or app connection
• Wireless range is stated for open areas

Heiman’s three-pack provides wireless interconnection between alarms. When one detects smoke, the linked units sound together, with a stated range of up to 656 ft in open areas.

These alarms do not connect directly to Wi-Fi or a smartphone app. The wireless link coordinates alarms within the home; it doesn’t provide the network-based remote notifications some buyers expect from Wi-Fi models.

The alarms are battery powered, so they don’t require direct wiring. Heiman describes dual-photoelectric detection and a test/silence button, while the wireless range is stated for open areas and may not reflect every home’s layout.

Choose this for wireless alarm-to-alarm alerts without wiring. If phone alerts are essential, choose a model that explicitly supports Wi-Fi and app notifications.

What should you check before buying a Wi-Fi interconnected alarm?

Check whether the alarm supports both interconnection and remote notifications, because those are separate features. A wireless alarm can communicate with other alarms over radio without connecting to your home network.

Look for clear Wi-Fi or app support, then confirm whether the app can send alerts when you’re away from home. Also check whether the alarms connect directly to Wi-Fi or need a hub, base station or compatible system.

For a hardwired replacement, match the existing wiring and interconnect requirements. A photoelectric smoke detector with base may help if your decision also depends on the alarm’s sensor type or mounting setup.

Can hardwired alarms and Wi-Fi alarms work together?

Some hardwired alarms interconnect with compatible units, but compatibility depends on the brand and model. Don’t assume that two alarms can share wiring or communicate just because both are hardwired.

Before mixing brands, check the manufacturer’s compatibility information for the exact models. If you’re replacing a Kidde alarm, our Kidde smoke detector comparison can help you narrow the options before checking the wiring requirements.

Are these the same as alarms that connect to a phone?

No. An alarm that alerts your phone needs network-based remote notification support, while an interconnected alarm makes other compatible units sound in the home.

A model can offer one feature without the other.

Choose based on where you need the alert to reach. If you’re home and need to hear an alarm across rooms, interconnection may address that need; if you want updates while away, confirm Wi-Fi and app support for the exact model.

Which WiFi interconnected smoke alarm should you choose?

Choose the First Alert hardwired alarm for a compatible wired system with a 10-year battery backup, or the First Alert combination model if you also want CO detection. Consider Heiman if wireless alarms that sound together are enough without Wi-Fi.

For remote alerts, pick only a model that explicitly confirms Wi-Fi and app notifications. Compare the radon monitors with alarm system guide separately if you’re also planning alerts for a different household hazard.

Our top 3 picks at a glance

1. 1
   Best for a hardwired smoke alarm network

   First Alert Hardwire Smoke Alarm with 10-Year

   9.6/10 our score

   See it on Amazon
2. 2
   Best for battery-powered room coverage

   SITERWELL Smoke Detector

   9.6/10 our score

   See it on Amazon
3. 3
   Best for linked smoke and CO alerts

   First Alert Hardwire Combination Smoke & Carbon

   9.5/10 our score

   See it on Amazon

Frequently asked questions

Do interconnected smoke alarms need Wi-Fi?

No. Interconnected alarms can communicate by wiring or a dedicated wireless link, so they sound together without using home Wi-Fi.

Wi-Fi is needed for network-based phone notifications.

Check for explicit app or remote-alert support if you want to know about an alarm while away.

Can hardwired smoke alarms send phone alerts?

Hardwired alarms can sound together without sending phone alerts. Remote notifications require a compatible Wi-Fi alarm or system that connects to an app.

Before replacing a wired alarm, check the wiring, interconnect compatibility and whether the exact model supports remote alerts.

Are wireless interconnected alarms the same as Wi-Fi alarms?

No. Wireless interconnected alarms use a radio link to alert other alarms in the home.

A Wi-Fi alarm connects to a home network and may send notifications to a phone.

Heiman’s wireless set links alarms together but does not connect directly to Wi-Fi or an app.

How do I choose an alarm for an existing wired system?

Match the replacement to the existing system’s wiring and interconnection requirements. First Alert and BRK describe compatibility with specified hardwired alarms, while other brands may use different connections.

Check the exact model and wiring before buying, and consult a qualified installer if you’re unsure.