Winner
Price unavailable right now
Updated November 2026
Data from the official Google and Heiman sites.
2026 verdict
For most buyers in 2026, Google Nest Protect (Battery) is the safer pick over Heiman Interconnected CO Alarm C1-R because of rating, connectivity, and sensors.
Its strongest advantages show up in rating, connectivity, and sensors, with alerts and Built-in light helping widen the gap. Heiman Interconnected CO Alarm C1-R can still be the right pick, but only if battery life and integrations outweigh the wider strengths of Google Nest Protect (Battery). Overall, Google Nest Protect (Battery) makes more sense for most people.
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| Feature | Google Nest Protect (Battery) | Heiman Interconnected CO Alarm C1-R | Winner |
|---|---|---|---|
| Rating | 4.4 | 4.2 | Google Nest Protect (Battery) |
| Battery Life | 2 years | 10 years | Heiman Interconnected CO Alarm C1-R |
| Connectivity | 2.4 GHz WiFi, Bluetooth, Other | 2.4 GHz WiFi, Other | Google Nest Protect (Battery) |
| Integrations | Google Home, Home Assistant | Google Home, Samsung SmartThings, Home Assistant | Heiman Interconnected CO Alarm C1-R |
| Sensors | Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion | CO | Google Nest Protect (Battery) |
| Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | CO Alerts, Low Battery Alerts | Google Nest Protect (Battery) |
| Built-in Light | YES | NO | Google Nest Protect (Battery) |
| Pathlight | YES | NO | Google Nest Protect (Battery) |
| Steam Check | YES | NO | Google Nest Protect (Battery) |
| Screen | NO | NO | Tie |
| Built-in Siren | YES | YES | Tie |
| Tests Itself | YES | YES | Tie |
Winner
Price unavailable right now
- + Rating: 4.4
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Other
- + Sensors: Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion
- - Battery Life: 2 years vs 10 years
- - Integrations: Google Home, Home Assistant vs Google Home, Samsung SmartThings, Home Assistant
$31.97
- + Battery Life: 10 years
- + Integrations: Google Home, Samsung SmartThings, Home Assistant
- - Rating: 4.2 vs 4.4
- - Connectivity: 2.4 GHz WiFi, Other vs 2.4 GHz WiFi, Bluetooth, Other
Frequently Asked Questions
Which is better overall: Google Nest Protect (Battery) or Heiman Interconnected CO Alarm C1-R?
Google Nest Protect (Battery) has the stronger overall profile in this comparison, especially for rating, connectivity, and sensors.
What is the biggest difference between Google Nest Protect (Battery) and Heiman Interconnected CO Alarm C1-R?
Rating is one of the clearest differences: Google Nest Protect (Battery) lists 4.4, while Heiman Interconnected CO Alarm C1-R lists 4.2.
Who should buy Google Nest Protect (Battery)?
Choose Google Nest Protect (Battery) if your priority is rating and connectivity and that matters more than battery life.
Who should buy Heiman Interconnected CO Alarm C1-R?
Choose Heiman Interconnected CO Alarm C1-R if your priority is battery life and integrations and that matters more than rating.
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Compare all 28 Smoke & CO Detectors side by side
You are looking at two of them. The full table lines up all Smoke & CO Detectors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 28 Smoke & CO Detectors
- 45 specs compared
- 42 filters
- Smoke & CO Detectors
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HS1SA-E Zigbee Smoke Alarm
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SD19-MN Interconnected Smart Smoke Alarm
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Smart Smoke Detector
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Carbon Monoxide Detector C1-S
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Smoke and CO Alarm HM-636THS
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Matter Smoke Detector S1-TM
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Wi-Fi Smoke Alarm
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Smart Smoke & CO Detector with Ring
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Smoke Alarm E10
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Smoke Alarm HM-636PHS
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Interconnected Smoke Alarm S1-R
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SMCO410 Smoke Detector & CO Alarm
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SC5 Battery Smart Smoke & CO Alarm
- Cameras
Nest Cam (outdoor or indoor, battery)
- Cameras
Nest Cam Floodlight
- Cameras
Nest Cam Indoor (Wired, 3rd Gen)
- Cameras
Nest Cam Outdoor (Wired, 2nd Gen)
- Cameras
Nest Cam (indoor, wired)
- Displays
Nest Hub (2nd Gen)
- Displays
Nest Hub Max
- Doorbells
Nest Doorbell (battery)
- Doorbells
Nest Doorbell (wired, 3rd Gen)
- Doorbells
Nest Doorbell (wired, 2nd Gen)
- Door Locks
Nest x Yale Lock
- Routers
Nest WiFi Pro
- Smoke & CO Detectors
Nest Protect (Wired)
- Speakers
Nest Audio
- Speakers
Nest Mini (2nd gen)
- Streaming Devices
TV Streamer (4K)
- Temperature & Humidity Sensors
Nest Temperature Sensor (2nd gen)
- Temperature & Humidity Sensors
Nest Temperature Sensor
- Thermostats
Nest Learning Thermostat (4th gen)
- Thermostats
Nest Learning Thermostat
- Door & Window Sensors
Window Door Alarm
- Gas Detectors
HS1CG Series Combustible Gas Sensor
- Gas Detectors
WS2CG Series Combustible Gas Detector
- Motion Sensors
Smart Motion Sensor
- Motion Sensors
WiFi Smart Motion Sensor
- Sirens
Smart Siren HS2WD series
- Smoke & CO Detectors
Carbon Monoxide Detector C1-S
- Smoke & CO Detectors
HS1SA-E Zigbee Smoke Alarm
- Smoke & CO Detectors
Interconnected Smoke Alarm S1-R
- Smoke & CO Detectors
Matter Smoke Detector S1-M
- Smoke & CO Detectors
Matter Smoke Detector S1-TM
- Smoke & CO Detectors
Smart CO Alarm
- Smoke & CO Detectors
Smoke Alarm HM-636PHS
- Smoke & CO Detectors
Smoke and CO Alarm HM-636THS
- Vibration Sensors
Smart Vibration Sensor HS1VS series
- Water Leak Sensors
Smart Water Leakage Sensor