Winner
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Updated October 2026
Data from the official Google and Heiman sites.
2026 verdict
In 2026, the recommendation leans toward Google Nest Protect (Battery) over Heiman Smoke and CO Alarm HM-636THS, driven by connectivity, integrations, and sensors.
What pushes it ahead is connectivity, integrations, and sensors, and Built-in light and pathlight keep the advantage from looking narrow. Heiman Smoke and CO Alarm HM-636THS still makes sense if warranty and battery life are your priority, but most buyers should still lean toward Google Nest Protect (Battery). In practical terms, Google Nest Protect (Battery) is the easier product to recommend.
Works with
Connectivity
- Wi-Fi 2.4 GHz
- Bluetooth
vs
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| Feature | Google Nest Protect (Battery) | Heiman Smoke and CO Alarm HM-636THS | Winner |
|---|---|---|---|
| Warranty | 2 years | 10 years | Heiman Smoke and CO Alarm HM-636THS |
| Battery Life | 2 years | 10 years | Heiman Smoke and CO Alarm HM-636THS |
| Connectivity | 2.4 GHz WiFi, Bluetooth, Other | None | Google Nest Protect (Battery) |
| Integrations | Google Home, Home Assistant | None | Google Nest Protect (Battery) |
| Sensors | Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion | Smoke, CO | Google Nest Protect (Battery) |
| Built-in Light | YES | NO | Google Nest Protect (Battery) |
| Pathlight | YES | NO | Google Nest Protect (Battery) |
| Rating | 4.4 | 4.4 | Tie |
| Screen | NO | NO | Tie |
| Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Tests Itself | YES | YES | Tie |
Winner
Price unavailable right now
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Other
- + Integrations: Google Home, Home Assistant
- + Sensors: Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion
- - Warranty: 2 years vs 10 years
- - Battery Life: 2 years vs 10 years
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Prime exclusive deal$35.99
$39.99
- + Warranty: 10 years
- + Battery Life: 10 years
- - Connectivity: None vs 2.4 GHz WiFi, Bluetooth, Other
- - Integrations: None vs Google Home, Home Assistant
Frequently Asked Questions
Which is better overall: Google Nest Protect (Battery) or Heiman Smoke and CO Alarm HM-636THS?
Google Nest Protect (Battery) has the stronger overall profile in this comparison, especially for connectivity, integrations, and sensors.
What is the biggest difference between Google Nest Protect (Battery) and Heiman Smoke and CO Alarm HM-636THS?
Warranty is one of the clearest differences: Google Nest Protect (Battery) lists 2 years, while Heiman Smoke and CO Alarm HM-636THS lists 10 years.
Who should buy Google Nest Protect (Battery)?
Choose Google Nest Protect (Battery) if your priority is connectivity and integrations and that matters more than warranty.
Who should buy Heiman Smoke and CO Alarm HM-636THS?
Choose Heiman Smoke and CO Alarm HM-636THS if your priority is warranty and battery life and that matters more than connectivity.
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Compare all 27 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.
- 27 Smoke & CO Detectors
- 44 specs compared
- 41 filters
- Smoke & CO Detectors
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SC07-MR Smart Smoke & CO Alarm
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HS1SA-E Zigbee Smoke Alarm
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Nest Protect (Battery)
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Smart Smoke Detector
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Smoke Alarm
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XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
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Smoke and CO Alarm HM-636THS
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Interconnected Smoke Alarm S1-R
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Smoke Alarm E10
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SD19-MN Interconnected Smart Smoke Alarm
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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 HM-636PHS
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Interconnected CO Alarm C1-R
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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 (Battery)
- 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)
- 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
HS1SA-E Zigbee Smoke Alarm
- Smoke & CO Detectors
Interconnected CO Alarm C1-R
- 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