Updated October 2026
Data from the official Heiman site.
2026 verdict
For most buyers in 2026, Heiman Smoke and CO Alarm HM-636THS is the safer pick over Heiman Interconnected CO Alarm C1-R because of rating, sensors, and alerts.
The main reason it wins is rating, sensors, and alerts, and steam check strengthens that case. Heiman Interconnected CO Alarm C1-R remains a niche alternative if price, connectivity, and integrations matter more than the rest of the comparison. For most setups, Heiman Smoke and CO Alarm HM-636THS is the smarter buy.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
10% OFF
Prime exclusive deal$35.99
$39.99
Join Prime to buy it at $35.99
News by email
Still comparing? Get what's new by email
New releases and the smart home news worth knowing, in your inbox.
No spam. Unsubscribe in one click.
| Feature | Heiman Interconnected CO Alarm C1-R | Heiman Smoke and CO Alarm HM-636THS | Winner |
|---|---|---|---|
| Price | $31.99 | $35.99 | Heiman Interconnected CO Alarm C1-R |
| Rating | 4.1 | 4.4 | Heiman Smoke and CO Alarm HM-636THS |
| Connectivity | 2.4 GHz WiFi, Other | None | Heiman Interconnected CO Alarm C1-R |
| Integrations | Google Home, Samsung SmartThings, Home Assistant | None | Heiman Interconnected CO Alarm C1-R |
| Sensors | CO | Smoke, CO | Heiman Smoke and CO Alarm HM-636THS |
| Alerts | CO Alerts, Low Battery Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Heiman Smoke and CO Alarm HM-636THS |
| Steam Check | NO | YES | Heiman Smoke and CO Alarm HM-636THS |
| Battery Life | 10 years | 10 years | Tie |
| Screen | NO | NO | Tie |
| Built-in Siren | YES | YES | Tie |
| Built-in Light | NO | NO | Tie |
| Tests Itself | YES | YES | Tie |
$31.99
- + Price: $31.99
- + Connectivity: 2.4 GHz WiFi, Other
- + Integrations: Google Home, Samsung SmartThings, Home Assistant
- - Rating: 4.1 vs 4.4
- - Sensors: CO vs Smoke, CO
Winner
10% OFF
Prime exclusive deal$35.99
$39.99
- + Rating: 4.4
- + Sensors: Smoke, CO
- + Alerts: Fire Alerts, CO Alerts, Low Battery Alerts
- - Price: $35.99 vs $31.99
- - Connectivity: None vs 2.4 GHz WiFi, Other
Frequently Asked Questions
Which is better overall: Heiman Interconnected CO Alarm C1-R or Heiman Smoke and CO Alarm HM-636THS?
Heiman Smoke and CO Alarm HM-636THS has the stronger overall profile in this comparison, especially for rating, sensors, and alerts.
What is the biggest difference between Heiman Interconnected CO Alarm C1-R and Heiman Smoke and CO Alarm HM-636THS?
Price is one of the clearest differences: Heiman Interconnected CO Alarm C1-R lists $31.99, while Heiman Smoke and CO Alarm HM-636THS lists $35.99.
Which one looks better on price?
Heiman Interconnected CO Alarm C1-R is listed at $31.99, while Heiman Smoke and CO Alarm HM-636THS is listed at $35.99. Heiman Interconnected CO Alarm C1-R (better spec).
Who should buy Heiman Interconnected CO Alarm C1-R?
Choose Heiman Interconnected CO Alarm C1-R if your priority is price and connectivity and that matters more than rating.
Who should buy Heiman Smoke and CO Alarm HM-636THS?
Choose Heiman Smoke and CO Alarm HM-636THS if your priority is rating and sensors and that matters more than price.
Our store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on AmazonFull comparison table
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
Photoelectric Smoke Alarm
- Smoke & CO Detectors
WiFi Smoke & CO Detector
- Smoke & CO Detectors
Nest Protect (Wired)
- Smoke & CO Detectors
Wi-Fi CO Alarm
- Smoke & CO Detectors
SC07-MR Smart Smoke & CO Alarm
- Smoke & CO Detectors
HS1SA-E Zigbee Smoke Alarm
- Smoke & CO Detectors
Nest Protect (Battery)
- Smoke & CO Detectors
Smart Smoke Detector
- Smoke & CO Detectors
Smoke Alarm
- Smoke & CO Detectors
XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
- Smoke & CO Detectors
Smoke and CO Alarm HM-636THS
- Smoke & CO Detectors
Interconnected Smoke Alarm S1-R
- Smoke & CO Detectors
Smoke Alarm E10
- Smoke & CO Detectors
SD19-MN Interconnected Smart Smoke Alarm
- Smoke & CO Detectors
Matter Smoke Detector S1-TM
- Smoke & CO Detectors
Wi-Fi Smoke Alarm
- Smoke & CO Detectors
Smart Smoke & CO Detector with Ring
- Smoke & CO Detectors
Smoke Alarm HM-636PHS
- Smoke & CO Detectors
Interconnected CO Alarm C1-R
- Smoke & CO Detectors
SC5 Battery Smart Smoke & CO Alarm
- 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