17% OFF
Prime exclusive deal$24.99
$29.99
Join Prime to buy it at $24.99
Updated October 2026
Data from the official Heiman and X-Sense sites.
2026 verdict
In 2026, the recommendation leans toward X-Sense Wi-Fi Carbon Monoxide Alarm over Heiman Smoke Alarm HM-636PHS, driven by rating, connectivity, and integrations.
It has the clearer edge on rating, connectivity, and integrations, and it stays ahead on screen and Built-in light. You should still consider Heiman Smoke Alarm HM-636PHS if price, warranty, and battery life matter more than raw overall balance. Overall, X-Sense Wi-Fi Carbon Monoxide Alarm makes more sense for most people.
vs
Winner
Works with
Connectivity
- Wi-Fi 2.4 GHz
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 Smoke Alarm HM-636PHS | X-Sense Wi-Fi Carbon Monoxide Alarm | Winner |
|---|---|---|---|
| Price | $24.99 | £30.59 | Heiman Smoke Alarm HM-636PHS |
| Rating | 4.2 | 4.6 | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Warranty | 10 years | 5 years | Heiman Smoke Alarm HM-636PHS |
| Battery Life | 10 years | 1 year | Heiman Smoke Alarm HM-636PHS |
| Connectivity | None | 2.4 GHz WiFi | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Integrations | None | Home Assistant | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Screen | NO | YES | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Built-in Light | NO | YES | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Tests Itself | YES | NO | Heiman Smoke Alarm HM-636PHS |
| Steam Check | YES | NO | Heiman Smoke Alarm HM-636PHS |
| Sensors | Smoke | CO | Tie |
| Alerts | Fire Alerts, Low Battery Alerts | CO Alerts, Low Battery Alerts | Tie |
17% OFF
Prime exclusive deal$24.99
$29.99
- + Price: $24.99
- + Warranty: 10 years
- + Battery Life: 10 years
- - Rating: 4.2 vs 4.6
- - Connectivity: None vs 2.4 GHz WiFi
Winner
15% OFF
£30.59
£35.99
- + Rating: 4.6
- + Connectivity: 2.4 GHz WiFi
- + Integrations: Home Assistant
- - Price: £30.59 vs $24.99
- - Warranty: 5 years vs 10 years
Frequently Asked Questions
Which is better overall: Heiman Smoke Alarm HM-636PHS or X-Sense Wi-Fi Carbon Monoxide Alarm?
X-Sense Wi-Fi Carbon Monoxide Alarm has the stronger overall profile in this comparison, especially for rating, connectivity, and integrations.
What is the biggest difference between Heiman Smoke Alarm HM-636PHS and X-Sense Wi-Fi Carbon Monoxide Alarm?
Price is one of the clearest differences: Heiman Smoke Alarm HM-636PHS lists $24.99, while X-Sense Wi-Fi Carbon Monoxide Alarm lists £30.59.
Which one looks better on price?
Heiman Smoke Alarm HM-636PHS is listed at $24.99, while X-Sense Wi-Fi Carbon Monoxide Alarm is listed at £30.59. Heiman Smoke Alarm HM-636PHS (better spec).
Who should buy Heiman Smoke Alarm HM-636PHS?
Choose Heiman Smoke Alarm HM-636PHS if your priority is price and warranty and that matters more than rating.
Who should buy X-Sense Wi-Fi Carbon Monoxide Alarm?
Choose X-Sense Wi-Fi Carbon Monoxide Alarm if your priority is rating and connectivity 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
- Air Quality Monitors
XR0A-iR Wi-Fi Radon Detector
- Hubs
SBS50 Base Station
- Motion Sensors
Solar Outdoor Spotlight - Motion-Sensor
- Smoke & CO Detectors
SC07-MR Smart Smoke & CO Alarm
- Smoke & CO Detectors
SD19-MN Interconnected Smart Smoke Alarm
- Smoke & CO Detectors
Wi-Fi CO Alarm
- Smoke & CO Detectors
Wi-Fi Smoke Alarm
- Smoke & CO Detectors
WiFi Smoke & CO Detector
- Smoke & CO Detectors
XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
- Smoke & CO Detectors
XP0J-iA Smart Hardwired Smoke & CO Alarm
- Temperature & Humidity Sensors
Smart WiFi Indoor Thermometer
- Temperature & Humidity Sensors
STH0B Smart Thermometer Hygrometer
- Water Leak Sensors
2-in-1 Wi-Fi Water Leak & Freeze Detector
- Water Leak Sensors
Wi-Fi Water Leak Detector