Updated November 2026
Data from the official Heiman and X-Sense sites.
2026 verdict
Between X-Sense Wi-Fi Carbon Monoxide Alarm and Heiman Carbon Monoxide Detector C1-S, X-Sense Wi-Fi Carbon Monoxide Alarm is the better overall pick in 2026, leading on rating, connectivity, and integrations.
It builds its lead on rating, connectivity, and integrations, then backs it up with a stronger showing on screen and Built-in light. The only strong reason to choose Heiman Carbon Monoxide Detector C1-S is if price, warranty, and battery life are more important to you than the overall verdict. Overall, X-Sense Wi-Fi Carbon Monoxide Alarm makes more sense for most people.
vs
Winner
Works with
Connectivity
- Wi-Fi 2.4 GHz
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The biggest differences
Where these two are furthest apart, and by how much.
- Battery Life10×Heiman Carbon Monoxide Detector C1-S10 years vs 1 year
- Warranty2×Heiman Carbon Monoxide Detector C1-S10 years vs 5 years
| Feature | Heiman Carbon Monoxide Detector C1-S | X-Sense Wi-Fi Carbon Monoxide Alarm | Winner |
|---|---|---|---|
| Price | $29.99 | £35.99 | Heiman Carbon Monoxide Detector C1-S |
| Rating | 4.4 | 4.6 | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Warranty | 10 years | 5 years | Heiman Carbon Monoxide Detector C1-S |
| Battery Life | 10 years | 1 year | Heiman Carbon Monoxide Detector C1-S |
| 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 |
| Sensors | CO | CO | Tie |
| Alerts | CO Alerts, Low Battery Alerts | CO Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
$29.99
- + Price: $29.99
- + Warranty: 10 years
- + Battery Life: 10 years
- - Rating: 4.4 vs 4.6
- - Connectivity: None vs 2.4 GHz WiFi
Winner
£35.99
- + Rating: 4.6
- + Connectivity: 2.4 GHz WiFi
- + Integrations: Home Assistant
- - Price: £35.99 vs $29.99
- - Warranty: 5 years vs 10 years
Frequently Asked Questions
Which is better overall: Heiman Carbon Monoxide Detector C1-S 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 Carbon Monoxide Detector C1-S and X-Sense Wi-Fi Carbon Monoxide Alarm?
Price is one of the clearest differences: Heiman Carbon Monoxide Detector C1-S lists $29.99, while X-Sense Wi-Fi Carbon Monoxide Alarm lists £35.99.
Which one looks better on price?
Heiman Carbon Monoxide Detector C1-S is listed at $29.99, while X-Sense Wi-Fi Carbon Monoxide Alarm is listed at £35.99. Heiman Carbon Monoxide Detector C1-S (better spec).
Who should buy Heiman Carbon Monoxide Detector C1-S?
Choose Heiman Carbon Monoxide Detector C1-S 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.
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