Winner
Updated October 2026
Data from the official Heiman and X-Sense sites.
2026 verdict
Covering smoke in a bedroom or hallway with a sensor that runs for years, the Heiman HS1SA-E Zigbee Smoke Alarm is the better buy of these two alarms, even though the pair guards different hazards.
It is smoke only, but it lasts about five years on a CR123A cell and joins a Zigbee network for Home Assistant and Samsung SmartThings, where it can drive automations, and its over-85 dB siren is famously loud for a 67 g body. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts covers the other hazard, carbon monoxide, and adds temperature and humidity sensing plus a backlit LCD, but it is a closed system with no documented smart home platform and roughly a one-year battery. Buy the Heiman HS1SA-E Zigbee Smoke Alarm as a discreet, connected smoke sensor with long battery life, and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts if carbon monoxide is the risk you need to cover.
Works with
Connectivity
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Connectivity
- Wi-Fi 2.4 GHz
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| Feature | Heiman HS1SA-E Zigbee Smoke Alarm | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts | Winner |
|---|---|---|---|
| Price | £32.99 | £27.71 | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts |
| Rating | 4.6 | 4.4 | Heiman HS1SA-E Zigbee Smoke Alarm |
| Battery Life | 5 years | 1 year | Heiman HS1SA-E Zigbee Smoke Alarm |
| Integrations | Samsung SmartThings, Home Assistant | None | Heiman HS1SA-E Zigbee Smoke Alarm |
| Screen | NO | YES | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts |
| Sensors | Smoke | CO, Temperature, Humidity | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts |
| Built-in Light | YES | NO | Heiman HS1SA-E Zigbee Smoke Alarm |
| Local Control | YES | Partially | Heiman HS1SA-E Zigbee Smoke Alarm |
| Connectivity | Zigbee | 2.4 GHz WiFi | Tie |
| Alerts | Fire Alerts, Low Battery Alerts | CO Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
What the differences mean
Hazards covered
The Heiman HS1SA-E Zigbee Smoke Alarm detects smoke and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts detects carbon monoxide. Neither covers the other hazard, so the right pick depends on the risk you are guarding against.
Battery life
The Heiman HS1SA-E Zigbee Smoke Alarm is rated around five years on a CR123A cell, against roughly one year for the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts on the same cell type.
Smart home reach
The Heiman HS1SA-E Zigbee Smoke Alarm joins Home Assistant and Samsung SmartThings through a Zigbee hub and supports automations. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts has no documented smart home platform, though it reaches its own app over Wi-Fi.
Readout on the device
The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts has a backlit LCD showing the live CO reading, temperature and humidity. The Heiman HS1SA-E Zigbee Smoke Alarm has no screen, only a status light.
Sensors beyond the alarm
Beyond carbon monoxide, the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts measures temperature and humidity. The Heiman HS1SA-E Zigbee Smoke Alarm senses smoke alone.
Siren
Both have a built-in siren above 85 dB and both signal a low battery, so loudness is not the deciding factor here.
Which one to buy if
- you need a smoke alarm
The Heiman HS1SA-E Zigbee Smoke Alarm is the smoke detector of the pair.
- you need carbon monoxide protection for a gas boiler or attached garage
The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts covers CO, which the Heiman does not.
- your smart home runs on Home Assistant or SmartThings
The Heiman HS1SA-E Zigbee Smoke Alarm joins a Zigbee network, while the X-Sense has no documented platform support.
- you want to read the CO level and room climate on the device
Its backlit LCD shows live CO, temperature and humidity.
- you want the longest time between battery changes
About five years on a CR123A cell against roughly one year for the X-Sense.
Winner
£32.99
- + Rating: 4.6
- + Battery Life: 5 years
- + Integrations: Samsung SmartThings, Home Assistant
- - Price: £32.99 vs £27.71
- - Screen: NO vs YES
16% OFF
£27.71
£32.99
- + Price: £27.71
- + Screen: YES
- + Sensors: CO, Temperature, Humidity
- - Rating: 4.4 vs 4.6
- - Battery Life: 1 year vs 5 years
What owners say
Owners of both alarms value how little attention they demand, and both groups mention a quick, tool-light install. Heiman HS1SA-E Zigbee Smoke Alarm owners cannot get over how loud it is for its size, describing it catching real cooking smoke, and they like that a Zigbee hub turns it into a smart sensor for Home Assistant or SmartThings with low-battery alerts; their complaints are a battery that can fall short of the rated years and a replacement cell that is hard to source. X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts owners talk about a setup that takes minutes, spoken voice alerts that announce the location, and the live CO, temperature and humidity readings on the LCD; they caution that it is carbon monoxide only, that it does not interconnect with other alarms, and that the in-app climate figures lag behind the display.
Frequently Asked Questions
Which is better overall: Heiman HS1SA-E Zigbee Smoke Alarm or X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts?
The Heiman HS1SA-E Zigbee Smoke Alarm, for a combined edge in battery life and smart home support. It is rated around five years on a CR123A cell and joins Home Assistant and Samsung SmartThings through a Zigbee hub. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts covers carbon monoxide instead and adds an LCD. They guard different hazards, so the right one depends on the risk.
What is the biggest difference between the Heiman HS1SA-E Zigbee Smoke Alarm and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts?
The hazard. The Heiman HS1SA-E Zigbee Smoke Alarm senses smoke and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts senses carbon monoxide, so neither replaces the other and most homes will want one of each.
Does the Heiman HS1SA-E Zigbee Smoke Alarm detect carbon monoxide?
No. It is a smoke-only alarm with a photoelectric sensor and no CO sensor, so a gas appliance, boiler or garage still needs a separate carbon monoxide alarm.
Does the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts detect smoke?
No. It is a dedicated carbon monoxide alarm, so it should be paired with a smoke alarm rather than replace one.
Do these alarms work with Alexa or Google Home?
No. The Heiman HS1SA-E Zigbee Smoke Alarm works with Home Assistant and Samsung SmartThings through a Zigbee hub, and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts has no documented smart home platform. Neither supports Alexa, Google Home, Apple HomeKit or Matter.
Who should buy the Heiman HS1SA-E Zigbee Smoke Alarm?
A buyer who wants a discreet smoke sensor that lasts years and feeds a Zigbee smart home, rather than a combined smoke and CO alarm.
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