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Smoke & CO Detectors · Head to head

First Alert SMCO410 Smoke Detector & CO Alarm vs Heiman HS1SA-E Zigbee Smoke Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Updated September 2026
Data from Amazon and official First Alert and Heiman sites.
2026 verdict
Only one of these is a carbon monoxide alarm too, and that decides it: the First Alert SMCO410 Smoke Detector & CO Alarm is the safer buy over the Heiman HS1SA-E Zigbee Smoke Alarm.
First Alert SMCO410 Smoke Detector & CO Alarm
Winner
First Alert SMCO410 Smoke Detector & CO Alarm
$55.99$64.9814% OFF
Buy on Amazon USACheck price
It detects smoke and CO, sends CO alerts, has steam check for cooking nuisance alarms and runs about 10 years on a sealed lithium battery against about 5 years on a CR123A. The Heiman HS1SA-E Zigbee Smoke Alarm is the lower priced of the pair, is better reviewed by its owners, adds a built-in light and is tiny, at 67 g and 60 mm across. Both need a hub, a Z-Wave one for the First Alert and a Zigbee one for the Heiman, and both work with SmartThings and Home Assistant. Choose the First Alert SMCO410 Smoke Detector & CO Alarm for a Z-Wave home that wants CO covered, and the Heiman HS1SA-E Zigbee Smoke Alarm for a discreet, cheap Zigbee smoke sensor.
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FeatureFirst Alert SMCO410 Smoke Detector & CO AlarmHeiman HS1SA-E Zigbee Smoke AlarmWinner
Price$55.99€34.99Heiman HS1SA-E Zigbee Smoke Alarm
Rating3.54.5Heiman HS1SA-E Zigbee Smoke Alarm
Battery Life10 years5 yearsFirst Alert SMCO410 Smoke Detector & CO Alarm
SensorsSmoke, COSmokeFirst Alert SMCO410 Smoke Detector & CO Alarm
AlertsFire Alerts, CO Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsFirst Alert SMCO410 Smoke Detector & CO Alarm
Built-in LightNOYESHeiman HS1SA-E Zigbee Smoke Alarm
Steam CheckYESNOFirst Alert SMCO410 Smoke Detector & CO Alarm
ConnectivityZ-WaveZigbeeTie
IntegrationsSamsung SmartThings, Home AssistantSamsung SmartThings, Home AssistantTie
ScreenNONOTie
Built-in SirenYESYESTie
Tests ItselfNONOTie

What the differences mean

Carbon monoxide

The First Alert SMCO410 Smoke Detector & CO Alarm has both a smoke and a CO sensor, with fire and CO alerts. The Heiman HS1SA-E Zigbee Smoke Alarm senses smoke only, so a home with gas appliances needs a separate CO detector.

Battery

The First Alert SMCO410 Smoke Detector & CO Alarm has a sealed lithium battery rated for 10 years and cannot be replaced, so the whole unit goes at end of life. The Heiman HS1SA-E Zigbee Smoke Alarm has a replaceable CR123A rated for 5 years, which is easier to service but shorter.

Size and light

The Heiman HS1SA-E Zigbee Smoke Alarm weighs 67 g in a 60 mm case and adds a built-in light. The First Alert SMCO410 Smoke Detector & CO Alarm is a 127 mm, 280 g unit with no light.

Hub and radio

The First Alert SMCO410 Smoke Detector & CO Alarm speaks Z-Wave and the Heiman HS1SA-E Zigbee Smoke Alarm speaks Zigbee. Pick the one that matches the hub you already have, since neither has Wi-Fi.

Which one to buy if

What owners say

Heiman HS1SA-E Zigbee Smoke Alarm owners are mostly struck by how loud the siren is for such a small unit, over 85 dB by its spec, and by how painless it is to mount with screws or the included adhesive pad. They like its discreet look, the blinking status light that confirms it is working and a low-battery warning that arrives before it goes silent. Their recurring complaints are practical: battery life that falls short of the rating for some, replacement cells that are hard to find in the exact type, an adhesive mount that loosens with vibration for a few, and the need for a Zigbee hub to get smart alerts. It is described as a good fit for bedrooms, hallways and campervans.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • First Alert SMCO410 Smoke Detector & CO Alarm
  • Heiman HS1SA-E Zigbee Smoke Alarm

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Frequently Asked Questions

Which is better overall: First Alert SMCO410 Smoke Detector & CO Alarm or Heiman HS1SA-E Zigbee Smoke Alarm?

The First Alert SMCO410 Smoke Detector & CO Alarm, because it adds carbon monoxide detection and a battery rated for 10 years. The Heiman HS1SA-E Zigbee Smoke Alarm is the lower priced, smaller and better reviewed smoke-only option.

What is the biggest difference between the First Alert SMCO410 Smoke Detector & CO Alarm and the Heiman HS1SA-E Zigbee Smoke Alarm?

Carbon monoxide detection and the radio. The First Alert SMCO410 Smoke Detector & CO Alarm senses CO and uses Z-Wave, while the Heiman HS1SA-E Zigbee Smoke Alarm senses smoke only and uses Zigbee.

Does the Heiman HS1SA-E Zigbee Smoke Alarm work with SmartThings and Home Assistant?

Yes, through a Zigbee hub. The First Alert SMCO410 Smoke Detector & CO Alarm also works with SmartThings and Home Assistant, over Z-Wave.

Can I replace the battery in the First Alert SMCO410 Smoke Detector & CO Alarm?

No, it is sealed and rated for 10 years, after which the whole unit is replaced. The Heiman HS1SA-E Zigbee Smoke Alarm uses a replaceable CR123A rated for 5 years.

Who should buy the First Alert SMCO410 Smoke Detector & CO Alarm?

Z-Wave and Ring Alarm homes that want smoke and CO in one alarm, low maintenance for a decade and alerts inside their automations.

Who should buy the Heiman HS1SA-E Zigbee Smoke Alarm?

Zigbee smart home owners who want a small, discreet and affordable smoke sensor for bedrooms, hallways or a campervan and will handle battery upkeep.

Full comparison table

Compare all 24 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.

  • 24 Smoke & CO Detectors
  • 44 specs compared
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