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Smoke & CO Detectors · Head to head

Google Nest Protect (Battery) vs Heiman HS1SA-E Zigbee Smoke Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Updated October 2026
Data from Amazon and official Google and Heiman sites.
2026 verdict
Guarding a bedroom with a spoken early warning, the Google Nest Protect (Battery) is the smoke alarm that tests itself and lights a path.
Google Nest Protect (Battery)
Winner
Google Nest Protect (Battery)
$399.99
Buy on Amazon USACheck price
It also detects carbon monoxide, on six AA cells listed at 2 years, and it joins Google Home. The Heiman HS1SA-E Zigbee Smoke Alarm is the smaller smoke-only sensor, a CR123A listed at 5 years, with automations once a Zigbee hub is in the house. The comparison favors the Google Nest Protect (Battery) on sensing and the safety extras. Buy the Heiman when Zigbee automations and a tiny body matter more than CO.
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FeatureGoogle Nest Protect (Battery)Heiman HS1SA-E Zigbee Smoke AlarmWinner
Price$399.99€34.99Heiman HS1SA-E Zigbee Smoke Alarm
Rating4.44.5Heiman HS1SA-E Zigbee Smoke Alarm
Battery Life2 years5 yearsHeiman HS1SA-E Zigbee Smoke Alarm
Connectivity2.4 GHz WiFi, Bluetooth, OtherZigbeeGoogle Nest Protect (Battery)
IntegrationsGoogle Home, Home AssistantSamsung SmartThings, Home AssistantHeiman HS1SA-E Zigbee Smoke Alarm
SensorsSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionSmokeGoogle Nest Protect (Battery)
AlertsFire Alerts, CO Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsGoogle Nest Protect (Battery)
Tests ItselfYESNOGoogle Nest Protect (Battery)
PathlightYESNOGoogle Nest Protect (Battery)
Steam CheckYESNOGoogle Nest Protect (Battery)
ScreenNONOTie
Built-in SirenYESYESTie

What the differences mean

CO and a voice, or smoke only

The Google Nest Protect (Battery) detects smoke and carbon monoxide, speaks the room, and pushes both alerts to a phone. The Heiman HS1SA-E Zigbee Smoke Alarm detects smoke only. There is no CO sensor and no CO alert, so a boiler still needs another detector.

Two years of AAs or five on a CR123A

The Heiman HS1SA-E Zigbee Smoke Alarm wins the battery-life row: a CR123A listed at 5 years, in a 60 mm body. The Google Nest Protect (Battery) uses six AA cells listed at 2 years, in a 134 mm body. Nest's summary also describes about 10 years before the whole unit expires. Heiman's warranty length is not documented. Nest's warranty is 2 years.

Wi-Fi or a Zigbee hub

The Google Nest Protect (Battery) uses 2.4 GHz Wi-Fi and Bluetooth, lists Google Home and Home Assistant, and links to other Nest Protects over 802.15.4. Alexa, Apple Home, SmartThings and Matter are not supported, and automations are not supported. The Heiman HS1SA-E Zigbee Smoke Alarm needs a Zigbee hub and lists SmartThings, Home Assistant and automations, which is why it wins integrations. Google Home is not documented. Alexa, Apple Home and Matter are not supported.

Pathlight and self-test

The Google Nest Protect (Battery) tests itself, has a pathlight and Steam Check, and senses occupancy, temperature, humidity, light and motion. The Heiman HS1SA-E Zigbee Smoke Alarm has a siren and a light. Pathlight, Steam Check and self-test are no. Owners still call the Heiman siren loud for the size. A decibel figure for the Nest is not in its spec sheet.

Which one to buy if

Winner
Google

Google Nest Protect (Battery)

Prime exclusive deal
$399.99
Buy on Amazon USACheck price
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Other
  • + Sensors: Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion
  • + Alerts: Fire Alerts, CO Alerts, Low Battery Alerts
  • - Price: $399.99 vs €34.99
  • - Rating: 4.4 vs 4.5

What owners say

Owners of both alarms mention a warning that is louder than the housing suggests, and they worry about batteries in different ways. Google Nest Protect (Battery) owners single out the spoken room name, which gives them time to hush a cooking alarm, and phone alerts when they are out, plus Steam Check and a pathlight. They complain about price, a hard stop around 10 years, and the specific lithium AA cells. Heiman HS1SA-E Zigbee Smoke Alarm owners are startled by the siren during tests, like the adhesive pad or screws, and use it in bedrooms, hallways and campervans. They report battery life falling short of a longer claim they expected, and a replacement cell that is hard to find.

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.

  • Google Nest Protect (Battery)
  • Heiman HS1SA-E Zigbee Smoke Alarm

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Frequently Asked Questions

Which smoke alarm should you buy, the Google Nest Protect (Battery) or the Heiman HS1SA-E Zigbee Smoke Alarm?

The Google Nest Protect (Battery), for smoke and carbon monoxide with a spoken warning, self-tests and a pathlight. The Heiman HS1SA-E Zigbee Smoke Alarm is the compact Zigbee smoke sensor with a longer listed battery life and automations, and it does not detect CO.

Does the Google Nest Protect (Battery) have a pathlight?

Yes. The Google Nest Protect (Battery) lists a pathlight, and owners say it can wake light sleepers unless it is turned off for that room. The Heiman HS1SA-E Zigbee Smoke Alarm does not support a pathlight, though it does have a built-in light.

What is the biggest difference between the Google Nest Protect (Battery) and the Heiman HS1SA-E Zigbee Smoke Alarm?

The Google Nest Protect (Battery) is a Wi-Fi smoke and CO alarm that tests itself. The Heiman HS1SA-E Zigbee Smoke Alarm is a smaller Zigbee smoke-only alarm with automations and a CR123A listed at 5 years, against 2 years of AA cells on the Nest.

Does the Heiman HS1SA-E Zigbee Smoke Alarm detect carbon monoxide?

No. CO sensing and CO alerts are not supported. The Google Nest Protect (Battery) detects both smoke and carbon monoxide. Use the Heiman as a smoke sensor only.

Who should buy the Google Nest Protect (Battery)?

Anyone who wants phone alerts, a spoken room name, a pathlight and Steam Check from a battery alarm that also watches for CO. It needs six AA cells and does not join Alexa, Apple Home, SmartThings or Matter.

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

Anyone with a Zigbee hub who wants a discreet smoke alarm for a bedroom, hallway or camper, with SmartThings or Home Assistant automations. Google Home support is not documented, and it is not a CO alarm.

Full comparison table

Compare all 25 Smoke & CO Detectors side by side

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