Live nowPrime Day 2026October 6 to 7, 2026Starts in--d--h--m--sSee the deals
Smoke & CO Detectors · Head to head

Google Nest Protect (Wired) 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
Protecting a home that already has hardwired alarm wiring, the Google Nest Protect (Wired) is the smoke alarm that also detects carbon monoxide.
Google Nest Protect (Wired)
Winner
Google Nest Protect (Wired)
$499.99
Buy on Amazon USACheck price
It speaks the room before the siren, tests itself, and lights a path at night, on house power with three AA cells as backup. The Heiman HS1SA-E Zigbee Smoke Alarm is a small smoke-only detector on a CR123A cell, useful as a Zigbee sensor once a hub is present. The comparison favors the Google Nest Protect (Wired) on sensing and the safety extras. Buy the Heiman when you want a discreet smoke sensor inside a Zigbee system.
vs
Deals by email

Smoke & CO Detector prices change while you decide

We follow prices across the catalog and email you the best deals we find.

Smart home deals and news, straight to your inbox

Price drops, new releases and the smart home news worth knowing.

No spam. Unsubscribe in one click.

Your subscription could not be saved. Please try again.
Please enter a valid email address.
Your subscription has been successful.
FeatureGoogle Nest Protect (Wired)Heiman HS1SA-E Zigbee Smoke AlarmWinner
Price$499.99€34.99Heiman HS1SA-E Zigbee Smoke Alarm
Rating4.64.5Google Nest Protect (Wired)
Connectivity2.4 GHz WiFi, Bluetooth, OtherZigbeeGoogle Nest Protect (Wired)
IntegrationsGoogle Home, Home AssistantSamsung SmartThings, Home AssistantHeiman HS1SA-E Zigbee Smoke Alarm
SensorsSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionSmokeGoogle Nest Protect (Wired)
AlertsFire Alerts, CO Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsGoogle Nest Protect (Wired)
Tests ItselfYESNOGoogle Nest Protect (Wired)
PathlightYESNOGoogle Nest Protect (Wired)
Steam CheckYESNOGoogle Nest Protect (Wired)
ScreenNONOTie
Built-in SirenYESYESTie
Built-in LightYESYESTie

What the differences mean

Smoke only, or smoke and CO

The Google Nest Protect (Wired) detects smoke and carbon monoxide, with phone alerts for both, and the summary rates the sensors at about 10 years before the unit disables itself. The Heiman HS1SA-E Zigbee Smoke Alarm detects smoke only. It has no CO sensor and no CO alerts, so it does not replace a carbon monoxide alarm.

Mains power or a coin-style cell

The Google Nest Protect (Wired) runs on 120 V house power with three AA cells as backup, so routine battery swaps are not the job. The Heiman HS1SA-E Zigbee Smoke Alarm is battery only, a CR123A listed at 5 years. Its warranty length is not documented. The Nest warranty is 2 years.

Wi-Fi and Google Home, or Zigbee

The Google Nest Protect (Wired) uses 2.4 GHz Wi-Fi and Bluetooth, lists Google Home and Home Assistant, and interconnects with other Nest Protects over 802.15.4 even if Wi-Fi is off. 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, lists SmartThings, Home Assistant and automations, and does not support Alexa, Apple Home or Matter. Google Home is not documented for it.

Pathlight, steam check, self-test

The Google Nest Protect (Wired) tests itself, has a pathlight and uses Steam Check to cut nuisance alarms from showers and cooking. It also has occupancy, temperature, humidity, ambient light and motion sensors. The Heiman HS1SA-E Zigbee Smoke Alarm has a siren and a light, but pathlight, Steam Check and self-test are all no. It is much smaller, about 60 mm against 134 mm.

Which one to buy if

Winner
Google

Google Nest Protect (Wired)

Prime exclusive deal
$499.99
Buy on Amazon USACheck price
  • + Rating: 4.6
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Other
  • + Sensors: Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion
  • - Price: $499.99 vs €34.99
  • - Integrations: Google Home, Home Assistant vs Samsung SmartThings, Home Assistant

What owners say

Owners of both alarms talk about a loud warning from a device that was easier to mount than they expected, then the stories diverge. Google Nest Protect (Wired) owners single out skipping routine battery changes, a spoken warning that names the room, and phone alerts while they are away, plus a rotating mount that levels the square body. They are frustrated that it interconnects only with other Nest Protects, not with the wired alarms already in the ceiling, and some light sleepers turn the pathlight off. Heiman HS1SA-E Zigbee Smoke Alarm owners are surprised by how loud the small body is, and they like screws or the included adhesive pad. They report cells that fall short of a longer life they expected, and trouble sourcing the exact replacement.

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 (Wired)
  • Heiman HS1SA-E Zigbee Smoke Alarm

Loading price history...

Frequently Asked Questions

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

The Google Nest Protect (Wired), when you want smoke and carbon monoxide on existing alarm wiring, with a spoken warning, self-tests and a pathlight. The Heiman HS1SA-E Zigbee Smoke Alarm is the small Zigbee smoke sensor for SmartThings or Home Assistant, without CO detection.

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

The Google Nest Protect (Wired) is a mains smoke and CO alarm on Wi-Fi and Google Home. The Heiman HS1SA-E Zigbee Smoke Alarm is a battery smoke-only detector that needs a Zigbee hub and can run automations.

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

No. The Heiman HS1SA-E Zigbee Smoke Alarm has no CO sensor and no CO alerts. The Google Nest Protect (Wired) detects both smoke and carbon monoxide and can alert your phone for either.

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

Yes. The Google Nest Protect (Wired) lists a pathlight, and owners say it can be turned off per room if it wakes light sleepers. The Heiman HS1SA-E Zigbee Smoke Alarm has a built-in light, but pathlight is not supported.

Who should buy the Google Nest Protect (Wired)?

Homes with hardwired alarm wiring that want spoken room warnings, self-testing and CO coverage without routine battery changes. It only interconnects with other Nest Protects, and it does not support Alexa, Apple Home, SmartThings or Matter.

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

Anyone who wants a discreet smoke alarm for a bedroom, hallway or camper, especially on SmartThings or Home Assistant through a Zigbee hub. Plan on a CR123A and do not treat it as a CO alarm.

Full comparison table

Compare all 25 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.

  • 25 Smoke & CO Detectors
  • 44 specs compared
  • 41 filters
Open the full comparison
More Smoke & CO Detectors

Top Smoke & CO Detectors to compare next

25 smart smoke and CO detectors from 9 brands compared: X-Sense, First Alert, Kidde, Google Nest and more. Sensor types, interlink and alerts.

All Smoke & CO Detectors
Google

More Google products

A sharper look at other Google products worth comparing.

Explore Google
Heiman

More Heiman products

A sharper look at other Heiman products worth comparing.

Explore Heiman
Independent · Not sponsoredBrands never pay for placement or rankings. Affiliate commissions never influence our comparisons.
© 2026 Smart Home Compared
Search