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Smoke & CO Detectors · Head to head

Heiman HS1SA-E Zigbee Smoke Alarm vs Shelly Plus Smoke Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Updated October 2026
Data from Amazon and official Heiman and Shelly sites.
2026 verdict
Hub-bound Zigbee against hub-free Wi-Fi: the Heiman HS1SA-E Zigbee Smoke Alarm edges out the Shelly as the better-value smoke alarm, with a lower price and a smaller body.
Heiman HS1SA-E Zigbee Smoke Alarm
Winner
Heiman HS1SA-E Zigbee Smoke Alarm
€34.99
Buy on Amazon GermanyCheck price
Both batteries are rated for 5 years, owners rate the Heiman slightly higher, and at 60 x 60 mm it is the more discreet of the two. The Shelly Plus Smoke Alarm wins on connectivity and reach: it joins 2.4 GHz Wi-Fi directly with no hub, works with Google Home, SmartThings and Home Assistant, and carries a 3-year warranty, where the Heiman needs a Zigbee hub and reaches only SmartThings and Home Assistant. Both detect smoke only and both support automations. Pick the Heiman HS1SA-E Zigbee Smoke Alarm if you already run a Zigbee hub, and the Shelly Plus Smoke Alarm if you want Google Home alerts without one.
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FeatureHeiman HS1SA-E Zigbee Smoke AlarmShelly Plus Smoke AlarmWinner
Price€34.99€39.95Heiman HS1SA-E Zigbee Smoke Alarm
Rating4.54.4Heiman HS1SA-E Zigbee Smoke Alarm
ConnectivityZigbee2.4 GHz WiFi, BluetoothShelly Plus Smoke Alarm
Battery Life5 years5 yearsTie
IntegrationsSamsung SmartThings, Home AssistantGoogle Home, Samsung SmartThings, Home AssistantTie
ScreenNONOTie
SensorsSmokeSmokeTie
AlertsFire Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
Built-in LightYESYESTie
Tests ItselfNONOTie
PathlightNONOTie

What the differences mean

Hub or Wi-Fi

The Heiman HS1SA-E Zigbee Smoke Alarm uses Zigbee, so phone alerts and automations need a hub such as SmartThings or Home Assistant. The Shelly Plus Smoke Alarm joins 2.4 GHz Wi-Fi directly and alerts your phone with no extra hardware.

Voice assistants and platforms

The Shelly Plus Smoke Alarm works with Google Home, SmartThings and Home Assistant. The Heiman HS1SA-E Zigbee Smoke Alarm reaches SmartThings and Home Assistant through its hub. Neither works with Alexa, Apple HomeKit or Matter.

Battery life

Both are rated for 5 years on a CR123A cell, so battery life does not separate them. Some Heiman owners report their cell falling short of that rating and struggle to find the exact replacement.

Size

The Heiman HS1SA-E Zigbee Smoke Alarm measures 60 x 60 mm, the Shelly Plus Smoke Alarm 86 x 88 mm. Both are small by smoke alarm standards, but the Heiman is the one that disappears in a campervan or a bedroom corner.

Which one to buy if

What owners say

Owners of both are impressed by how loud the siren is and how little effort setup takes. Heiman HS1SA-E Zigbee Smoke Alarm owners dwell on its small, discreet design and mounting it with screws or an adhesive pad in bedrooms and campervans, and their complaints are about the battery: some found it short of its rated five years and the exact replacement cell hard to find. Shelly Plus Smoke Alarm owners are Home Assistant, MQTT and Shelly users who single out pairing over Wi-Fi in minutes, push alerts while away and a long battery life; their complaints are a short pairing window when adding several units and, from a small minority, false alarms after months of use.

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.

  • Heiman HS1SA-E Zigbee Smoke Alarm
  • Shelly Plus Smoke Alarm

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Frequently Asked Questions

Which is better: Heiman HS1SA-E Zigbee Smoke Alarm or Shelly Plus Smoke Alarm?

The Heiman HS1SA-E Zigbee Smoke Alarm is the better value, with a lower price and a smaller housing. The Shelly Plus Smoke Alarm is the better pick when you want hub-free Wi-Fi and Google Home support.

Do the Heiman HS1SA-E Zigbee Smoke Alarm and the Shelly Plus Smoke Alarm need a hub?

The Heiman HS1SA-E Zigbee Smoke Alarm needs a Zigbee hub for alerts and automations. The Shelly Plus Smoke Alarm does not: it connects to 2.4 GHz Wi-Fi on its own.

Which works with Alexa?

Neither does, since Alexa has no device type for smoke alarms outside Matter. The Shelly Plus Smoke Alarm works with Google Home, SmartThings and Home Assistant, and the Heiman HS1SA-E Zigbee Smoke Alarm reaches SmartThings and Home Assistant through a Zigbee hub.

Do either detect carbon monoxide?

No. The Heiman HS1SA-E Zigbee Smoke Alarm and the Shelly Plus Smoke Alarm are both smoke only, so pair either one with a CO alarm near gas appliances.

Who should buy the Shelly Plus Smoke Alarm?

Home Assistant, MQTT and Shelly users, and Google Home households, who want a smoke alarm on Wi-Fi with no hub. The Shelly Plus Smoke Alarm also has a 3-year warranty, but no HomeKit or Matter.

Full comparison table

Compare all 25 Smoke & CO Detectors side by side

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