The Smart Device Compare comparison

Heiman Matter Smoke Detector S1-TM vs Shelly Plus Smoke Alarm

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between Heiman Matter Smoke Detector S1-TM and Shelly Plus Smoke Alarm

A summary of selected recorded differences between these smoke & co detectors. Check the full specification table below for details and conditions.

Feature differences among your selected devices

2.4 GHz Wi-Fi (connectivity): Heiman Matter Smoke Detector S1-TM — No; Shelly Plus Smoke Alarm — Yes.
Built In Light (features): Heiman Matter Smoke Detector S1-TM — No; Shelly Plus Smoke Alarm — Yes.
Steam Check (features): Heiman Matter Smoke Detector S1-TM — Yes (Dual-beam sensing tells smoke apart from steam and cooking fumes to cut false alarms); Shelly Plus Smoke Alarm — No.
Tests Itself (features): Heiman Matter Smoke Detector S1-TM — Yes (Push to test button, and the test can be triggered remotely from Home Assistant); Shelly Plus Smoke Alarm — No.

Specifications to check side by side

Bluetooth (connectivity): Heiman Matter Smoke Detector S1-TM — No; Shelly Plus Smoke Alarm — For Pairing.
Thread (connectivity): Heiman Matter Smoke Detector S1-TM — Thread Border Router required; Shelly Plus Smoke Alarm — No.
Battery Life (power): Heiman Matter Smoke Detector S1-TM — 3.5 years; Shelly Plus Smoke Alarm — 5 years.

Information still to confirm

1 of 37 comparison fields lack a resolved value for at least one selected device. Missing information is not evidence that a feature is absent.
Check the full table and manufacturer documentation before ruling out a device.

These observations are derived from recorded catalog data and have not all been independently verified. Confirm details with the manufacturer before purchasing.

Compare capabilities, compatibility and setup requirements.

Option 1 · Heiman

Heiman Matter Smoke Detector S1-TM

Last updated October 2026

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Option 2 · Shelly

Shelly Plus Smoke Alarm

Catalog update date not recorded

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What the catalog tells us

Understand the tradeoffs.

These counts describe the available data, not a quality score. More features do not automatically make a better device.

12differences with recorded values for every device

1rows with missing or unspecified information

Consider your setup

Apple Home

Heiman Matter Smoke Detector S1-TMYes
Shelly Plus Smoke AlarmNo

Confirm which features appear in Apple Home and whether extra hardware or a subscription is needed for your intended use.

Inspect the specifications

Consider your setup

Matter

Heiman Matter Smoke Detector S1-TMYes
Shelly Plus Smoke AlarmNo

Confirm the exact device type and the features exposed in your chosen platform. Protocol support does not establish feature parity across apps.

Inspect the specifications

Consider your setup

Battery Life

Heiman Matter Smoke Detector S1-TM3.5 years
Shelly Plus Smoke Alarm5 years

Compare the stated test conditions. Catalog battery figures alone do not predict runtime in your home.

Inspect the specifications

Your priorities, side by side

Focus on what changes.

Mark the specifications you care about. Open manufacturer sources for verification scope; fields without citations remain catalog data. Expand notes for other qualifications.

Differences onlyMy priorities (0)

Showing 37 of 37 rows. “Not recorded” does not mean “No”.

Reading layout

Alerts

Air Quality Alerts

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Co Alerts

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Fire Alerts

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Local 85 dB alarm plus notifications through the Matter controller app
Shelly Plus Smoke Alarm: Yes

Low Battery Alerts

Heiman Matter Smoke Detector S1-TM: Yes
Shelly Plus Smoke Alarm: Yes

Temperature Alerts

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Connectivity

2.4 GHz Wi-Fi

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: Yes

5 GHz Wi-Fi

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Bluetooth

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: For Pairing

Other

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Thread

Heiman Matter Smoke Detector S1-TM: Thread Border Router required
Shelly Plus Smoke Alarm: No

Z Wave

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Zigbee

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Display

Screen

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Screen Type

Heiman Matter Smoke Detector S1-TM: Not applicable / unspecified
Shelly Plus Smoke Alarm: Not applicable / unspecified

Features

Automations

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Local Matter automations, no cloud required
Shelly Plus Smoke Alarm: Yes

Built In Light

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: Yes

Built In Siren

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
85 dB at 10 ft
Shelly Plus Smoke Alarm: Yes
Catalog note
>85db

Pathlight

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Steam Check

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Dual-beam sensing tells smoke apart from steam and cooking fumes to cut false alarms
Shelly Plus Smoke Alarm: No

Tests Itself

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Push to test button, and the test can be triggered remotely from Home Assistant
Shelly Plus Smoke Alarm: No

Integrations

Alexa

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Via Matter
Shelly Plus Smoke Alarm: No
Catalog note
Alexa's smart home API has no smoke or CO alarm type: the only supported route is the Matter Smoke CO Alarm device type, which this alarm does not speak

Apple Home

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Via Matter
Shelly Plus Smoke Alarm: No

Google Home

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Via Matter
Shelly Plus Smoke Alarm: Yes

Home Assistant

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Via Matter
Shelly Plus Smoke Alarm: Yes

Matter

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Matter 1.4 over Thread; Heiman holds CSA Matter certificates for its smoke sensors with temperature and humidity reporting
Shelly Plus Smoke Alarm: No

SmartThings

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Via Matter
Shelly Plus Smoke Alarm: Yes

Power

Battery Life

Heiman Matter Smoke Detector S1-TM: 3.5 years
Shelly Plus Smoke Alarm: 5 years

Battery Type

Heiman Matter Smoke Detector S1-TM: CR123A
Shelly Plus Smoke Alarm: CR123A

Wired

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Sensors

Air Quality

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Ambient Light

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Humidity

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Built-in humidity sensor reported over Matter
Shelly Plus Smoke Alarm: No

Motion

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Occupancy

Heiman Matter Smoke Detector S1-TM: No
Shelly Plus Smoke Alarm: No

Smoke

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Dual-beam photoelectric sensor, UL 217 10th Edition certified
Shelly Plus Smoke Alarm: Yes

Temperature

Heiman Matter Smoke Detector S1-TM: Yes
Catalog note
Built-in temperature sensor reported over Matter
Shelly Plus Smoke Alarm: No

Specifications for Heiman Matter Smoke Detector S1-TM versus Shelly Plus Smoke Alarm
Specification	Heiman Matter Smoke Detector S1-TM	Shelly Plus Smoke Alarm
Alerts
Air Quality Alerts	No	No
Co Alerts	No	No
Fire Alerts	Yes Catalog note Local 85 dB alarm plus notifications through the Matter controller app	Yes
Low Battery Alerts	Yes	Yes
Temperature Alerts	No	No
Connectivity
2.4 GHz Wi-Fi	No	Yes
5 GHz Wi-Fi	No	No
Bluetooth	No	For Pairing
Other	No	No
Thread	Thread Border Router required	No
Z Wave	No	No
Zigbee	No	No
Display
Screen	No	No
Screen Type	Not applicable / unspecified	Not applicable / unspecified
Features
Automations	Yes Catalog note Local Matter automations, no cloud required	Yes
Built In Light	No	Yes
Built In Siren	Yes Catalog note 85 dB at 10 ft	Yes Catalog note >85db
Pathlight	No	No
Steam Check	Yes Catalog note Dual-beam sensing tells smoke apart from steam and cooking fumes to cut false alarms	No
Tests Itself	Yes Catalog note Push to test button, and the test can be triggered remotely from Home Assistant	No
Integrations
Alexa	Yes Catalog note Via Matter	No Catalog note Alexa's smart home API has no smoke or CO alarm type: the only supported route is the Matter Smoke CO Alarm device type, which this alarm does not speak
Apple Home	Yes Catalog note Via Matter	No
Google Home	Yes Catalog note Via Matter	Yes
Home Assistant	Yes Catalog note Via Matter	Yes
Matter	Yes Catalog note Matter 1.4 over Thread; Heiman holds CSA Matter certificates for its smoke sensors with temperature and humidity reporting	No
SmartThings	Yes Catalog note Via Matter	Yes
Power
Battery Life	3.5 years	5 years
Battery Type	CR123A	CR123A
Wired	No	No
Sensors
Air Quality	No	No
Ambient Light	No	No
Co	No	No
Humidity	Yes Catalog note Built-in humidity sensor reported over Matter	No
Motion	No	No
Occupancy	No	No
Smoke	Yes Catalog note Dual-beam photoelectric sensor, UL 217 10th Edition certified	Yes
Temperature	Yes Catalog note Built-in temperature sensor reported over Matter	No

Know what’s behind the comparison.

The table matches specifications by section and field. It preserves notes, separates missing data from explicit “No” values, and keeps qualifications attached to their values. No overall winner is assigned from feature counts.

Read our comparison methodology