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Last updated October 2026

Heiman Interconnected Smoke Alarm S1-R

Dual-beam photoelectric sensing and 915 MHz wireless interlinking in a compact battery alarm, with app alerts only through Heiman's gateway.

4.2
44 ratings

Also sold in packs

  • Pack of 3$69.98$23.33 per unitBuy
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Launch Year: 2026

Model: S1-R

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Connectivity
  • Wi-Fi 2.4 GHz
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Our review

Heiman S1-R Review: A Tiny Interlinked Smoke Alarm That Owners Like for Size and Install, With Mixed Pairing and False Alarm Reports

The verdict

The Heiman S1-R is a compact battery-powered photoelectric smoke alarm that links wirelessly with other Heiman RF alarms, so every unit sounds when one detects smoke, and it needs no wiring, Wi-Fi or hub to do that. Owners like the small size, the quick screw or magnet mounting and a siren they call loud, but experiences with the wireless pairing and with nuisance alarms are mixed, so it suits a renter or retrofit who is willing to follow the pairing steps closely. Phone alerts and smart home links need the separate Heiman WS3GW-R gateway, and there is no Matter, Alexa or Apple Home support.

Best for
  • Renters
  • Multi-level homes
  • Budget buyers
  • Retrofits without wiring

Pros

  • Compact battery puck that needs no wiring
  • Easy mounting with screws or a magnetic and adhesive plate
  • Loud siren that owners say is piercing in a test
  • Wireless 915 MHz interlink with other Heiman smoke and CO alarms
  • Dual-beam photoelectric sensor, UL 217 10th Edition, with a battery rated for about 8.3 years
  • Optional gateway adds app alerts, Google Home, SmartThings and Home Assistant

Cons

  • Wireless pairing steps are unclear for some owners and can take repeated tries
  • Some owners report false alarms, including one unit that sets off the whole network
  • Smart features require the separate Heiman gateway
  • No Matter, Alexa or Apple Home support
  • Detects smoke only, not carbon monoxide, and has no display

Who is the Heiman S1-R for?

It suits homes that need smoke alarms that talk to each other but have no interconnect wiring: older houses, apartments, rentals and secondary rooms. It runs on a CR123A lithium battery that Heiman rates for about 8.3 years, needs no wiring at all, and at 2.76 in across it is small enough to disappear on a bedroom ceiling. Buyers can start with a single alarm or a multipack and add more units to the network later.

What owners like about the Heiman S1-R

Size and installation come up most. Owners call it cute and compact, and say it goes up quickly with either screws or the magnetic and adhesive mount. Several say the alarm is loud and piercing when tested, and one chose it for the photoelectric sensor because it is less likely to trip on cooking. Owners who completed the wireless linking like that the alarms can be tied together without running cable and that more can be added later.

What to know before you buy

The wireless pairing is the weak point for some owners: one spent two hours following the manual and could only join two of three units, calling the instructions unclear, though others found it quick. False alarms are the second theme. One owner had a unit sound several times a day and night with no smoke, and another set off all three units of a multipack by cooking bacon. One owner's unit did not react to vape smoke, and a three-pack arrived with one dead unit. Out of the box the S1-R is an interconnected alarm, not a connected one: it has no app, no Wi-Fi and no Matter radio, and push notifications, automations and links to Google Home, SmartThings and Home Assistant need the separate WS3GW-R gateway. Alexa and Apple Home are not supported, and it detects smoke only, so a CO alarm is still needed near fuel-burning appliances.

Is the Heiman S1-R worth it?

For whole-home interlinked smoke protection without an electrician it is attractive on price and size, and the network can grow with Heiman RF smoke and CO alarms. The mixed reports on pairing and nuisance alarms mean it is worth testing every unit and the linking right after installation, and keeping the return window in mind. Anyone who wants alerts in Apple Home or Alexa should look at a Matter-certified alarm instead.

Frequently asked questions

Does the Heiman S1-R connect to Wi-Fi or an app?

Not by itself. The alarms interconnect with each other over a 915 MHz radio. For phone alerts and smart home integrations you add the Heiman WS3GW-R gateway, which joins a 2.4 GHz Wi-Fi network.

Can the Heiman S1-R interconnect with carbon monoxide alarms?

Yes. It links with other Heiman RF alarms such as the C1-R CO alarm, so any hazard sets off every linked unit.

Does the Heiman S1-R work with Alexa or Apple Home?

No. It has no Matter radio and neither platform supports it. Through the Heiman gateway it can reach Google Home, SmartThings and Home Assistant.

What battery does the Heiman S1-R use?

A CR123A lithium battery that Heiman rates for about 8.3 years on this model. It warns when the battery runs low.

Is the Heiman S1-R easy to install?

Owners say it is: it is battery powered, needs no wiring and mounts with screws or a magnetic and adhesive plate. The wireless linking between several units takes more care, so follow the manual's steps in order.

Company
Heiman logo

Heiman

4.1/ 5 avg ratingChina flagHeadquartered in China

Heiman is a Chinese manufacturer of smart safety and security sensors, including smoke alarms, gas detectors, water leak sensors and door/window contacts. The company produces Zigbee and Z-Wave devices used across many smart home hubs and is a common original equipment supplier for other brands. Heiman focuses on affordable, safety-oriented sensors for home automation.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Dimensions

Ø2.8 × 1.5 in Ø70 × 37 mm

Weight

?

Wired

NO

Battery Type

CR123A

Battery Life

8.3 years

2.4 GHz WiFi

Heiman Gateway required

The alarm itself has no Wi-Fi: the optional WS3GW-R gateway joins a 2.4 GHz network and relays its alerts to the Heiman app

5 GHz WiFi

NO

Bluetooth

NO

Zigbee

NO

Z-Wave

NO

Thread Protocol

NO

Other

RF wireless interconnect

915 MHz Sub-1G radio, up to 800 ft in open areas per Heiman; links with other Heiman RF alarms such as the C1-R CO alarm

Google Home

Heiman Gateway required

Through the Heiman WS3GW-R gateway, which Heiman says works with Home Assistant, IFTTT, Google Home and SmartThings

Alexa

NO

Alexa has no smoke alarm device type outside Matter, and the S1-R is not a Matter device

Apple HomeKit

NO

Samsung SmartThings

Heiman Gateway required

Through the Heiman WS3GW-R gateway, which Heiman says works with Home Assistant, IFTTT, Google Home and SmartThings

Home Assistant

Heiman Gateway required

Through the Heiman WS3GW-R gateway, which Heiman says works with Home Assistant, IFTTT, Google Home and SmartThings

Matter

NO

Screen

NO

Screen Type

-

Smoke

YES

Dual-beam photoelectric sensor, UL 217 10th Edition

CO

NO

Occupancy

NO

Temperature

NO

Humidity

NO

Air Quality

NO

Ambient Light

NO

Motion

NO

Fire Alerts

YES

Local 85 dB alarm on every linked unit, plus app push alerts when paired to the Heiman gateway

CO Alerts

NO

Low Battery Alerts

YES

Temperature Alerts

NO

Air Quality Alerts

NO

Built-in Siren

YES

85 dB at 10 ft

Built-in Light

NO

Tests Itself

YES

Continuous RF heartbeat and optical chamber drift monitoring, plus a test and silence button

Pathlight

NO

Steam Check

YES

Dual-beam photoelectric sensing sizes smoke particles to reduce steam and cooking false alarms

Automations

Heiman Gateway required

Automations run in the Heiman app or a linked platform once the gateway is added

Local Control

?

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