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Heiman Interconnected CO Alarm C1-R

Heiman Interconnected CO Alarm C1-R

A FIGARO electrochemical sensor, a 10-year battery rating and 915 MHz interlinking that sounds every alarm at once, with app alerts only through Heiman's gateway.

4.0
24 ratings
10% OFF
$29.98
$26.99
1

One alarm per floor, plus one per bedroom.

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Launch Year: 2026

Model: C1-R

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Our review

Heiman C1-R Review: A Wireless Interconnected CO Alarm That Goes Smart With a Gateway

The verdict

The Heiman C1-R is a battery-powered carbon monoxide alarm built around a Japan-made FIGARO electrochemical sensor, certified to UL 2034 5th Edition, that links wirelessly with other Heiman RF alarms so every unit sounds when one detects CO. On its own it needs no Wi-Fi, hub or wiring, which suits renters and older homes. Phone alerts and smart home links require the separate Heiman WS3GW-R gateway, and there is no Matter, Alexa or Apple Home path. It is a budget-friendly way to build a whole-home CO network.

Best for
  • Renters
  • Multi-level homes
  • Budget buyers
  • Whole-home CO coverage
1

One alarm per floor, plus one per bedroom.

Buy on Amazon USACheck price

Pros

  • FIGARO TGS5141 electrochemical CO sensor, UL 2034 5th Edition
  • Wireless 915 MHz interlink with other Heiman RF alarms
  • Battery rated for 10 years, no wiring needed
  • Continuous self-diagnostics and low-battery warnings
  • Optional gateway adds app alerts, Google Home, SmartThings and Home Assistant

Cons

  • Smart features require the separate Heiman gateway
  • No Matter, Alexa or Apple Home support
  • No display for live CO readings
  • Detects carbon monoxide only, not smoke

Who is the Heiman C1-R for?

It suits anyone who needs carbon monoxide alarms on several floors or rooms without running wires: a house with a gas furnace, a fireplace or an attached garage, a rental or a dorm where drilling is restricted. Each unit runs on a CR123A lithium battery rated for 10 years, and the alarms talk to each other over a 915 MHz radio with no router or hub involved, so a leak in the basement also sounds in the bedrooms.

What the Heiman C1-R offers

The core is the FIGARO TGS5141 electrochemical sensor, the kind of cell that measures carbon monoxide specifically and resists drift from temperature and humidity changes. It is certified to UL 2034 5th Edition and sounds an 85 dB alarm with a test and silence button on the face. The RF interlink reaches up to 800 ft in open areas according to Heiman and can mix CO units with Heiman RF smoke alarms such as the S1-R. The alarm also runs continuous self-checks of its sensor, radio link and battery and warns when the battery runs low.

What to know before you buy

The C1-R is not a smart alarm out of the box. App notifications, remote silencing and links to Google Home, SmartThings or Home Assistant all go through the Heiman WS3GW-R gateway, which is sold separately or in a kit. There is no Matter, Thread or Zigbee radio, Alexa has no CO alarm type outside Matter, and Apple Home is not supported. It has no display, so you cannot read the CO level on the unit, and it detects carbon monoxide only, not smoke.

Is the Heiman C1-R worth it?

As an affordable building block for an interconnected CO network it makes a lot of sense: a quality electrochemical sensor, a long battery rating and whole-home interlinking with no wiring. Buyers who want their CO alarm inside Apple Home or Alexa should look at a Matter model such as Heiman's own C1-M instead.

Frequently asked questions

Does the Heiman C1-R need Wi-Fi or a hub?

No for the alarm itself: it works standalone and interconnects with other Heiman RF alarms over 915 MHz. For phone alerts and smart home integrations you need the Heiman WS3GW-R gateway, which joins a 2.4 GHz Wi-Fi network.

Can the Heiman C1-R interconnect with smoke alarms?

Yes. It links with other Heiman RF life-safety devices such as the S1-R smoke alarm, so when one unit detects a hazard every linked alarm sounds.

Does the Heiman C1-R work with Alexa or Apple Home?

No. It has no Matter radio, Alexa has no carbon monoxide alarm type outside Matter, and Apple Home is not supported. Through the Heiman gateway it can reach Google Home, SmartThings and Home Assistant.

What battery does the Heiman C1-R use?

A CR123A lithium battery that Heiman rates for 10 years. The alarm warns you when the battery runs low.

At a glance

Summary

Everything this smoke & co detector supports, grouped by category.

Size & Materials
Ø2.8 × 1.5 in (Ø70 × 37 mm)
Connectivity
2.4 GHz WiFi (Heiman Gateway required)
Integrations
Google Home (Heiman Gateway required)Samsung SmartThings (Heiman Gateway required)Home Assistant (Heiman Gateway required)
Sensors
CO
Alerts
CO AlertsLow Battery Alerts
Features
Built-in SirenTests Itself

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Company
Heiman logo

Heiman

4.4/ 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.

Size & Materials
Dimensions

Ø2.8 × 1.5 in (Ø70 × 37 mm)

Weight

?

Power
Wired

NO

Battery Type

CR123A

Battery Life

10 years

Connectivity
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 S1-R so one alarm sets them all off

Integrations
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 carbon monoxide alarm device type outside Matter, and the C1-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

Display
Screen

NO

Screen Type

-

Sensors
Smoke

NO

CO

YES

Japan-made FIGARO TGS5141 electrochemical sensor, UL 2034 5th Edition

Occupancy

NO

Temperature

NO

Humidity

NO

Air Quality

NO

Ambient Light

NO

Motion

NO

Alerts
Fire Alerts

NO

CO Alerts

YES

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

Low Battery Alerts

YES

Temperature Alerts

NO

Air Quality Alerts

NO

Features
Built-in Siren

YES

85 dB at 10 ft

Built-in Light

NO

Tests Itself

YES

Continuous sensor, RF link and battery self-diagnostics, plus a test and silence button

Pathlight

NO

Steam Check

NO

Automations

Heiman Gateway required

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

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