Heiman C1-R Review: A Wireless Interconnected CO Alarm That Goes Smart With a Gateway
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.
- Renters
- Multi-level homes
- Budget buyers
- Whole-home CO coverage
One alarm per floor, plus one per bedroom.
Buy on Amazon USACheck pricePros
- 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.


