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, and owners describe a compact alarm that installs in minutes, sounds loud enough and does not blind the room with its indicator light. 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, as long as you do not need it to join a hardwired interconnect.
- Renters
- Multi-level homes
- Budget buyers
- Replacing expired CO alarms
Pros
- FIGARO TGS5141 electrochemical CO sensor, UL 2034 5th Edition
- Quick install and easy testing
- Wireless 915 MHz interlink with other Heiman RF alarms
- Battery rated for 10 years, no wiring needed
- Compact body, loud alarm and a gentle indicator light
- 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
- Links only to Heiman RF alarms, not to a hardwired interconnect
- No Matter, Alexa or Apple Home support
- No display for live CO readings
- Detects carbon monoxide only, not smoke
- The low-battery chirp can be hard to live with
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. Many owners buy it simply to replace an older detector that has reached the end of its sensor life. 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 owners like about it
Owners keep coming back to how simple it is: it installs in a few minutes, tests easily and syncing several units is described as easy to set up. They like that it is compact, that the alarm is loud, that the 10-year battery means no regular swaps, and that the indicator light is not harsh like the strobe-like lights of other alarms. The most common verdict is that it is a good-value replacement that does its quiet job.
What to know before you buy
The C1-R is not a smart alarm out of the box. App notifications and links to Google Home, SmartThings or Home Assistant all go through the optional Heiman WS3GW-R gateway, which is sold separately. There is no Matter, Thread or Zigbee radio, Alexa has no CO alarm type outside Matter, and Apple Home is not supported. It is battery powered and links to other Heiman RF alarms only, not to a hardwired system: one owner found it did not satisfy a building inspector's interconnect requirement, and another was annoyed by a low-battery chirp that repeats about every 30 seconds with no way to silence it. It has no display, it detects carbon monoxide only, not smoke, and its warranty is not documented.
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. Complaints are few and individual. Buyers who need a hardwired interconnect for code, or want their CO alarm inside Apple Home or Alexa, should look at another model.
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. It does not join a hardwired interconnect.
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.
Is it easy to install?
Yes. Owners say it takes only a few minutes, and the test button makes it simple to confirm it is working.












