Best Carbon Monoxide Detectors for Vans in 2026
The best carbon monoxide detectors for camper vans in 2026: Kidde, Heiman, First Alert and 12V Safe-T-Alert RV alarms compared on UL 2034, power and display.
Affiliate disclosure: product links on this page go to Amazon or to the maker's own store. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you; links to makers' own stores earn us nothing. No retailer or brand sees our picks before they are published or has any say in them. How we choose.
The Kidde COB is the pick: sold by Amazon, battery-powered, stated to meet UL 2034 5th Edition and ETL listed, with a 10-year limited warranty (per the Amazon listing). The CPSC tells consumers to install a CO alarm that meets UL 2034.
For a hardwired 12V alarm, the Safe-T-Alert 62 Series is made for RVs (per the Amazon listing). The CPSC notes that CO alarms are available for recreational vehicles and should be used. Picks were chosen on the stated standard, power and display.
Our top picks at a glance
1. Best overall
Kidde COBStandard: UL 2034 5th Ed., ETL · Power: AA batteries · Display: LED status · Warranty: 10 years limited
2. Best low-level display
Heiman HM-735ESYStandard: UL 2034 5th Ed., CSFM · Power: AA batteries · Display: Digital · Warranty: Not stated
3. Best hardwired 12V
Safe-T-Alert 62 Series RV CO Alarm (12V)Standard: Not stated · Power: 12V · Display: Not stated · Warranty: Not stated
4. Best budget
First Alert CO400Standard: Not stated · Power: Batteries · Display: None · Warranty: 5 years limited
5. Best portable meter
TOPTES CT-580 Portable CO DetectorStandard: Not stated · Power: Rechargeable · Display: Color, 0 to 1,000 ppm · Warranty: Not stated
| Pick | Standard | Power | Display | Warranty | Buy |
|---|---|---|---|---|---|
| Kidde COBBest overall | UL 2034 5th Ed., ETL | AA batteries | LED status | 10 years limited | Amazon |
| Heiman HM-735ESYBest low-level display | UL 2034 5th Ed., CSFM | AA batteries | Digital | Not stated | Amazon |
| Safe-T-Alert 62 Series RV CO Alarm (12V)Best hardwired 12V | Not stated | 12V | Not stated | Not stated | Amazon |
| First Alert CO400Best budget | Not stated | Batteries | None | 5 years limited | Amazon |
| TOPTES CT-580 Portable CO DetectorBest portable meter | Not stated | Rechargeable | Color, 0 to 1,000 ppm | Not stated | Amazon |
Best overall
Kidde COB
For most vans.
- Standard
- UL 2034 5th Ed., ETL
- Power
- AA batteries
- Display
- LED status
- Warranty
- 10 years limited
Pros
- 85 dB alarm (per the Amazon listing)
- Sold by Amazon
Cons
- No digital readout
Kidde lists UL 2034 5th Edition testing, ETL listing and an 85 dB alarm (per the Amazon listing). The COBD adds a backlit digital display.
Best low-level display
Heiman HM-735ESY
For seeing CO levels before an alarm.
- Standard
- UL 2034 5th Ed., CSFM
- Power
- AA batteries
- Display
- Digital
- Warranty
- Not stated
Pros
- Low-level digital display (per the Amazon listing)
Cons
- Less-known brand
Heiman lists UL 2034 5th Edition certification and California State Fire Marshal approval (per the Amazon listing).
Best hardwired 12V
Safe-T-Alert 62 Series RV CO Alarm (12V)
For a permanent install.
- Standard
- Not stated
- Power
- 12V
- Display
- Not stated
- Warranty
- Not stated
Pros
- Made for RVs (per the Amazon listing)
- Flush mount (per the Amazon listing)
Cons
- Needs 12V wiring
- Standard not stated in the listing
The 62 Series is a flush-mount 12V RV CO alarm (per the Amazon listing). The 85 Series also senses propane, for vans with a gas stove (per the Amazon listing).
Best budget
First Alert CO400
For a second alarm.
- Standard
- Not stated
- Power
- Batteries
- Display
- None
- Warranty
- 5 years limited
Pros
- Sold by Amazon
Cons
- Standard not stated in the listing
First Alert's CO400 is a battery CO alarm with a 5-year limited warranty (per the Amazon listing). The SMCO100 combines smoke and CO.
Best portable meter
TOPTES CT-580 Portable CO Detector
For checking levels around the van.
- Standard
- Not stated
- Power
- Rechargeable
- Display
- Color, 0 to 1,000 ppm
- Warranty
- Not stated
Pros
- Vibration, visual and audible alarms (per the Amazon listing)
Cons
- A meter, not a substitute for a UL 2034 alarm
TOPTES lists a 0 to 1,000 ppm range and a rechargeable battery (per the Amazon listing). Use it alongside a fixed alarm.
How we chose
We put alarms that state UL 2034 first, since that is the standard the CPSC names, then compared power and display.
Why a van needs one
A diesel heater is the usual CO source in a van, and Webasto's installation manual warns that improper installation or repair can cause fire or the leakage of deadly carbon monoxide. An alarm is the check that the exhaust stays outside.
Where to put it
- Near where you sleep; the CPSC advises alarms outside sleeping areas in a home.
- Not right next to a heating vent or where bedding can cover it, per the CPSC.
- Not directly above a fuel-burning appliance, per the CPSC.
Testing and replacement
The CPSC notes that the test button checks the circuitry, not the sensor's accuracy, and that alarms have a replacement age set by the maker.
More
Read carbon monoxide safety in a van and how to install a diesel heater.
Frequently asked questions
What carbon monoxide detector is best for a van?
One that meets UL 2034, as the CPSC advises. The Kidde COB lists UL 2034 5th Edition, AA power and a 10-year limited warranty.
Where should a CO detector go in a camper van?
Near the sleeping area, away from heating vents and bedding that could cover it, and not directly above a fuel-burning appliance.
Do RVs and vans need CO alarms?
The CPSC says CO alarms are available for recreational vehicles and should be used, and that the RVIA requires them in motor homes and trailers.
Is a 12V CO alarm better than battery?
A hardwired 12V alarm cannot be left without batteries; a battery alarm works anywhere. Either way, check the standard it meets.
How often should I replace a CO detector?
At the replacement age the maker gives, according to the CPSC. The test button checks circuitry, not sensor accuracy.
Sources
- Carbon Monoxide Questions and Answers, U.S. Consumer Product Safety Commission
- Air Top 2000 STC Installation Manual, Webasto Thermo & Comfort N.A.
Related guides
Camper Van Build Guide: The Gear That Makes a Van Livable
Start here: what each system needs and where to read more.
Carbon Monoxide Safety in a Van: Heaters, Stoves and Generators
Where CO comes from in a van, and how to keep it out.
Van Build Order: What to Install First
A sequence that avoids doing anything twice.