Carbon Monoxide Safety in a Van: Heaters, Stoves and Generators
Carbon monoxide safety in a camper van: diesel heater exhaust, portable fuel-burning gear, generators, symptoms and UL 2034 alarms, per the CPSC and Webasto.
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.
Keep every combustion exhaust outside, never run portable fuel-burning gear inside the van, and fit a CO alarm that meets UL 2034. Those are the CPSC's rules, and Webasto's heater manual adds that improper installation can cause fire or deadly carbon monoxide leakage.
Where CO comes from
| Source | What the documents say |
|---|---|
| Installed diesel heater | Webasto: exhaust outlet positioned so fumes cannot enter the vehicle interior |
| Portable heaters and stoves | CPSC: never use portable fuel-burning camping equipment inside a vehicle |
| Generators | CPSC: never operate a portable generator in or near an enclosed space |
| Unvented appliances | CPSC: never operate unvented fuel-burning appliances where people sleep |
Symptoms
The CPSC lists the early symptoms of low to moderate CO poisoning as headache, fatigue, shortness of breath, nausea and dizziness, similar to the flu without the fever; high levels cause confusion, vomiting, loss of coordination, loss of consciousness and death.
Alarms
Install a CO alarm that meets UL 2034, per the CPSC, with battery power or battery backup. Picks are in best CO detectors for vans.
Heaters
An installed heater with exhaust under the floor is the right design for a van. Webasto's manual also requires a sign at the fuel filler telling you to switch the heater off before refueling. All-in-one heaters belong outside the van: see portable diesel heaters and how to install a diesel heater.
Frequently asked questions
Can you get carbon monoxide poisoning in a van?
Yes, from any fuel-burning appliance whose exhaust gets inside. The CPSC says never to use portable fuel-burning camping equipment inside a vehicle.
Is a diesel heater a carbon monoxide risk?
Webasto's manual warns that improper installation can leak deadly carbon monoxide. Install it with the exhaust outside and fit a CO alarm.
What are the symptoms of carbon monoxide poisoning?
Headache, fatigue, shortness of breath, nausea and dizziness at first, according to the CPSC; confusion, vomiting and unconsciousness at high levels.
Can I run a generator near my van?
The CPSC says never to operate a portable generator in or near an enclosed space; keep it well away from the van.
Do I need a CO alarm if my heater has one built in?
Yes. A heater's built-in sensor is not a substitute for a UL 2034 alarm where you sleep, which is what the CPSC recommends.
Sources
- Carbon Monoxide Questions and Answers, U.S. Consumer Product Safety Commission
- Air Top 2000 STC Installation Manual, Webasto Thermo & Comfort N.A.
Cover photo: Campervan, travel concept vehicle, CC0 1.0, via rawpixel. Cropped.
Related guides
Best Carbon Monoxide Detectors for Vans in 2026
CO alarms for vans with heaters, stoves or generators nearby.
Camper Van Build Guide: The Gear That Makes a Van Livable
Start here: what each system needs and where to read more.
Van Build Order: What to Install First
A sequence that avoids doing anything twice.