Best RV Carbon Monoxide and Propane Detectors
Jake has spent 8 years full-timing in a Class A motorhome and has personally tested hundreds of RV products across North America. He is the lead gear reviewer at Shop RV Gear, covering solar setups, backup safety syst…
Why trust us
Every product featured on Shop RV Gear is researched by RV owners with real on-road experience. Our lead reviewer Jake Morris has full-timed for 8 years and personally tested gear across 40+ states. We earn a small commission on qualifying purchases — this never influences our picks.
How We Evaluated
We researched and tested the top options, comparing them across key factors including performance, value, ease of use, and reliability. Our recommendations are based on hands-on evaluation and real-world usage data.
⚡ Quick Picks
- #1 Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL $58.02 View on Amazon →
- #2 Safe-T-Alert by MTI Industries 35-742-BR 35 Series Dual LP/CO Alarm - Flush Mount, Brown $61.13 View on Amazon →
- #3 Safe T Alert - Mini Dual LP/CO Alarm - Flush Mount Black - 25-742-BL $75.91 View on Amazon →
Short answer
For most RV owners, the best choice is a hardwired combination carbon monoxide and propane detector built specifically for RV use, with a clear replacement date and the correct low-wall mounting position. Combination units are standard in RVs because propane is heavier than air and CO alarms need to protect the sleeping area, so the placement and RV-specific listing matter as much as the brand name.[2][3][9]
If your current alarm is older than about five years, replace it even if it still powers on, because RV LP-gas and CO detectors are commonly recommended for replacement on that cycle.[3] A good detector should be easy to install, fit your cutout, and be loud enough to wake you up—not just look good in a product listing.[2][6][9]
Best use cases by RV type
| RV type | Best detector approach | Why |
|---|---|---|
 Travel trailer |
Hardwired RV combo LP/CO alarm | Covers both main risks in a compact space[2][9] |
| Fifth wheel | Hardwired RV combo LP/CO alarm near sleeping area | Good protection for enclosed sleeping space[2] |
| Motorhome |
Hardwired RV combo LP/CO alarm plus optional battery CO alarm | Adds backup coverage when living and sleeping in the coach[2][3] |
| Older used RV | Replacement combo alarm matched to existing cutout | Fastest way to restore safety[3][8] |
Best RV carbon monoxide and propane detectors: our top picks
1. Best overall: Safe T Alert RV combination LP/CO alarm
This is the type of detector most RV owners should be looking for first: a dedicated RV combination alarm that covers both propane and carbon monoxide in one unit and is built for the realities of trailer and motorhome installation.[9] RV safety guidance and dealer manuals consistently point to combination LP-gas/CO alarms as the normal solution, with propane detection placed low because propane settles near the floor.[2][4][9]
Why it wins
- RV-specific design: built for RV electrical systems and installation patterns.[9]
- Combo protection: covers the two gases most RVers actually worry about in the same rig.[2][4][9]
- Straightforward replacement: typical RV owners can swap in a like-for-like unit without rethinking the whole safety setup.[3][9]
Pros
- Proper RV-focused LP/CO protection[9]
- Generally simple to install as a replacement[9]
- Right alarm type for most campers[2][4]
Cons
- You still need to verify cutout size and wiring before buying
- Combo alarms do not replace smoke alarms
- Any unit past its service life should be replaced, not trusted[3]
2. Best for easy replacement: RV combo alarm with matching cutout and wire lead
If you are replacing a dead alarm, the smartest buy is often the one that fits your existing opening without cabinet surgery. RV forum and retailer guidance both show that buyers commonly need to match the original footprint and connector style, because the “best” detector is the one installed correctly and quickly.[2][8][9]
Why it matters
- A detector that fits the existing cutout reduces installation mistakes.
- RV combo alarms are typically mounted low on a wall for propane detection.[2][9]
- A clean replacement is more likely to actually get done instead of being delayed.[3][8]
Pros
- Simplest swap for aging factory alarms
- Less risk of bad installation
- Best value when your current alarm already worked well for your rig
Cons
- Compatibility matters more than brand hype
- You may need to check model number, polarity, and dimensions carefully
3. Best budget pick: basic RV propane/CO combination alarm
A lower-cost combo unit can be a practical choice if you need to restore safety fast and your rig’s electrical setup is simple. The key is not chasing the cheapest internet generic; the unit should still be intended for RV use and provide both LP-gas and CO detection.[6][9]
Pros
- Lower upfront cost
- Good option for older rigs or resale projects
- Usually covers the essential hazards
Cons
- May have a less refined fit or finish
- Budget units can be harder to verify for proper RV-specific application
- No bargain is worth it if the detector is already near end of life
4. Best portable add-on: standalone battery-powered CO alarm
A combo RV alarm is the main line of defense, but a battery-powered standalone CO alarm can be a sensible backup near the sleeping area. This is especially useful if you want another layer of protection away from the original hardwired point.[2][6]
Pros
- Easy to place near beds or in tow vehicles
- Works as a secondary layer of protection
- Useful during maintenance or when the RV battery is disconnected
Cons
- Does not replace a hardwired RV LP/CO alarm
- Battery life and placement still matter
- Propane detection still belongs low on the wall, not on a nightstand[2]
What to skip and why
- Skip generic home-only CO alarms if you need propane detection too; RV guidance and manufacturer documentation point to combo LP-gas/CO alarms for most rigs.[2][6][9]
- Skip CO2 confusion; the hazard is carbon monoxide, not carbon dioxide.[4]
- Skip expired detectors; RV LP-gas and CO alarms are commonly recommended for replacement about every five years.[3]
- Skip the wrong mounting location; propane alarms belong low because propane is heavier than air, while CO protection is often positioned to help warn the sleeping area.[2]
What actually matters when buying one
1. RV-specific certification and intended use
Look for a unit explicitly made for RV use. Forest River’s manual identifies its combination alarm as UL listed for RV carbon monoxide and propane gas detection, which is the kind of language you want to see in the product documentation.[9]
2. Replacement age
If your current alarm is about five years old, replace it instead of trying to nurse it along. RV safety guidance says LP-gas and CO detectors should typically be replaced every five years regardless of whether they still seem functional.[3]
3. Mounting location
Propane alarms should be low because propane sinks; forum guidance commonly places the combo detector near the floor or low on a wall, while CO protection is more useful near sleeping spaces.[2][4]
4. Fit and wiring
In RVs, a detector that does not fit the cutout or match the wiring is a headache, not a safety upgrade. Retail and forum guidance repeatedly show that exact dimensions and connector compatibility matter in real-world replacements.[2][8]
5. Testability and maintenance
Choose a unit you will actually test. RV guidance recommends routine testing, and replacement is the real fix when a detector chirps, fails, or reaches end of life.[3][7]
How to install an RV combo detector the right way
- Turn off power before removing the old unit.
- Match the new detector’s cutout size and wiring before you commit.
- Mount the unit in the same general low-wall location if it is a propane/CO combo alarm.[2][9]
- Check the manufacture or replacement date so you know when it will need to be replaced again.[3]
- Test it after installation and test it regularly afterward.[3]
Frequently Asked Questions
What is the best type of detector for an RV?
The best choice for most RVs is a combination LP-gas and carbon monoxide detector made specifically for RV use.[2][4][9]
How often should I replace an RV propane and CO detector?
RV safety guidance commonly recommends replacing LP-gas and carbon monoxide detectors about every five years, even if they still appear to work.[3]
Where should an RV propane detector be mounted?
Because propane is heavier than air, the detector should be mounted low on a wall, and forum guidance commonly places it near the sleeping area as part of the overall safety layout.[2][4]
Can I use a home CO alarm in my RV?
A home CO alarm can help with carbon monoxide detection, but it does not replace an RV combo alarm if you also need propane detection.[2][6][9]
How do I know if my detector is bad?
If it is chirping, failing a test, or past its replacement age, replace it rather than trusting it.[3][7]
Bottom line for buyers
If you want one detector that makes sense for most rigs, buy a hardwired RV combination LP-gas and CO alarm that fits your cutout, mounts in the correct low-wall location, and is within its service life.[2][3][9] That is the no-drama, real-world answer—everything else is secondary to proper fit, proper placement, and timely replacement.
All Picks & Comparison
| # | Product | Price | Rating | ||
|---|---|---|---|---|---|
| #1 |  |
Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL |
$58.02 | (2,329) | View on Amazon |
| #2 |  |
Safe-T-Alert by MTI Industries 35-742-BR 35 Series Dual LP/CO Alarm - Flush Mount, Brown |
$61.13 | (943) | View on Amazon |
| #3 |  |
Safe T Alert - Mini Dual LP/CO Alarm - Flush Mount Black - 25-742-BL |
$75.91 | (97) | View on Amazon |
| #4 |  |
Safe T Alert 25 Series Mini Dual LP/CO Alarm - Propane and Carbon Monoxide Alarm - Surface Mount, Black - 25-741-BL |
— | (55) | View on Amazon |
| #5 | |
RV Dual LP/CO Alarm, RV Carbon Monoxide & Propane Detector, Hardwired-12V DC with 3 Different Brackets for Motorhome Travel Trailer, Motor Coach, Truck Camper (R502 White) |
$49.99 | (54) | View on Amazon |