The call came at 2 AM. My friend Tom's voice was shaking: “Bill, we almost didn’t wake up.” He and his family had been asleep in their RV when their carbon monoxide detector went off. They’d been running their generator too close to the rig, and deadly CO had been seeping in while they slept. What saved them? A $40 detector they nearly skipped replacing the season before.
Just a week later, I watched firefighters respond to a propane leak at a nearby site. There was no explosion—no flames—just a quiet alert from a propane detector that gave the RV owners enough time to shut everything down. “If that detector hadn’t gone off,” the firefighter said, “we’d be talking about a very different outcome.”
These aren’t rare stories—they’re real, and they happen more often than most RVers realise. After two decades in the RV world, I’ve seen firsthand how vital gas and carbon monoxide detectors are—and how often they’re misunderstood, neglected, or installed incorrectly.
In this guide, I’ll walk you through the key differences between carbon monoxide and propane detectors, how they work, where to install them, and how to maintain them properly. It’s straightforward information—but it could save your life.
Before diving into the specific detectors, let's understand the distinct hazards they're designed to detect.
I like to think of these as the "invisible intruders" in your RV—you can't see them, but they can definitely harm you.
Propane, also called Liquefied Petroleum Gas (LP), is a commonly used fuel in RVs for heating, cooking, refrigeration, and hot water. While propane is an efficient and convenient fuel source, it poses specific risks that make detection crucial:
Carbon monoxide is a byproduct of incomplete combustion of carbon-based fuels, including propane, gasoline, diesel, wood, and charcoal.
CO presents different but equally dangerous risks:
I've personally experienced mild CO poisoning after a faulty exhaust system in an RV I was working on. The headache and dizziness were frightening, and that was from just a brief exposure. Long-term or high-concentration exposure can be fatal.
Now that we understand the distinct threats, let's examine how the detectors differ.
These aren't just technical differences—they're critical distinctions that affect how these devices protect you.
Propane Detectors typically use semiconductor sensors that react to the presence of combustible gases. When propane molecules come into contact with the sensor, they cause a change in electrical resistance that triggers the alarm.
I like to think of propane detectors as "explosion prevention devices"—they're primarily warning you about a gas that could ignite and cause a fire or explosion.
Carbon Monoxide Detectors use different technologies:
CO detectors are more like "poison prevention devices"—they're warning you about a toxic gas that's directly harmful to your body when breathed.
Propane Detectors must be installed low in the RV, typically 4-6 inches from the floor, because propane is heavier than air and collects at the lowest point.
I once inspected an RV where the previous owner had moved the propane detector to eye level "so it would be easier to see." This well-intentioned but dangerous modification meant the detector would only alarm after the room was already filled with enough propane to reach that height—far too late for safety.
Carbon Monoxide Detectors should be installed at eye level or higher (typically 5 feet from the floor) because CO mixes with air throughout the space. Some manufacturers recommend installing them near sleeping areas to ensure alarms will wake occupants.
In my own RV, I have the CO detector mounted on the wall near the bedroom, where it will wake us if it alarms during the night. The propane detector is mounted low in the kitchen area, near the propane appliances.
Propane Detectors typically alarm when gas concentration reaches approximately 10-25% of the Lower Explosive Limit (LEL), well before reaching dangerous explosive concentrations.
This early warning is crucial—it gives you time to shut off the propane, ventilate the RV, and find the source of the leak before the situation becomes truly dangerous.
Carbon Monoxide Detectors have varying alarm thresholds based on concentration and exposure time:
These time-weighted thresholds reflect how CO poisoning works—higher concentrations are dangerous more quickly, while lower concentrations become dangerous with prolonged exposure.
Propane Detectors in RVs are typically hardwired into the 12V DC electrical system, providing continuous protection as long as battery power is available.
This is why it's crucial to maintain your RV batteries even in storage—your propane detector needs power to function, even when you're not using the RV.
Carbon Monoxide Detectors come in both hardwired and battery-powered versions. Many RVers prefer battery-powered CO detectors as a backup in case the RV's electrical system fails.
I actually use both in my RV—a hardwired CO detector that's integrated with the RV systems, plus a battery-powered backup unit. Belt and suspenders, as my grandfather would say.
Gas detectors have a limited life span, and it's very important to change out your detector when it hits that expiration date. You should find the expiration date on the back side of the detector and replace when directed.
Propane Detectors typically have a 5-7 year lifespan before the sensor degrades and requires replacement.
Carbon Monoxide Detectors generally last 5-7 years for hardwired models and 2-3 years for battery-powered units, though this varies by manufacturer.
I mark my calendar with replacement dates and treat them as non-negotiable maintenance items. The $50-100 cost of replacement is insignificant compared to the protection they provide.
Some RV owners mistakenly believe that having one type of detector provides protection against both threats.
This dangerous misconception could have serious consequences:
I've heard too many stories of RVers who thought their propane detector would warn them about generator exhaust, or that their CO detector would alert them to propane leaks. This misunderstanding can be fatal.
Over the years, I’ve installed, tested, and helped troubleshoot a wide range of gas and carbon monoxide detectors in RVs. While there are plenty of options out there, a few have consistently proven reliable, easy to install, and well-suited to RV life.
If you're replacing an older propane detector or installing one for the first time, I highly recommend the Safe-T-Alert 40-442-P-WT 40 Series Propane/LP Gas Detector. This flush-mount model integrates cleanly with most RV interiors and includes advanced features like:
I’ve used this model in my own rig and appreciated the factory-installed look. Just note that it requires a cutout in the wall or cabinetry, so it’s best for replacements or planned remodels.
If you’d prefer something easier to install, take a look at the MTI Industries 30-441-P-WT Classic 30 Series Propane Detector. This surface-mount version offers:
I’ve recommended this detector to countless RVers doing DIY upgrades. It’s slightly more visible on the wall, but the ease of installation makes it well worth it.
When it comes to carbon monoxide protection, there are two options I consistently trust:
MTI Industries SA-339 Safe-T-Alert CO Detector
A compact, sealed-battery detector designed specifically for RVs.
BRK Electronics Carbon Monoxide Detector
A residential-grade model adapted for RV use.
Each of these detectors serves a specific purpose, but together they create a layered safety system that protects you from both propane leaks and invisible carbon monoxide buildup.
Whether you're upgrading old devices or outfitting a new RV, these are the models I trust to keep my own family safe on the road.
For maximum protection, follow these installation guidelines that I've developed after years of RV safety experience:
Regular maintenance ensures your detectors will function properly when needed. This is the step many RVers skip, but it's absolutely crucial:
I've made this a habit whenever I pay my monthly bills—it takes less than a minute per detector but provides crucial peace of mind.
I do this every spring as part of my dewinterization process, ensuring my safety systems are ready for the camping season ahead.
Mark your calendar or set phone reminders for detector replacement:
I've seen too many RVers ignore these expiration dates, not realizing that the sensors degrade over time and may not detect dangerous conditions even if the unit powers on.
Knowing how to respond to detector alarms can save lives. These aren't just theoretical guidelines—they're actions that have saved real RVers in real emergencies:
A friend of mine ignored a CO alarm, assuming it was malfunctioning because he "felt fine."
Within 30 minutes, he developed a severe headache and dizziness—early symptoms of CO poisoning. Fortunately, he evacuated in time, but his experience demonstrates how quickly CO can affect you.
Understanding what typically triggers alarms can help prevent dangerous situations before they occur:
The distinction between propane gas detectors and carbon monoxide detectors is not merely technical—it's a matter of life safety. These devices protect against different but equally dangerous threats, and both are essential components of a comprehensive RV safety system.
I've seen firsthand how these simple devices have saved lives. The family whose carbon monoxide detector woke them before levels became lethal. The couple whose propane detector alerted them to a leak from a damaged regulator before it could cause an explosion. These aren't dramatic stories I've made up—they're real experiences from real RVers I've known.
By understanding the differences between these detectors, installing them correctly, and maintaining them properly, you create multiple layers of protection for yourself and your loved ones. The modest investment in quality detectors like the Safe-T-Alert 40-442-P-WT Propane Detector and MTI Industries SA-339 Carbon Monoxide Detector provides invaluable peace of mind during your RV adventures.
Remember that gas detectors have a limited life span, and it's very important to change out your detector when it hits that expiration date. You should find the expiration date on the back side of the detector and replace when directed. This simple maintenance task could literally save your life.
I'll leave you with this thought: In twenty years in the RV industry, I've never met anyone who regretted installing and maintaining proper safety equipment. But I have, unfortunately, met people who regretted not doing so. Don't let that be your story.
I’m Bill Rowell, the founder of RVupgrades.com. In 2002, I launched the business to help fellow RV enthusiasts find unique and hard-to-find products. Over the years, it’s grown to offer more than 15,000 items, with a warehouse in Eastlake, Ohio. Having owned and repaired nearly every type of RV, I bring over two decades of hands-on experience to the table. For me, this isn’t just a business—it’s a passion and a way of life that I love sharing with the RV community.
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