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Yes, and this matters more in an RV than almost anywhere else. Most RVs already ship with a built-in carbon monoxide detector, wired in to watch the furnace and generator. That factory detector may not be positioned to also cover a portable propane heater added into the mix later, so check its placement rather than assuming you are automatically covered.
Why RVs Usually Already Have One
Building codes for RV makers typically require a carbon monoxide detector as standard equipment. This is tied to having a propane furnace, generator, or other fuel-burning system on board. It is a good baseline. But it was designed around the RV’s original built-in appliances, not a portable heater brought in later.
Where the Built-In Detector May Fall Short
A factory detector usually sits near the furnace or sleeping area. That follows the RV’s original equipment layout. Run a portable propane heater somewhere else, like a slide-out or a separate sitting area, and that built-in detector may not sense a problem fast enough. A portable, battery-backed detector placed near the heater itself closes that gap.
Testing the One You Already Have
Test the built-in detector’s function button at the start of each camping season. Replace it on the schedule the maker states. These units do expire. They can stop reliably sensing gas after a few years, even if the alarm sound still works during a button test.
Adding a Portable Detector
A small, battery-backed portable carbon monoxide detector is inexpensive and easy to pack alongside a portable heater, and it travels with the heater to wherever it is actually running inside the RV. Our carbon monoxide detector roundup covers compact options suited to RV use.
The Bottom Line
Yes, a carbon monoxide detector is essential in an RV running a propane heater. The one already built in is a good baseline, but check its placement and add a portable unit near wherever a portable heater actually runs, rather than assuming the factory detector alone has it covered.