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No. Even an indoor-safe, ODS-equipped heater like a Mr. Heater Buddy isn’t rated by its manufacturer for unattended use while you sleep, and a tent’s small, sealed volume makes this a genuinely higher-risk setup than the same heater in a house or RV.
Why Tents Are a Harder Case Than a Room
A tent typically has far less air volume than even a small bedroom. Modern tents are also built to block wind and retain warmth, which means less natural air exchange than an old, drafty structure. Both factors mean oxygen depletes faster, and any carbon monoxide produced has less air to dilute into, compared to a similarly sized room in a house.
Why an ODS-Equipped Heater Doesn’t Change the Sleep Rule
The Buddy lineup and similar radiant heaters are genuinely indoor-safe by design, with a certified oxygen depletion sensor. That doesn’t extend to unattended overnight use. Manufacturers rate these heaters for use while awake and monitoring the heater, not for running through a full night of sleep. The sensor is a strong safety layer, not a substitute for someone being awake to notice a problem.
Most Campers Don’t Pack a CO Detector
A carbon monoxide detector is standard advice for any fuel-burning heater indoors, but far fewer people pack one for a tent than for a garage or RV. That gap matters, since the detector is the backstop for the exact scenario a sensor doesn’t fully cover. A small battery-powered CO detector is worth adding to a cold-weather camping kit if a propane heater is coming along.
What Manufacturers Actually Recommend
Most portable radiant heater manuals recommend running the heater to warm the tent before sleep, then turning it off rather than leaving it running through the night. This gets the comfort benefit of the heat without the risk of unattended combustion in a sealed space while everyone is asleep.
Safer Ways to Stay Warm Overnight in a Tent
A cold-rated sleeping bag, an insulated sleeping pad, and warming the tent before bed rather than during sleep cover most of the overnight warmth need without running a heater unattended. If genuinely cold-weather camping calls for more heat than that, a heater rated specifically for that use, run only while someone is awake, paired with a CO detector, is the safer approach.
The Bottom Line
Running a propane heater while sleeping in a tent isn’t something manufacturers recommend, even for ODS-equipped models built for camping use. The combination of a small sealed space and no one awake to notice a problem is exactly the scenario this guidance exists to prevent. Warm the tent before sleep, then turn the heater off.