Is the CarbonOne Safe really 4-in-1 or just CO and smoke?

The gas detection part is the main reason I grabbed one for my kitchen. I’ve had it about eight months now and it’s gone off twice when my wife was cooking with the gas stove and something boiled over. Both times it picked up the gas before the smoke alarm even thought about chirping, which kind of surprised me because I figured the smoke sensor would be the first to react. I can’t prove it would catch a slow leak from a pipe or anything like that, but for everyday cooking mishaps it’s definitely doing something on the gas side, not just sitting there pretending. Whether it’s as sensitive as a dedicated gas alarm, no clue, but it’s not dead weight in that department like I half expected when I bought it. The plug-in thing is handy too since I didn’t have to mess with wiring, and the little screen showing numbers is weirdly satisfying. So yeah, I’d say the 4-in-1 claim has held up in my experience, at least for the propane and gas side.

I kind of expected the gas part to be mostly label decoration when I first saw one of these, but that’s not really what bugged me. What bugged me is that people treat “4-in-1” like it means all four things work equally well. It doesn’t. The CO side is the part that actually has a real sensor behind it. The natural gas and propane side is more of a general air quality sniffing thing from what I can tell, and placement matters way more than the box lets on.

I had a plug-in combo unit before this one, different brand, and it sat in a hallway outlet for like a year. Never made a peep. Then I moved it into the kitchen near the stove and it started chirping at me every time I cooked with the burner on high for a while. Nothing was actually leaking. It was just steam and cooking junk confusing it. That told me the gas detection is real enough to react to stuff, but not smart enough to know the difference between a hazard and dinner.

So my take is the gas sensors exist, but I wouldn’t buy it thinking you’re getting a dedicated gas alarm packed in for free. If you mainly want CO and smoke coverage with the gas thing as a bonus, fine. If natural gas is your actual worry, that’s a different purchase.

The gas side isn’t fake, but I wouldn’t call it 4-in-1 in any meaningful sense. Mine has been plugged in near the furnace for about a year and a half and it has never once gone off for gas, even when my wife left a burner on low for a solid twenty minutes and the whole place smelled like it. That tells me the sensor is either real picky about concentration or it just isn’t tuned for slow leaks. It does read CO just fine, caught a bad reading once when the flue was acting up. So the CO and smoke part is doing its job. The gas part is there, technically, but I wouldn’t trust it as my only line of defense in a kitchen. If you actually want gas coverage, get a proper alarm for that and let this thing handle the other stuff.

I actually disagree with the idea that the gas side is just marketing. My parents have one in their kitchen and it did react when their propane line had a tiny leak, so the sensor isn’t fake. That said I doubt it’s as reliable as a dedicated alarm if gas detection is your main worry.

The gas detection isn’t marketing, but I don’t think it’s a strong point either. Mine sits in the utility room and it has only ever gone off from dust burning off the furnace, never gas. If gas is the main reason you’re buying it, I’d get a dedicated alarm for that.

I’ve had mine in the kitchen for close to two years and it has picked up a faint gas smell near the stove twice, so the gas sensor isn’t just for show. For me the real selling point is having one plug-in unit instead of three separate gadgets cluttering up the wall. I’d still keep a basic smoke alarm up, but for everyday kitchen coverage it’s been handy.

I’ve had mine for about a year and the only gas it’s ever flagged was from a stuck burner knob, nothing else. So the natural gas and propane detection does work, but it’s not like it’s sniffing out every little thing in the kitchen. If that’s the main reason you’re buying it, I’d probably look at a dedicated gas alarm instead.