Kidde Nighthawk vs First Alert CO615
Compare features and trade-offs. Catalog scores are editorial assessments, not customer review averages or proof of hands-on testing.
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Higher catalog score: Kidde Nighthawk (Trust Score 9.4 vs 9.2)
9.4
Excellent
Best Overall
Pros
- +Digital display shows CO levels
- +Battery backup for outages
- +Peak level memory
Cons
- −Plug-in requires outlet placement
- −No smart home connectivity
Don't buy if
- ⚠ The battery backup uses AA batteries that must be replaced annually; the detector will chirp incessantly when backup batteries are low.
9.2
Excellent
Runner-Up
Pros
- +Flexible plug-in or tabletop placement
- +UL 2034 certified
- +Digital CO level readout
Cons
- −Battery backup requires replacement
- −Basic design without smart features
Don't buy if
- ⚠ Place the detector at knee height near sleeping areas, not in the kitchen or garage where combustion byproducts may cause false readings.