Which is better, Kidde Nighthawk or First Alert CO615?

Based on our trust score analysis, Kidde Nighthawk scores 9.4/10 compared to First Alert CO615 at 9.2/10. Kidde Nighthawk ranks higher across expert reviews, user sentiment, and value metrics, making it the stronger choice overall.

What is the price difference between Kidde Nighthawk and First Alert CO615?

Kidde Nighthawk is priced at $29.00 – $44.00 and First Alert CO615 is priced at $24.00 – $39.00. Kidde Nighthawk is the more expensive option at $29.00 – $44.00, while First Alert CO615 comes in at $24.00 – $39.00.

Is Kidde Nighthawk worth the extra money over First Alert CO615?

Kidde Nighthawk ($29.00 – $44.00) has a value score of 8.6/10 compared to First Alert CO615 ($24.00 – $39.00) at 9.2/10. First Alert CO615 offers better value for money despite the lower price point.

Home / Carbon Monoxide Detectors / Kidde Nighthawk vs First Alert CO615

Kidde Nighthawk vs First Alert CO615

Name: First Alert CO615
Brand: First Alert
Rating: 4.7 (1 reviews)

Head-to-head comparison based on trust scores, features, pricing, and real user feedback.

Our pick: Kidde Nighthawk (Trust Score 9.4 vs 9.2)

Kidde Nighthawk

Kidde

$29.00 – $44.00

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.

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First Alert CO615

First Alert

$24.00 – $39.00

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.

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Score Comparison

Metric	Kidde Nighthawk	First Alert CO615
Trust Score	9.4 ✓	9.2
Expert Score	9.3 ✓	9.1
User Sentiment	9.5 ✓	9.2
Value Score	8.6	9.2 ✓
Complaint Risk	8.5 ✓	8.6
Price	$29.00 – $44.00	$24.00 – $39.00

The Verdict

Kidde Nighthawk wins this comparison with a Trust Score of 9.4 vs 9.2. It's rated "Best Overall" and scores higher across the majority of our evaluation criteria. However, the First Alert CO615 may be a better fit depending on your specific priorities — check the pros and cons above.

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