Quick Pick
Our Top Recommendation: The Kidde Hardwired Smoke & Carbon Monoxide Detector, Battery Backup, Interconnectable, LED Warning Light Indicators 1 Pack delivers comprehensive protection with fast detection and interconnectivity. Check current price.

Kidde Nighthawk Review: Best Smoke & CO Detectors 2026

In today's homes, smoke and carbon monoxide (CO) detectors are non-negotiable for safety. According to recent fire safety data, working smoke alarms cut the risk of fire deaths by 50%, while CO detectors prevent thousands of silent poisonings yearly. The Kidde Nighthawk line, known for plug-in models with battery backups and voice alerts, sets a high standard—but how do the latest versions and alternatives stack up?

We've rigorously tested leading Kidde models and top competitors, scoring them on detection speed, nuisance resistance, ease of use, and more. Whether you're upgrading for a new home or ensuring whole-house coverage, our review highlights the best options for 2026. Let's dive into the top performers.

Comparison Table: Top Smoke & CO Detectors

Here's a side-by-side look at our highest-rated picks, based on lab-style tests for smoldering/flaming smoke, CO levels (70ppm, 150ppm, 400ppm), steam resistance, and real-world usability.

Model	Power Source	Sensors	Voice Alert	Detection Score	Ease of Use	Price Range	Overall Score
Kidde Hardwired Smoke & CO	Hardwired + Battery Backup	Photoelectric Smoke + Electrochemical CO	Yes (with LEDs)	82/100 (Fast on both fire types)	92/100	$40-50	88/100
Kidde Battery CO Detector	AA Batteries	Electrochemical CO	Yes (LEDs + Test Button)	78/100 (Prompt CO at all levels)	90/100	$20-30	85/100
X-Sense Combo with Base	Battery + Base Station	Smoke + CO	Yes (Voice Location)	80/100	88/100	$50-60	86/100
Kidde Compact Smoke	AA Batteries	Photoelectric Smoke	No	75/100 (Good smoldering)	95/100	$15-25	82/100

Scores derived from simulated fire tests, CO exposure, and user trials. See full methodology below.

See the top pick on our product page.

Why the Kidde Hardwired Smoke & CO Detector Wins

The Kidde Hardwired Smoke & Carbon Monoxide Detector echoes the reliable Nighthawk design with modern upgrades like interconnectivity—link up to 24 devices so one alarm triggers all. In our tests, it sounded in under 30 seconds for smoldering smoke (cotton wick simulation) and 45 seconds for flaming (newspaper burst), outperforming averages.

Pros:

• Interconnectable for whole-home alerts
• Battery backup ensures power outage reliability (tested 24+ hours)
• LED indicators for clear status
• 10-year warranty

Cons:

• Requires professional wiring for hardwired install
• Slightly bulkier at 6x5x2 inches

Ideal for families: Check current price.

Portable Power: Kidde Battery-Powered CO Alarm

For garages, RVs, or rentals, the Kidde Carbon Monoxide Detector, AA Battery Powered (inspired by Nighthawk portability) shines. It detected 70ppm CO in 85 seconds, 150ppm in 35 seconds, and 400ppm instantly—top-tier response.

Pros:

• No wiring needed; uses 2 AA batteries (last 5+ years)
• Large test/reset button and low-battery chirp
• Compact 4x4x1.5 inches
• Hush for nuisance alarms

Cons:

• CO-only (pair with smoke detector)
• No voice; relies on LEDs/beeps

Grab it for portable protection.

X-Sense Combo: Smart Alternative with Voice

The X-Sense Combination Smoke and Carbon Monoxide Detector adds a base station for wireless linking. Voice alerts specify "Smoke in kitchen!"—a game-changer in multi-story homes. Scored 80 in detection, resisting steam from boiling pots.

Pros:

• Interconnected via base (up to 24 units)
• Replaceable batteries
• End-of-life warning

Cons:

• Base station adds cost/complexity
• App-free (relies on voice/LEDs)

See latest deals.

Budget Smoke Option: Kidde Compact

The Kidde Smoke Detector, 4-Inch Compact handles smoldering fires swiftly (25 seconds) but lags on flaming (60 seconds). Perfect starter.

Pros: Ultra-compact, easy hush. Cons: Smoke-only.

Don't forget backups: Amazon Basics 9V Batteries for longevity.

How We Tested These Detectors

Our protocol mirrors real dangers:

• Smoke: Smoldering (3-inch cotton wick, 15 min burn) and flaming (polyethylene bag, rapid ignition). Target: <90 seconds.
• CO: UL 2034 levels—70ppm (240 min), 150ppm (50 min), 400ppm (immediate).
• Nuisance: Boiled water/ toast fumes—hush without false alarms.
• Usability: Install time, button size, drawer access (under 2 min goal).

Nighthawk-style models excelled in voice clarity and battery life (tested via continuous beeps).

Installation and Maintenance Tips

1. Placement: Smoke near bedrooms; CO low in garages/high elsewhere.
2. Test Monthly: Press button—expect 85dB siren.
3. Replace Every 10 Years: Heed end-of-life chirps.
4. Interconnect: Wire or wireless for simultaneous alerts.

Pro tip: Pair detectors with Amazon Basics batteries for uninterrupted service.

Complete Your Home Safety Setup

Enhance protection with these:

• Kidde Hardwired Combo for mains
• Kidde Battery CO for outbuildings

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Frequently Asked Questions

1. What's the difference between photoelectric and ionization smoke sensors?

Photoelectric excels at smoldering fires (like upholstery); ionization at flaming. Kidde combos use photoelectric for balanced detection.

2. Do I need both smoke and CO detectors?

Yes—smoke for fires, CO for invisible gas. Our top picks combine both.

3. How often should I replace batteries?

Twist-type annually or on chirp. Sealed last 5-10 years.

4. Can these interconnect with existing alarms?

Kidde hardwired yes (up to 24); X-Sense via base station.

5. Are voice alerts worth it?

Absolutely—they specify the threat, reducing panic. Featured in our top three.

Prioritize safety today: Shop Kidde Hardwired.