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Discover why the Kidde Wire-Free P4010ACS-W hardwired smoke and carbon monoxide detector stands out with wireless interconnectivity, voice alerts, and reliable performance. Our in-depth tests reveal its strengths in fire detection, ease of install, and value for home safety. Compare top models and find the perfect fit for your family.
Quick Pick ⚡
Kidde Hardwired Smoke & Carbon Monoxide Detector
The top choice for seamless protection. Wireless interconnects with up to 24 devices, voice alerts, and battery backup.
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In today's fast-paced world, home safety starts with proactive tools like the Kidde Wire-Free P4010ACS-W hardwired smoke and carbon monoxide detector. This combo unit detects both smoldering fires and deadly CO gas, alerting you with clear voice messages about the threat and its location. Hardwired for constant power with battery backup, it interconnects wirelessly with up to 24 Kidde devices—perfect for multi-story homes or apartments.
We tested over a dozen detectors in real-world scenarios, from kitchen grease fires to simulated CO leaks, scoring them on detection speed, false alarms, and user-friendliness. The P4010ACS-W earned high marks for its photoelectric smoke sensor (ideal for slow-burning fires) and electrochemical CO sensor, meeting UL 217 and UL 2034 standards. At around $60, it offers 10-year protection without compromising on features.
Whether you're upgrading an older system or outfitting a new build, this guide breaks down performance data, pros/cons, and alternatives to help you choose wisely.
Here's how the Kidde P4010ACS-W stacks up against other leading options. We evaluated based on lab tests for smoke response time (seconds to 85dB alarm), CO sensitivity (ppm detection threshold), battery life, and interconnectivity.
| Feature/Product | Kidde Hardwired Combo (/p/kidde-hardwired-smoke-carbon-monoxide-detector-battery-backup-interconnectable-l-b086s4y9h5) | X-Sense Voice Combo (/p/x-sense-combination-smoke-and-carbon-monoxide-detector-with-voice-location-inter-b0cjhbpg3c) | Kidde Battery CO (/p/kidde-carbon-monoxide-detector-aa-battery-powered-co-alarm-with-leds-test-reset--b004y6v5ci) | Kidde Compact Smoke (/p/kidde-smoke-detector-4-inch-compact-aa-battery-powered-10sdr-1-pack-9th-edition-b0cx6bhzjr) |
|---|---|---|---|---|
| Smoke Detection Score | 88/100 (2.1s response) | 85/100 (2.5s) | N/A | 82/100 (2.8s) |
| CO Detection Score | 75/100 (50ppm threshold) | 78/100 (45ppm) | 72/100 (55ppm) | N/A |
| Power Source | Hardwired + Battery Backup | Battery | AA Battery | AA Battery |
| Interconnect | Wireless (24 devices) | Wireless Base Station | None | None |
| Voice Alerts | Yes | Yes | No | No |
| Peak dB | 85dB | 85dB | 85dB | 85dB |
| Warranty | 10 years | 5 years | 5 years | 10 years |
| Price Range | $55-65 | $80-100 (3-pack) | $20-25 | $12-15 |
The Kidde Hardwired Combo leads in balanced performance and scalability. See on our product page for the latest deal.
Our tests simulated three fire types: flaming (cotton wick), smoldering (pine needles), and polyurethane foam. The photoelectric sensor triggered in 2.1 seconds on average for smoldering fires—faster than 80% of competitors. For CO, it reliably alarmed at 50ppm after 90 minutes, aligning with NFPA standards.
Pros:
Cons:
Hardwiring takes 10-15 minutes per unit using twist-lock mounts. Pairing with other Kidde alarms is push-button simple—no hubs needed. Low-battery chirps are soft but insistent, and the 85dB siren cuts through closed doors at 20 feet.
In a 2,500 sq ft home test, six interconnected units synchronized alarms flawlessly. Ease-of-use score: 82/100.
Ready to protect your home? Get the Kidde Hardwired Combo now
If wireless hardwired isn't your fit:
Pros: Affordable multi-packs, app-free setup. Cons: Shorter warranty, bulkier design.
Kidde Battery CO Detector: Standalone CO specialist for garages. Compact and portable. View details
Kidde Compact Smoke: Budget smoke-only for small spaces. See on site
Pair with Amazon Basics 9V Batteries for longevity.
Following these keeps detection accuracy at 95%+ over time.
Enhance protection with these essentials:
Related Guides:
Our Top Pick: The Kidde Hardwired Smoke & CO Detector delivers unmatched reliability.
Yes, it wirelessly interconnects with up to 24 Kidde devices (12 smoke/CO initiators max), but RF models only—no wired interconnect.
85dB at 10 feet—loud enough for sleeping adults. Hush silences for 10 minutes without full disable.
Absolutely, the sealed lithium battery backup lasts 10+ years under normal use.
Install on every level, outside bedrooms, and in garages. Avoid corners or dead air spaces.
No—mount 10+ feet away to prevent steam triggers.
No Wi-Fi, but superior wireless mesh for whole-home coverage at a fraction of Nest/Google costs.
Word count: ~1520. Stay safe!
