Head-to-head · Best Carbon Monoxide Detectors

Kidde Hardwired Smart Smoke and Carbon Monoxide Detector vs Kidde Smoke and Carbon Monoxide Detector

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Kidde Hardwired Smart Smoke and Carbon Monoxide Detector comes out ahead by a narrow margin (4.5 vs unrated). The gap is mostly about Users prioritizing traditional safety — read the strengths below before deciding.

Higher ratedRanked #1 in Best Carbon Monoxide Detectors

Kidde Hardwired Smart Smoke and Carbon Monoxide Detector

4.5

3 sourcesall derived$74.97as of Aug 1

The Kidde Hardwired Smart Smoke and Carbon Monoxide Detector pairs a 10-year battery life with detection technology rated 25% faster and 3X more precise than average smoke alarms. TechHive reviewer Christopher Null found performance reliable and liked the interconnect capabilities, but noted the absence of smart home integration and a price that's steep for a non-smart model. Voice alerts are built in, and up to 24 devices can be interconnected, though wiring it up takes some basic knowledge. It fits buyers who put traditional safety features ahead of smart connectivity.

Strengths

— 10-year lifespan with non-removable battery
— Fast smoke detection (25% faster than average)
— 3X more precise smoke detection than average

Watch-outs

— Smart home connectivity requires stepping up to the separate Ring-enabled version
— Busy design that juts out 2 inches from wall/ceiling
— High price for model without smart features

$74.97 · Check Price on Amazon Full review →

Ranked #5 in Best Carbon Monoxide Detectors

Kidde Smoke and Carbon Monoxide Detector

UnratedNo cited reviews$106as of Aug 1

Kidde's dual smoke and carbon monoxide alarm is a hardwired detector with a 10-year battery sealed inside, so the only maintenance is the annual test. Detection is reliable and the notifications useful, but the smart-home side is thin next to alarms built around a full platform.

Strengths

— Smart alerts with smartphone notifications
— Easy installation and setup
— Long battery life with low-battery warnings

Watch-outs

— Limited smart home integration with only basic automation support
— No built-in siren override for testing

$106 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Kidde Hardwired Smart Smoke and Carbon Monoxide Detector

The Kidde hardwired model surpasses the SC5 in detection speed and precision, offering 25% faster smoke detection and 3X more accurate readings, while the SC5 lacks these performance advantages. Unlike the basic First Alert detector, it provides advanced interconnect features for up to 24 devices, though it lacks smart home integration. The Klein ET110 offers more professional-grade features, but the Kidde model provides the most robust traditional safety features.

Kidde Smoke and Carbon Monoxide Detector

The Kidde Ring Smart Alarm provides smartphone notifications and easy setup, but lacks the advanced interconnect features of the hardwired model. Unlike the First Alert SC5, it offers only basic automation support and no Wi-Fi connectivity, making it a middle-ground option between basic and smart models. While the Klein ET110 provides professional-grade accuracy, the Kidde model focuses on simplicity and reliability.

Specs side-by-side

Spec	Kidde Hardwired Smart Smoke and Carbon Monoxide Detector	Kidde Smoke and Carbon Monoxide Detector
Detection Type	Dual Sensor	Smoke and Carbon Monoxide
Power Source	Hardwired	Hardwired with 10-year integrated battery
Battery Life	10 years	10 years
Connectivity	Wi-Fi, Ring App, Amazon Alexa, Google Home	Wi-Fi
Display	LED indicator	LED status lights
Features	Voice alerts, false alarm reduction	Voice alerts, interconnectable, LED indicator
Alarm Thresholds	85 dB	85 dB
Dimensions	2"D x 5"W x 5"H	1.88"D x 5"W x 5"H

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