The 10 Best Smoke & CO Detectors as of June 2026

How we ranked these smoke & co detectors

Each pick earns a score out of 10 from weighted criteria:

Performance (35%) — how well each smoke detector does its core job.
Value (25%) — quality and features for the price.
Build & reliability (20%) — materials, longevity and warranty.
Features (20%) — meaningful extras that improve the experience.

At a glance: top 10 compared

Swipe across to see all columns, including Amazon links →

#	Smoke & CO Detectors	Score	Best for	Type	Approx. Price	Amazon links
1	Google Nest Protect	8.8	Best smart	Smoke + CO (smart)	£100	View Price
2	Aico Ei3024 Multi-Sensor	8.7	Best mains (UK standard)	Smoke + heat (mains)	£60	View Price
3	Google Nest Protect (Wired)	8.6	Best wired smart	Smoke + CO (smart)	£110	View Price
4	Aico Ei3028 Heat + CO	8.5	Best for kitchens	Heat + CO (mains)	£65	View Price
5	FireAngel Pro Connected	8.5	Best interlinked	Smoke (wireless link)	£45	View Price
6	X-Sense Smart Smoke Detector	8.4	Best value smart	Smoke (smart)	£35	View Price
7	FireAngel CO-9X CO Alarm	8.4	Best CO alarm	Carbon monoxide	£20	View Price
8	X-Sense Smart CO Alarm	8.2	Best smart CO	Carbon monoxide (smart)	£45	View Price
9	First Alert Smoke & CO Combo	8.2	Best 2-in-1 budget	Smoke + CO (battery)	£30	View Price
10	Kidde Mains Smoke Alarm	8.1	Best budget mains	Smoke (mains)	£25	View Price

The full ranking

Best smart

Google Nest Protect

8.8Our number one pick.

Google's Nest Protect detects both smoke and carbon monoxide, speaks the warning, sends phone alerts and self-tests, the leading smart detector. It is expensive per unit, but the smart alerts and dual sensing are excellent.

Detection: 9.0Smart features: 9.4Ease: 8.8Value: 8.0

Pros

Smoke and CO in one
Phone alerts and voice
Self-testing

Cons

Expensive
Pricey to cover a house

Check price on Amazon≈ £100

Best mains (UK standard)

Aico Ei3024 Multi-Sensor

8.7A superb runner-up.

Aico's mains-powered multi-sensors are the UK go-to for new-build and landlord compliance, combining optical smoke and heat sensing with interlinking, reliable and standards-compliant. They need wiring, but the reliability is excellent.

Detection: 9.2Smart features: 8.0Ease: 8.2Value: 8.8

Pros

UK landlord-grade
Optical and heat sensing
Interlinkable

Cons

Needs wiring
Not app-connected

Check price on Amazon≈ £60

Best wired smart

Google Nest Protect (Wired)

8.6Rounds out our top three.

The wired Nest Protect adds mains power to the smart smoke-and-CO detector for continuous operation with battery backup, ideal for whole-home smart coverage. It is pricey, but the features and reliability are excellent.

Detection: 9.0Smart features: 9.4Ease: 8.4Value: 8.0

Pros

Mains with battery backup
Smoke and CO
Smart alerts

Cons

Expensive
Professional wiring

Check price on Amazon≈ £110

Best for kitchens

Aico Ei3028 Heat + CO

8.5A standout in the upper half.

Aico's Ei3028 combines heat and carbon-monoxide sensing for kitchens and boiler rooms where smoke alarms false-trigger, mains-powered and interlinkable to UK standards. It needs wiring, but the targeted sensing is excellent.

Detection: 9.0Smart features: 8.0Ease: 8.2Value: 8.6

Pros

Heat and CO for kitchens
Avoids cooking false alarms
Interlinkable

Cons

Needs wiring
No app

Check price on Amazon≈ £65

Best interlinked

FireAngel Pro Connected

8.5A well-rounded mid-table pick.

FireAngel's Pro Connected alarms wirelessly interlink so they all sound together, with long-life sealed batteries and an optional gateway for app alerts, great for whole-home coverage. The gateway costs extra, but the interlinking and value are excellent.

Detection: 8.8Smart features: 8.4Ease: 8.8Value: 8.8

Pros

Wireless interlinking
10-year sealed battery
Optional app gateway

Cons

Gateway extra for app
Plain design

Check price on Amazon≈ £45

Best value smart

X-Sense Smart Smoke Detector

8.4Great value in the middle of the pack.

X-Sense's smart detectors send phone alerts via a base station and interlink wirelessly at a friendly price, good-value smart coverage. The base station is needed for app features, but for value smart detection it is excellent.

Detection: 8.6Smart features: 8.6Ease: 8.6Value: 9.0

Pros

Affordable smart alerts
Wireless interlinking
Phone notifications

Cons

Base station for app
Smoke-only models

Check price on Amazon≈ £35

Best CO alarm

FireAngel CO-9X CO Alarm

8.4A dependable pick if the price is right.

FireAngel's CO-9X is a dependable standalone carbon-monoxide alarm with a 7-year sensor and clear display, essential near boilers and gas appliances at a low price. It is CO-only and basic, but for value safety it is excellent.

Detection: 8.8Smart features: 7.6Ease: 9.0Value: 9.2

Pros

Reliable CO detection
7-year sensor
Cheap and essential

Cons

CO only
No app

Check price on Amazon≈ £20

Best smart CO

X-Sense Smart CO Alarm

8.2Solid, if outshone by pricier rivals.

X-Sense's smart CO alarm adds phone alerts and interlinking to carbon-monoxide detection, useful for remote warnings while you're away. It needs the base station, but for connected CO safety it is good value.

Detection: 8.6Smart features: 8.6Ease: 8.4Value: 8.6

Pros

Smart CO alerts
Interlinking
Clear display

Cons

Base station needed
Newer brand

Check price on Amazon≈ £45

Best 2-in-1 budget

First Alert Smoke & CO Combo

8.2A budget-friendly option worth a look.

First Alert's combination alarm detects both smoke and carbon monoxide in one battery unit at a low price, simple whole-room protection. It is battery-only and basic, but for value 2-in-1 coverage it is good.

Detection: 8.6Smart features: 7.6Ease: 8.8Value: 9.0

Pros

Smoke and CO in one
Cheap
Easy to fit

Cons

Battery only
No app

Check price on Amazon≈ £30

Best budget mains

Kidde Mains Smoke Alarm

8.1Rounds out our top ten.

Kidde's mains smoke alarms offer dependable optical detection with battery backup at a low price, a sensible budget choice for wired coverage. They are basic and not smart, but for value they are reliable.

Detection: 8.4Smart features: 7.4Ease: 8.4Value: 9.0

Pros

Affordable mains alarm
Battery backup
Reliable

Cons

No smart features
Plain

Check price on Amazon≈ £25

Frequently asked questions

What's the best of the smoke & co detectors in 2026?

Our top overall pick is the Google Nest Protect, which leads on our combined score for performance, value and features. The Aico Ei3024 Multi-Sensor and Google Nest Protect (Wired) are excellent alternatives depending on budget and needs.

How did we choose these?

We weight performance, value, build quality and features, drawing on hands-on use and independent testing. See the methodology box above for the full breakdown.

Are these prices accurate?

Prices are approximate UK figures at the time of writing and change frequently. Click through to Amazon for the current price.

The bottom line

If you just want the best smoke & co detectors without overthinking it, the Google Nest Protect is our top recommendation — it earns the highest overall score for performance, value and features. Have a look at the current price and see what you think.

Check price on Amazon ≈ £100

Our top picks at a glance

Google Nest Protect

X-Sense Smart Smoke Detector

Aico Ei3028 Heat + CO

You might also like

How we ranked these smoke & co detectors

At a glance: top 10 compared

The full ranking

Google Nest Protect

Pros

Cons

Aico Ei3024 Multi-Sensor

Pros

Cons

Google Nest Protect (Wired)

Pros

Cons

Aico Ei3028 Heat + CO

Pros

Cons

FireAngel Pro Connected

Pros

Cons

X-Sense Smart Smoke Detector

Pros

Cons

FireAngel CO-9X CO Alarm

Pros

Cons

X-Sense Smart CO Alarm

Pros

Cons

First Alert Smoke & CO Combo

Pros

Cons

Kidde Mains Smoke Alarm

Pros

Cons

Frequently asked questions

The bottom line

⚖️ Build your own comparison