Nest Protect Smoke + CO Alarm review
Test score %
The Nest Protect Smoke + CO Alarm can send alerts about dangerous levels of carbon monoxide or smoke direct to your smartphone, which is a handy touch if you’re out of the house at the time. This more advanced two-in-one functionality, along with its 10-year lifespan, pushes the price up far above the price of a standard CO alarm – but is it an investment worth making? We put the Nest Protect Smoke + CO Alarm through a series of stringent carbon monoxide safety detection tests to find out.
- Pros and cons
Technical specifications
Test results
The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.
Find out how we test carbon monoxide detectorsPut us to the test
Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.
Make smarter choices
Put us to the test
Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.
Suggested alternatives
Related articles
How to choose a carbon monoxide detector
How to choose an effective carbon monoxide detector that you can trust - find out about the different types and how to choose a safe, user-friendly model.
How to install and test carbon monoxide detectors
Ensure your own and your family's safety by installing carbon monoxide alarms correctly. Our Which? experts reveal the right place to fit carbon monoxide alarms to ensure they stand the best chance of detecting killer CO gas.
Carbon monoxide symptoms
The key carbon monoxide symptoms explained. Find out the tell-tale carbon monoxide symptoms and what to do if you think there's a carbon monoxide leak.