A precaution and perhaps a life saver.,
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This review is from: Kidde 900-0233 BSI Battery Carbon Monoxide Alarm (DIY & Tools)
I bought three of these, confident that my new system is safe and so far this has been confirmed. I have installed them in locations mostly used by my family. It is heartbreaking to hear of families being killed while sleeping by burners giving off carbon monoxide (CO). You may even be affected by other people poorly maintained burners or CH systems.
Installing a CO monitor is so sensible and this one is OK. It has a self-test button while the higher models even have a CO level log with a digital read-out to give even more data.