I was surprised that in the winter, on a cold still day, cooking a Sunday Lunch, with all the stoves burners on, and the oven as well, can sometimes get the reading of 35. On our house CO detector, if it stays above 30 for more than an hour, it sets the alarm off. Has only done it a couple of times, but definitely sets the heart going trying to work out what it is.
What is nice, is it keeps the maximum it has reached since you last reset it, so you can turn things off, air the house, reset it, and then turn things on, and see what sends it up, but we know in our house that is normally sits at about 13, so if it goes above that, we need to start checking stuff out.
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