I'm sure the good folks of TZ can help me with this quandary...
I have a four storey town house with mains powered smoke detectors on each floor, so mains wiring to the detectors is already in place. They're 20 years old now and I should change them (although they do still work), but I'm wondering whether there's any advantage to having mains powered detectors these days?
You can get 10 year battery detectors that are a lot cheaper than the mains ones. Would these be okay, or is there a good reason to stump up for the mains one? Presumably mains + battery backup is the optimum?
Any advice gratefully received, if I can spend a little less and still keep the family safe then that would be nice...
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