"Every smart smoke detector I tested had only a photoelectric sensor, which picks up smoldering fires, while ionization sensors that pick up fast-burning fires were left behind. Ionization sensors are more likely to have nuisance alarms go off, but it's still a sensor you should have somewhere in your home."
"A photoelectric-only smoke detector is still a good smoke detector and will pick up smoldering electrical fires in your walls. However, you'll want to make sure there is an ionization sensor or two in your home, more so than needing a Wi-Fi model added."
Smart smoke detectors typically feature only photoelectric sensors, which detect smoldering fires, while omitting ionization sensors that are essential for identifying fast-burning fires. Although smart models can alert homeowners about fires remotely, they do not provide significant advantages over traditional smoke alarms. The absence of ionization sensors poses a risk, especially as modern building materials reduce escape time during fires. It is advisable to have both types of sensors in a home for optimal safety, as dual-sensor smart detectors are currently unavailable.
Read at WIRED
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